Specification Siuri Camp Construction

Siuri Khola Small Hydropower Project Specifications Employer’s Camp Facilities

Nyadi Group (p) Ltd SP-1

1 GENERAL

1.1 Scope of Work

The work to be included covers the supply of all labour, materials and plants and the performance of all works necessary for the construction of the employer's camp facilities including utility works, such as internal water supply system, drainage, sanitation and sewerage system, soak pits, electrical appliances etc. complete in accordance with the drawings, specification and any others that may further be directed by the Employer.

1.2 General

1. Preparing and cleaning the Site: The Site described and shown on the plans plus 6 M (20ft.) all around the building shall be cleared of all obstructions, loose stones and materials, rubbish of all kinds as well as brushwood. All holes or hollows whether originally existing or produced by removal of loose stone or brushwood shall be carefully filled up with earth, well rammed and levelled off as directed. Also the Contractor shall dress the Site 6 M (20ft.) all around the buildings after completions, maximum cutting or filling being 30cm (12 inches). This shall be as directed by the Employer.

2. Work Schedule: Upon signing of the Contract Agreement and within one week from the date, the contractor shall submit a work schedule indicating all the activities in their correct order. The activities shall be broken down to a resolution of one week’s duration or less. The activities shall all be appropriately numbered for reference purpose.

3. Working drawings: Before commencing any work, the Contractor shall prepare and submit to the Employer for approval, two copies of working drawing, a site fabrication or shop drawing based on the drawing issued by the Employer. These drawings shall be submitted at least one week before the actual execution of the works.

4. As-built drawing: The contractor shall submit the two copies of as-built drawings one week after the completion of works. Such as-built drawings shall incorporate all the changes and modifications done in the site during construction.

5. Competency of employed personnel: All building construction and finishing work shall be performed by specialists and experienced personnel. The Employer may require proof of competency of any tradesman or specialist employed on the work.

6. Temporary barricades and safety: The Contractor shall erect temporary barricades as required to safe conduct of his work and to others. The Contractor shall furnish, erect, and maintain for duration of work as required all scaffolds, runways, guard rails, platforms and similar temporary constructions as may be necessary for the performance of the Contract. Such facilities shall be of type and arrangement as required for their specific use; shall be substantially constructed throughout, strongly supported, and well secured; and shall comply with all applicable laws and regulations.

Temporary facilities, barricades, storage shades, tools, materials, plant, apparatus, and debris shall be removed from the site prior to the completion of the work.

7. Approval of material and workmanship: The Contractor shall submit to the Employer for his approval, samples of materials with specimens of workmanship colour and finish for all items described in this Specification as 'approved' at least 15 days to the date he wishes to place or confirm orders.

8. Provison for the installation: In all wall and ceiling finishes the Contractor shall make necessary provision for the installation of pipes, metal frames for windows, electricity conduit, electric wiring, lighting fittings and other fixtures, and after installation of these to the satisfaction of the Employer shall neatly finish the surfaces around them to confirm to the surrounding wall or ceiling finishes. Where required in suspended ceiling, access openings shall be neatly finished at edges by the Contractor, and panels with surfaces corresponding to the ceiling finish shall be fabricated by the Contractor and fitted into the openings in such a manner as to blend with the ceilings.



9. Trail Panels: Where walls, floors or ceilings are to receive a plastered, tiled or painted finish, the Employer may direct that trial panels, approximately 1 m2, be erected in the locations where the particular types of finish are required. The trial panels will be required to indicate the final appearance of the alternative types of finish which may be required at a particular location.

10. Payment of this clause: Payment for the work described in this Clause shall be included in the applicable unit prices tendered in the Bill of Quantities for the relevant items of work. No separate payment will be made for providing samples of materials and trial panel.

11. Damaged components: All damaged components shall be replaced or repaired as directed by the Employer and the Contractor shall submit, for approval, details of the protective measures he proposes to use.

2 EARTHWORK 1. Specification for earthwork will generally refer to open excavation of foundation, tank, drainage, channel

etc. wet or dry, including surface preparation.

2. Site Clearance: The site on which the earthwork is to be carried out and the area required for setting out and other operations should be cleared and all obstructions, loose stones, materials and rubbish of all kinds, sumps, brush wood and trees removed as directed, roots being entirely grubbed up. The materials obtained will be the property of the Employer. The materials pronounced useful by the Employer will be preserved and properly stacked as directed within the specified lead. Useless materials will be disposed off as directed by the Employer.

3. Excavation: Foundation excavation shall include removal of all materials of whatever nature, whether wet or dry; necessary for the construction of foundation and substructure exactly in accordance with the instruction of the Employer. Unless there is a specific extra provision in the contract for shoring or cutting of slopes, contractor shall at his own expense do the necessary shoring or cutting of slopes to a safe angle or both as approved by the Employer when such treatment is needed.

4. The contractor shall notify the Employer before starting excavation to enable him to take Cross-Sectional level for purposes of measurements before the ground is disturbed.

5. If excavation is made deeper than shown on the plan or as ordered by the Employer, extra depth shall be made up with concrete or masonry of foundation grade as directed by the Employer and at the cost of the contractor. After each excavation is completed the contractor shall notify the Employer to that effect and no foundation will be allowed to be laid until the Employer has approved the depth and dimensions of excavation and nature of the foundation material and until the levels and measurements are recorded.

6. Shoring: Unless separately provided for in the contract, excavation of slopes to prevent falling in of sides or providing, fixing, maintaining and removing shoring, bracing etc. shall not be paid for. The contractor shall be responsible for the design of shoring for the exacavation to be properly upheld. Shoring shall be of sufficient strength to resist side pressure and ensure safety from slips and blows and to prevent damage to work and property and injury to persons. It shall be removed after its purpose is fulfilled.

7. Protection: Adequate protection measures shall be taken to see that foundation excavation does not affect or damage adjoining structures. All measures required for the safety of the excavation and the people working in and near the foundation trenches, property and the people in the vicinity shall be taken by the contractor at his own cost. The contractor shall be entirely responsible for any injury to life and damage to property caused by his negligence or accident due to his constructional operations.

8. Disposal of excavated materials: No materials excavated from foundation trenches of whatever kind they may be, are to be placed even temporarily nearer than 1.0 m, or greater distance prescribed from the Employer from the outer edge of the excavation. All excavated materials will be the property of the Employer. Rate of excavation includes sorting out of useful materials and stacking them separately as directed within the specified lead. Materials suitable and useful for back filling or other use shall be stacked in convenient places but not in such a way as to obstruct free movement of men, animals and vehicles or encroach on areas intended for constructional purposes. It shall be used to the extent required to completely backfill the structure to original ground or level or elevation shown on the plans or as



directed by the Employer. For backfilling, the materials shall be placed in 15 cm to 20 cm layers, moistened and well compacted. Materials not useful in any way shall be disposed of as directed by the Employer. The site shall be left clean of all debris on completion.

9. Dewatering: Unless separately provided for as a separate item in the contract, the excavation rate shall include hoisting or pumping out all water which may accumulate in the excavation during the progress of the work either from seepage, springs, rain or any other causes and diverting surface flow if any, by bunds or other means. The bunds shall be removed after their purpose is served.

Pumping out water from any foundation enclosure or trenches shall be generally in such a manner as to pre-clude the possibility of any damage to the adjacent structure. The excavation shall be kept free from water i) during inspection and measurement, ii) when concrete and/or masonry are in progress and till they come above the natural water level and, iii) till the Employer considers that the mortar is sufficiently set.

10. Backfilling: All timber shoring and formwork shall be removed after their necessity ceases and trash of any sort shall be cleaned out from the excavation. All space between foundation masonry or concrete and the sides of excavation must be refilled to the original surface with approved materials, in layers of 15 cm to 20 cm in thickness watered and rammed.

Backfilling shall be carried out after concrete or masonry is fully set and done in such a way as not to cause undue thrust on any part of the structure. Where suitable excavated materials are to used for refilling, it shall be brought from the place where it was temporarily deposited and used in refilling. Earthfilling for built-up floor construction shall be carried out by placing earth in 15 cm to 20 cm layers, moistened and well compacted by using rollers or as instructed by the Employer.

11. Measurement and Payment: Payment shall be made at the unit contract rate per cubic metre for the quantity acceptable excavated, limited to the dimensions shown in the drawings or as directed by the Employer. In case of filling, measurement shall be done in cubic metres of compacted earth. The rate shall include filling, watering and compacting of the earth, entirely for to the satisfaction of the Employer.

3 MASONRY WORK

3.1 Brick Masonry Work

1. Bricks: Bricks shall be oil or sand molded or of quality approved by the Employer free from grit and other impurities such as lime, iron, and other deleterious salts. Brick shall be well burned, copper coloured, sound, hard, rectangular with sharp edges, give ringing sound when struck with a mallet and be of uniform size.No brick after 24 hours of immersion in water shall absorb water more than 15% of its weight, brick used shall be best available local bricks. Exposed brick work shall be selected from the lots.

2. Mortars: The mixing shall be done intimately in a mechanical mixer unless hand-mixing is specifically permitted by the Employer. If hand-mixing is done, the operation shall be carried out on a clean watertight platform, cement and sand shall be first mixed dry in the required proportion to obtain a uniform colour and then the mortar shall be mixed for at least two minutes after addition of water. The mortar used for the foundations should be 1:6 and 1:4 above the foundations.

3. The exposed brick work shall be specially selected for uniformity of size, colour and shape. All faces of the bricks shall be truly plane and rectangular, all corners exactly 90 degree and all bricks identical in size. There shall be no cracks or flaws in the bricks. The finished surface shall give a uniform and pleasant appearance. The exposed bricks work shall have 8 mm deep redressed pointing at joints with 1:3 mortar.

4. All loose materials, dirt, and set lumps of mortars on the surface over which the brick work is to be freshly laid shall be removed with a wire brush. All the bricks shall be thoroughly soaked in clean water immediately before use. The surface over which the brick work is to be laid shall be slightly wetted. The first course itself shall be made horizontal by providing enough mortar in the bed joint to fill up any undulations in the bed course. Required quantity of water is mixed in the mixing platform itself and not over the courses.



The joint should be of uniform thickness as specified. There shall be no thorough joints and the lap shall not be less than half the width of the brick, and all the vertical joints are properly filled with mortar. The verticality and horizontally of the courses shall be checked with plumb bob and spirit level respectively. The courses of brick work shall be aligned and care shall be taken to keep the perpendicular. The brick work shall be built in uniform layers, corners and other advanced works shall be racked back. No part of the wall during its construction shall rise more than 1 meter above the general construction level, to avoid unequal settlement, and also improper jointing. Where the masonry of one part has to be delayed the work shall be racked back suitably at an angle not exceeding 45 degrees according to bond and not toothed. Thickness of joints shall not exceed 10mm.

5. Green work shall be protected from rain by suitable covering, Masonry work in cement or composite mortar shall be kept constantly moist on all faces for a minimum period of seven days. The top of the masonry work shall be left flooded with water at the close of the day. During hot weather, all finished or partly completed work shall be covered or wetted in such manner as will prevent rapid drying of the each brick work.

3.2 Stone Masonry Work

Stone Masonry in Cement Mortar

1. Stone for masonry work in mortar shall be clean, hard, non-friable, un-weathered from an approved source. The length of any stone shall not exceed three times its height and breadth shall not exceed 3/4th of thickness of the wall. Spalls not exceeding 2 percentage of the total surface area in plan of the wall may be used in a staggered pattern for filling void/spaces between later stones. Bond stone minimum 10% by volume of stone masonry work shall be provided at the rate of at least one every 1m2 of the proposed face of the wall. The bond stones shall at least be hammer/chisel dressed and their bedding planes with natural bed shall be as nearly as possible at right angles to the direction of load. Minimum dimension of individual stone shall be 100mm. No unbroken of round boulder will be used in masonry works.

2. Cement sand mortar containing 1 part cement: 4 part sand by volume will be acceptable.

3. Proportioning of cement and sand mortar may be done by volume taking a normal bag of cement weighing 50 kg as a standard unit of volume 0.035 cu.m. Measurement of sand may be done by using an approved metal box of size 400 x 250 x 250mm which has the same volume of 0.035 cu.m. When sand used is moist, due allowance for bulkage will be made.

4. Only that much quantity of mortar will be prepared one time as can be consumed within 30 minutes. Any mortar remained unused after 60 minutes of addition of cement will not be allowed for use and will be rejected.

5. Stone shall be thoroughly cleaned before packing. Each stone shall be thoroughly wetted for 3 to 4 hours immediately before use.

6. Stones shall be laid to keep joints and voids to be filled with mortar to a minimum and so that the exposed joints are not less than, but are as nearly as practicable, 10 mm thick. Stones shall be laid principally with horizontal and vertical joints and as parallel and as neatly as possible. The stones shall be laid to bond together throughout the full width of the section. Each stone shall be laid with its natural bed perpendicular to the direction of principle stress. Packing shall not be inserted after the stones have been bedded.

7. All courses will be laid horizontal. All stones will be wetted, and bonded into mortar. Stones should be laid headers and stretchers alternatively. Volume of chips/spalls used for filling will not exceed 15% by volume. It must be ensured that no hollow spaces are left anywhere in the masonry. Bond stones will be provided in every course, at not more than 1500 mm intervals. Thickness of joint will be not more than 25mm.

8. Stone masonry will be cured with water for 7 days.



9. Scaffolding works are to be arranged as necessary to provided safe working access at all the times; the cost of such scaffolding is deemed to be included in the rates entered by the Contractor in the Bill of Quantities.

10. No loads will be permitted on the mortared stone masonry work until it is fully set.

11. Pointing: Pointing, if specified, shall be carried out in cement mortar not leaner than 1:3. The thickness of joints shall not exceed what is prescribed for each type of masonry. In the face works, the raked out joints up to a depth of at least 20mm shall be filled with mortar of specified mix and of required consistency and then shall be well pressed and rubbed smooth.

Dry Rubble Masonry for Retaining Walls

12. This work shall conform to Random Masonry except that:

i. the masonry shall be dry without mortar;

ii. the spaces between large stones shall be filled with spall at tightly as possible; and

iii. the foundations shall be excavated at right angles to the face batter and not horizontally. The beds of the stones shall be laid at right angles to the face better.

13. The height of the weep holes shall be the same as the height of the course in which they are formed. The sides and bottom of the weep holes in the interior shall be made up with stones having fairly plain surface and the channel so formed shall be slabed over with stones not less than 15 cm thick and having a bearing of not less than 15 cm on each side.

Stone Masonry in Mud Mortar

14. The mud should be made of selected earth of tenacious nature so that it sticks and binds bricks. The earth should be soaked in water at least one day before and then worked up with water by labourer treading it, until it is perfectly free from lumps and forms a thick plastic mix. Joints should not exceed ½” thickness. Soaking of stones is not required. Not more than 60cm height of stone masonry should be carried out at one time, and the walls must be truly in plumb and every course shall be truly horizontal.

15. Mud mortar shall be prepared from good earth free from grass, root, gravel, kankar etc. the earth shall be reduced to find powdered state that mixed with sufficient water in a pit. The mix shall be worked up with spaded and feet daily for at least 4 days so as to get a homogeneous mass.

16. The specifications of stone and the stone works shall confirm to the related clauses regarding the cement stone masonry.

17. Measurement, for payable, of furnishing and laying masonry works will be made to the neat lines of the area except that the areas of doors and all other openings which are 0.1m2 in cross-sectional area or larger will be conducted. Payment for furnishing and laying internal and external walls will be made at the applicable unit price per square meter tendered thereof in the Bill of Quantities. These unit prices shall include the cost of all labour and materials required to perform the work described in this Clause.

4 CONCRETE WORK

4.1 FORMWORK

General

1. Before any Concrete is placed, the Contractor is to submit to the Employer, for approval, a detailed plan of the formwork be proposed to use. The Contractor shall provide and maintain in good condition all necessary forms, modules, shutters and centers for shaping the concrete.

2. Forms shall conform to the shape, lines and dimensions of the concrete as called for the plans and shall be set up true to line and grade, properly braced and erected in manner sufficiently substantial to maintain position and shape during operations incidental to the placing and tamping of the concrete.



3. The method of forming, shape, size and strength of forms must be to the satisfaction of the Employer. Any forms condemned by the Employer be immediately removed from the work or so strengthened and altered as to conform to his requirements. Special case must be taken to prevent bulging or vibration, and forms are to be sufficiently tight to prevent leakage of mortar.

4. All rubbish, particularly clippings, shavings, and saw dust shall be removed from the interior of the forms before the concrete is placed and the formwork in contact with the concrete shall be cleaned and thoroughly wetted.

5. Forms for walls, columns and tanks are to be constructed of smooth, clean T. and G. timber of uniform thickness, free from loose knots and other defects and dressed on the inside and on both edges for face work, secured to studs and farming in horizontal or vertical lines. Joints are to be horizontal or vertical.

6. As an alternative to the use of dressed T. and G. timber for sheathing, the Contractor may submit for approval methods of lining the forms so that a smooth surface free from waves or other defects is obtained. Approval by the Employer will in no way affect the Contractor's obligations under the contact to provide sound concrete of good appearance and finish.

7. Before erection forms are to be coated on the inside with mineral oil, soft soap or other suitable substance to prevent adhesion and to allow of the concrete stripping with fair surface.

8. Floor forms may be constructed of dressed T. and G. timber as specified above, or of plain timber dressed on one side having both edges shot, the whole to be covered with tarred building paper so that there is no leakage of mortar, and so that the soffit will present a good appearance when stripped.

9. The means adopted for holding forms in position shall be approved by the Employer. Ties between wall forms must be at least 12mm dia. and spaced so as to firmly hold the forms in position during pouring operations. The number of bolts shall be restricted to the minimum consistent with the requirements of maintaining the shape and lines of the concrete. Ties shall be so placed that they pass through studs or walls as seating.

10. All bolts and rods used as ties through the concrete must be withdrawn within two days after pouring. Care must be exercised when withdrawing bolts that no undue strain is put on any part of the structure.

11. Holes formed by ties shall be plugged with a head, cork or rubber stopper near the center of the wall section and filled with a dry 1:2 cement mortar well rammed into position to a neat finish.

12. Forms may be used repeatedly till they are maintained in serviceable condition and are thoroughly cleaned and re-oiled before used. Forms unsatisfactory in any respect shall be used, and the Employer may direct them to be destroyed.

13. Measurement shall be in square metre of the area of the shuttering which is in contact with the concrete. The rate shall include the removal of forms and finishes too.

Removal of Forms

14. Forms shall not be removed from the concrete unit it has adequately hardened, and the time as given hereunder in Table has elapsed since the placing of the concrete:

Min. temperature endured by concrete prior to

stripping Vertical Surfaces

Bottom forms of beams or other surfaces less

than 2m span

Beams of longer than 2m and columns

20ºC and over 1 day 7 days 9 days

20ºC – 10ºC 2 days 10 days 14 days

10ºC – 0ºC 4 days 14 days 21 days

15. During the period while forms are in place, wedges under toms or other supports must be kept tightened daily to take up contraction of timber or change in level of the structure.



4.2 Reinforcement (Steel) Works

16. Bars shall be straightened to eliminate any bends or Links developed during delivery to the site. Bars shall be cut into the length and hooked and bent. Bars shall not be straightened or bent in any way that may be injurious to the material.

17. Bent bar reinforcement shall be cold bent to the shapes. Bending of bars shall confirm to IS: 2502-1963. After cutting the bending, the bars shall be bundled or stocked according to their respective marks. All steel reinforcement shall be accurately placed in the positions shown in the drawings firmly held during placing and setting the concrete. Bars shall be held in position by wiring at all intersections with annealed wire not less 1.25 mm diameter (preferably 16 gauge).

18. Distance from the forms shall be maintained by Pre-cast mortar blocks, plastic tipped metal chairs, metal hangers, plastic chairs or other approved devices. Metal supports and tie wires which extend to the surface of the concrete shall not be permitted. Stirrups and distribution bars shall pass around the main bars and shall be securely wired thereto.

19. Splicing of reinforcing bars shall be either by lapping, or mechanical butt splicing at the option of the Contractor. Bars in excess of 44mm diameter shall not be spliced by lapping. The location of splices shall be determined by the Contractor based upon using available commercial lengths where practicable. Unless otherwise approved by the Employer, splices in adjacent reinforcing bars shall be staggered. The minimum distance between staggered spices for reinforcing bars 25mm diameter or smaller shall be the length required for a lapped splice in the bar. The minimum distance between the staggered butt splices for reinforcing bars 44mm and larger shall be 1500mm.

20. Completed welded butt splices and mechanical butt splices shall develop not less than 90 percent of the specified minimum ultimate tensile strength of the un-splice reinforcing bar. Acceptance of welded but splices and mechanical butt splices of approved design shall be based on qualification test performed prior to making spices to be used in the work and upon job control tests made during the progress of the work. Such tests shall consist of the fabrication and testing by the Contractor of sample splices and shall include testing satisfactory to the Employer on all or any splices. Acceptable sample splices shall conform to the splicing requirement in this Clause.

21. Splices made by lapping shall consist of placing reinforcing bars in contact and wiring them together in such a manner as to maintain the alignment of the bars and to provide the minimum specified clearances. The length of lapped splices shall be as shown in Table unless otherwise specified in the Contract or ordered by the Employer.

Type of Bar Diameter of Bar Length of lapped splice in diameter

Mild Steel Upto 32 mm 50 dia. of smaller bar

Medium Tensile Steel 25 mm or less 45 dia. of smaller bar

Medium Tensile Steel 29 mm, 32 mm, 35 mm 50 dia. of smaller bar

22. Splices in bundle bars of 2 bars shall be 1.2 times the single bar lapped splice length and bundles of 3 bars 1.33 times. Bundles of more than 3 bars shall be spliced by butt welding or mechanical butt splicing. Spiral reinforcements shall be lapped 80 diameters. Spiral reinforcements at splices and at ends shall be terminated by a 135 degrees hook with a 250 mm tail. Mesh reinforcement shall be lapped at least one mesh. All welded splices shall be full penetration butt welds complying with IS:2751-1966. Mechanical butt splices may be either the sleeve filler metal type or the sleeve threaded type. They shall be of a design approved by the Employer in writing.

23. Reinforcement bars shall be bent by approved means producing a gradual and even motion. Bars shall comply with the overall dimensions of bent or internal dimensions of bindings or the like shall be within a tolerance of 20mm. Any discrepancies or inaccuracies found by the Contractor shall be immediately reported to the Employer, whose interpretation and requirements relating thereto shall be accepted. The internal radius of bends shall not be less than twice the size of the bars unless described to the contrary



on the bending lists or elsewhere in the drawing. Hooks and other anchorage bends for mild steel shall be bent to an internal radius of the bends at corners of binders or stirrups or links shall be half the size of the bar embraced by the binder stirrups or links.

24. Reinforcement shall be placed in position. All bars are to be lapped for at least fifty (50) diameters. The least distance between parallel bars is to be 25 mm or one diameter whichever is greater. The positions of the laps have to be staggered throughout unless shown otherwise.

25. Unless otherwise directed by the Employer, reinforcement shall have concrete cover and the thickness of such cover shall be:

i. At each end of the reinforcing bars not less than 25 mm nor less than twice the diameter of such bar;

ii. For a longitudinal bar in a column not less then 40 mm nor less than the diameter of such bar. In case of column of minimum dimension of 200 mm or under, whose reinforcing bars do not exceed 12 mm, a cover of 25 mm shall be used;

iii. For longitudinal reinforcing bar in a beam not less than 25 mm nor less than the diameter of such bar;

iv. For tensile, compressive, shear or other reinforcement in a slab, not less than 15 mm nor less than the diameter of such bar;

v. For any other reinforcement, not less than 25 mm, nor less the diameter of such bar.

vi. For reinforced concrete members immersed in sea water, concrete cover over reinforcement shall be minimum 50 mm.

vii. The max. cover for reinforcement shall not be more than 75 mm.

viii. Unless otherwise specified by the Employer, tolerances for placing of reinforcement shall be within the following tolerances:

• For effective depth 200 mm or less +(-) 10 mm

• For effective depth more than 200 mm +(-) 15 mm

ix. The cover shall in on case be reduced by more than one third of the specified cover or 5 mm whichever is less.

26. Measurement for purpose of ascertaining payments due to the contractor the basis of measurements of bar and wire reinforcement used in the works shall be calculated in weight in kg. which shall be computed from the sizes and length of the bars as used in the construction and as approved by the Employer. No allowance in the weight shall be made for cutting to waste, rolling margin extra length, or other tolerances. The contractors rate for unit weight fo bar reinforcement shall be deemed to include all allowances omitted in calculation the weight and for any other tolerances, and for providing typing wire spacer bars and cover blocks for carriage and haldling for bending, hooking, cranking, and for fixing and maintaining in correct position in the works. Standard laps of the lengths as shown in the drawing or as instructed at site shall be admissible

27. The detail of reinforcement according to the drawing is to be prepared by the contractor. It shall have to be approved by the Employer before the execution of the works.

4.3 Plain Cement Concrete (PCC) Works

28. Grades of Concrete: The concrete shall be in grades designated in the following Table. In the designation of the concrete mix, letter M refers to the mix and the number to the specified characteristic compressive strength of 15 cm cube at 28 days and is expressed in N/sq.m.

Grades of Concrete

(In Accordance to Clauses 5.1, 5.2.1, 8.2.1, 14.1.1, 35.1 of IS:456-1978)



Grade designation Specified compressive strength at 28 days (N per sq.

m.)

M10 (1:3:6) 10

M15 (1:2:4) 15

M20 20

M25 25

M30 30

M35 35

M40 40

M45 45

M50 50

M55 55

M60 60

29. Grades of concrete to be used shall be as directed by the Employer. In any case, grades of concrete lower than M15 shall not be used in reinforced concrete. Grades of concrete M5 and M7.5 may, be used for lean concrete bases and simple foundations for masonry walls.

30. The mix proportions shall be selected to ensure that the workability of the fresh concrete is suitable for the condition of handling and placing, so that after compaction it surrounds all reinforcements and completely fills the formwork. When concrete is hardened, it shall have the required strength, durability and surface finish. The determination of the proportions of cement, aggregates and water to attain the required strengths shall be made as follows:

• By designing the concrete mix,

• By adopting nominal concrete mix.

31. Design mix concrete shall be preferred to the nominal concrete mix. If design mix concrete cannot be used for any reason on the work for grades of M20 or lower, nominal mixes may be used with the permission of the Employer.

32. Unless otherwise agreed by the Employer concrete shall be mixed in a batch type mixer which shall comply with IS:1791-1968, IS:4935-1968 or such other type as the Employer may approve. When swing-type weight batches are used they shall comply with IS:2722-1964. Batch mixers will be tested and perform in accordance with IS:4634-1968 or such other tests as the Employer may require. Mixers which have been out of use for is mixed. Concrete shall not be mixed when the air temperature in the shade is below 3o C (38oF) unless special precautions are taken which have been approved by the Employer. During hot weather the Contractor shall ensure that the constituent materials are sufficiently cool to prevent the concrete from stiffening in the interval between it's discharge from the mixer and it's final position. Concrete shall be mixed for not less than 90 seconds nor more than 5 minutes from the time all constituents have been introduced into the mixer.

33. Hand mixed concrete shall only be used when specified or authorized in writing by the Employer. It shall be made in batches of not more than 0.25 cubic meters and shall be mixed on a water tight level platform. The proper amount of coarse aggregate shall be measured in measuring boxes and spread on



the platform and the fine aggregate spread on this layer, the two layers being not more than 300mm in total depth. On this mixture will be spread the dry cement and the whole mass turned not less than 2 times dry, then sufficient clean water shall be added, evenly distributed and the whole mass again turned not less than 3 times, not including placing in the carriers or forms.

34. Ready mixed concrete batches off the site may be used only with the approval of the Employer and shall comply with the requirements of IS:4926-1968.

35. Concrete shall be laid in horizontal layers of not more than 15cm (6") thick and gently vibrated by mechanical vibrator and tamped by hand spading. Contractor shall make daily concreting schedule and submit to the Employer for approval.

36. After laying the concrete shall be kept wet for fifteen days. If cast is hot weather, it shall be covered with gunny bags which shall be kept constantly wet. Other works on concrete shall not start until after three days of laying the concrete.

37. Cement: The cement shall be ordinary Portland cement of approved brand and manufacture shall comply all respects with the least I.S. 269 for ordinary Portland cement. It shall be delivered on the site in package with an unbroken seal fixed by the makers and plainly marked with the name of brand and the manufacture. It shall be stored in a dry place, when stored in bags these shall be raised 30cm above the ground stacked in rows of 10 bags high, 60 cm clear from the wall. The bags should be placed in such a manner that it will be efficiently protected from the moisture and contamination, and that the consignments can be used in the order in which they are received. If necessary cement shall be screened at Contractor's expense to remove any lumps. No cement which has become damaged shall be used in the work, but shall be immediately removed from the work and replaced by the Contractor at his own expense.

38. If desired tests shall be made by taking random samples of cement from stores or elsewhere from the works. The selection of samples and procedure for testing shall comply with appropriate Indian Standard.

5 CEMENT CONCRETE FLOOR FINISH 1. This Clause shall cover cement plastering floor finish, cement plastering skirting and waterproof cement

plastering skirting and waterproof cement plastering. The Contractor shall apply 1 coat cement plaster where shown on the Drawings or directed by the Employer.

2. The concrete surfaces to be plastered shall be clean and free from loose materials, fins, incrustations, oil, paint, dirt and any other materials that might prevent satisfactory bond. Before the plaster coat is applied the surface to be plastered shall be kept thoroughly and continuously damp for at least 24 hours and then allowed to stand until the surface film of moisture has disappeared.

3. All the materials to be used such as cement, sand, aggregates, water and other materials shall be Standard Construction Materials as specified in this specification or as directed by the Employer. Colour pigment shall be of superior quality conforming IS Standard and as approved by the Employer.

4. Cement concrete and cement sand mixes for flooring works shall be mixed as specified in the section “Plain cement concrete” and “brick masonry work”. Color pigments with cement shall be mixed only required in the contract and in a manner and proportions as directed by the Employer.

5. All plaster shall be mixed in a batch mixer for not less than 2 minutes until it is uniform in colour and in compositions. Re-mixing of plaster with addition of water will not be permitted. Plastering shall not be allowed to become colder than 10oC. Plaster shall be used within 1 hour of mixing and all plaster remaining after this period shall be discarded.

6. Cement floor plastering shall consist of 1 part of cement and 3 parts of fine aggregate, by volume. The cement plaster shall apply in such a manner as to produce a uniform smooth surface which is true to level. The required surface finish shall be finished with a steel float. Each surface to be plastered shall be finished in one operation to avoid jointing marks.

7. Waterproof cement plastering shall be applied where shown on the Drawings and other miscellaneous areas as directed by the Employer. Waterproof admixture shall be used in the cement mortar in accordance with the manufacturer's recommendations to provide effective waterproofing. Samples or



catalogues of waterproofing admixtures shall be submitted for approval to the Employer. Mix proportion of cement mortar shall conform to the descriptions above.

8. In the ground floor, the cement concrete floor shall be laid on a hard surface of either lime concrete or week cement concrete or boulder stone soling. If the base consist of lime concrete, the lime concrete shall be allowed to set for seven days. If the base is made of weak cement concrete, the flooring work shall commence within 48 hours of laying the base. If the base consist of boulder stone soling, the surface shall be leveled with the used of stone ballast or weak concrete mixture before the concrete flooring is laid. The base shall be cleaned with brushes and wetted properly before the concrete flooring is laid.

9. In the first floor of upper floors where cement concrete floor is to laid on R.C.C. slabs, the surface of the R.C.C. slab shall be made rough with brushes while the concrete of the slab is still green. The base shall be provided with the slope required for the flooring as directed by the Employer.

10. The floor shall be leveled and divided into panels of sizes not exceeding 1.2m in the smaller dimensions and 2.0m in large dimension. Formwork planks 3mm thick and depth equal to the thickness of the floor shall be fixed in the floor base. Required chamber or slope shall be given in the floor for draining wash water. The sides of the planks shall be coated with one layer of oil before placing concrete.

11. The surface of the base onto which the concrete floor is to be laid shall be made rough, cleaned and soaked with water followed by a cement wash before laying the concrete floor. Concrete flooring shall then be laid alternately onto each panel evenly, compacted by beating with wooden "Thopies" and the surface shall be tamped with wooden tampers. The surface shall be smoothed with wooden floats and any unevenness shall be made good with the use of 1:2 cement sand mortar. The joints between the concrete panels shall be filled up to half depth with 5 coal tar and rest of the depth shall be filled with cement sand mortar of weak proportion.

12. One layer of at lest 12mm thick cement sand plaster of the specified proportion (1:4 or 1:6 Cement Sand mixture) shall be applied onto the surface of the cement concrete floors. The cement plaster shall be laid according to the dimensions of the concrete floor panels and keeping the joints above the joints between the concrete floor panels. Such plaster shall be followed by a thin layer of at least 3mm thick cement punning of specified mix (1:1 or 1:3 Cement Sand Mixtures) and shall be finished with wooden or steel floats.

13. The whole operation of laying the cement concrete flooring into alternate panels shall be done only after the setting of the previous concrete flooring. After laying the cement concrete floor, the surface shall be left undisturbed for about 2 hours after which it shall be covered with wet jute bags. Curing of the concrete by flooding water on the surface for at least 7 days shall commence only after 24 hours of laying the concrete.

14. The same brand of cement shall be used throughout and the same proportion is maintained strictly to have a uniform color. Junctions of the floor with wall plaster, dado and skirting shall be rounded of neatly.

15. All slopes of the floor shall be towards the outlet at the rate of 0.75 to 1.0%.

16. Skirting work shall be done simultaneously with flooring work or as directed. Skirting work shall include racking, cleaning and wetting of the base as well as applying cement plaster and cement punning. The top edge of the skirting shall be champhered to prevent dust collection. All the top lines shall be in perfect line and level (if sloped regular). The vertical joints of the skirting in case tiles are provided shall be in the regular pattern corresponding to the joints of floor. The parts of the walls where the tiles are to be provided shall be chiselled, rocked, brushed and cleaned properly and cement mortar of the specified proportion is then provided. Other method of laying may also be used but only with permission of the Employer.

17. Telia, Cement, Marble, Mosaic or Terrazzo Tiles: The tiles shall be soaked in water for at least 2 hours before laying. Tiles which are to be fixed in the floor adjoining the wall shall be arranged so that the surface of the round edge tiles shall correspond to the skirting and dado. Neat cement grant of honey like consistency shall be spread over the bedding mortar just to cover so much area as can be tiled within half an hour. The edges of the tiles shall be smeared with neat white cement slurry and fixed in this grout one after the other, each tile being well pressed and gently tapped with a wooden mallet till it is properly bedded and in level with the adjoining tiles. There shall be no hollows in the bed or joints. The joints



shall be kept as close as possible and in straight lines. The joints between the tiles shall not exceed 4.50 mm wide. The joints shall be grouted with slurry of white cement.

18. Special care should be taken for draining out the water while laying the tiles in the terrace. The slopes and positions of drains shall be as directed by the Employer. Wherever the outlets are to be located, the tiles shall be cut properly to make a hole of the size of the outlet. In case of vertical down pipes, where tile cutting is not possible, the tile at that particular location shall be omitted and the surface finished with the use of the same material as that is to be used on the tile surface.

19. Curing: The surface shall be left dry for air-curing for a duration of 12 to 18 hours depending upon the atmospheric and temperature conditions. It shall then be cured by allowing water to flood over the surfaces for a period of at least 7 days.

20. Measurement, for payment, of laying anti-acid floor tiles and vinyl tile paving will be made of the area required to be covered. Payment for laying anti-acid tiles and vinyl tile paving will be made at the unit prices per square meter stated in the Bill of Quantities, which unit prices shall include all labour, equipments, materials and all other accessories required to perform the work described in this Clause.

6 CEMENT PLASTER WORK 1. Sand: Sand shall be clean river or pit sand of approved quality and free from salt, dust or other

impurities. If required by the Employer, it shall be washed with clean water and more than 5% of material (clay, dust and silt) will be allowed, as tested by the settlement in water. The sand may contain particle size up to 50mm and should be well graded. Coarse sand for concrete work shall be from local rivers or from any other place as approved by the Employer and shall conform to cement concrete specification.

2. The ideal number of plaster coats, where practicable, is two, namely, the undercoat followed by a finishing coat. It is recognized, however, that much successful work has been carried out in the past with plaster finishing coats with a single coat on reasonably plane backgrounds of brick, concrete and similar materials. However, for very rough surfaces, such as rough stone masonry, requires a three coat plaster finish for successful results. Renovation work on wood laths should also be carried out in three coats.

3. The range of coats normally employed for different backgrounds is as follows:

Background Number Of Coats

Brickwork or hollow clay tiles 2 or 1

Concrete, cast in situ 2 or 1

Building Blocks 2 or 1

Wood or metal lath 3 or 2

Fibre building board (insulating board) 2 or 1

Wood wool slabs 2 or 1

4. Thickness of Plastering: The Contractor shall apply 12 mm thick plaster where shown on the Drawings or directed by the Employer. Finishing coats (and single coat work, where employed) shall be of such minimum thickness as just to provide a sufficient body of material to harden satisfactorily under the site conditions in any particular case. The total thickness of two-coat work exclusive of keys or dubbing-out shall be generally about, but shall not normally exceed 20 mm and it shall not exceed 15 mm in the case of in situ concrete soffits. The thickness of three-coat work shall be about, but shall not normally exceed 25 mm.

5. Cleanliness and Protection of Existing Work: Cleanliness is essential in carrying out plaster work. Adequate protection shall be given to all existing work and fittings which are liable to be damaged, not only in the area



of plastering operation, but also in the approaches there to by covering up with boards, dust sheets, etc, as necessary. The surfaces to be plastered shall be clean and free from loose materials, fins, encrustations, oil, paint, dirt and any other materials that might prevent satisfactory bond.

Before the first plaster coat is applied the surface to be plastered shall be kept thoroughly and continuously damp for at least 24 hours and then allowed to stand until the surface film of moisture has disappeared.

6. Proportioning: The material used in the preparation of plastering mixes may be measured by volume using gauge boxes. Cement shall be measured by weight. For the purpose of proportioning one cubic meter of cement shall be taken to weight 1,440 kg approximately.

7. Cement and sand shall be mixed dry in the required proportions to obtain a uniform colour. Water shall then be added to get the required consistency for the plaster. Cement plasters shall be used within half an hour after the addition of water. Any mortar or plaster which is partially set shall be rejected and removed forthwith from the site.

8. Mixing may be done either manually or mechanically. "Hand mixing" shall be carried out on a clean, water-tight platform. During mixing, the mortar shall be need back and forth for 10 to 15 min after the water is added. In "machine mixing" the mixer shall run at least 5 min after placing all the ingredients in the drum. Re-mixing of plaster with addition of water will not be permitted. Plastering shall not be allowed to become colder than 10oC. Plaster shall be used within 1 hour of mixing and all plaster remaining after the period shall be discarded.

9. Skirting/Dado Cement Finishes: The cement mortar plaster in the specified proportion shall be done on surface as in plaster works. The finishing coat of neat cement shall be done by applying thick cement slurry immediately after the initial setting of the cement mortar plaster. This cement slurry applied surface shall be finished smooth with metal trowel including rounding of junctions, corners etc. for which be smooth and uniform without patch marks. Patchy surface shall be rejected. The cement skirting/dado shall be cured for at least 7 days and well protected. Sample of workmanship shall be approved prior to commencement of work.

10. The Contractor shall protect all plaster work from damage. Damaged drummy or otherwise defective plaster shall be replaced at the Contractor's expense, and in such a manner that on completion of the Contract the plaster shall be sound and the general appearance of the work shall not be marred.

11. Payment for cement plaster will be made at the unit rates per square meter tendered therefore in the Bill of Quantities. This unit rate shall include the cost of all labour, equipment and materials required to perform the work described in this Clause.

12. The contractor shall furnish and fix ceramic wall tiles where shown on the Drawings or directed by the Employer. Ceramic wall tiles with 25 mm thick cement mortar (1:3) shall be of glazed surface and of colours and patterns selected by the Employer. The tiles shall have grooved backs and shall have square sharp arises except where rounded edges are necessary for the required finish. Where openings are to be left in tiled surfaces, tiles shall be neatly cut as required to conform to the shape of such openings.

13. After the scratch coat has been allowed to stand for 24 hours a float shall be applied. The float coat shall consist of 1 part of cement, and 3 parts of fine aggregate by volume. The ingredients shall be mixed with water to produce a mortar of uniform consistency. The float coat shall be applied and brought flush with screeds to temporary guide slips to give a true, even surface at such distance from the wall as will ensure the required lines of the finished face.

14. Before the float coat has stiffened the tiles shall be fixed in place. Tiles shall be stocked in water for 12 hours immediately prior to fixing. Before setting each tile a thin coating of cement plaster shall be spread on the back face of the tile or on the surface of the float and the tile shall be firmly tapped into position. Joints between adjacent tiles shall be straight, plum and level and 1.5mm wide and the finished surface of the tiles shall conform to the specified lines to the satisfaction of the Employer.

15. Where shown on the Drawings or as directed by the Employer wall tiles shall be bedded on approved mastic compositions. Immediately after a suitable area of tiles has been set, the joints between tiles shall be filled with a plastic mix of neat white cement and water. The joints shall be tooled to form a slightly concave surface, excess mortar shall be removed and the faces of tiles shall be wiped clean. Joints between



tiles and pipes or other fittings which pass through tiled surfaces shall be formed with light coloured mastic calking.

16. Measurement, for payment, for fixing ceramic wall tiles will be made of the area required to be covered with ceramic wall tiles. Payment for furnishing and fixing ceramic wall will be made at the unit rate per square meter tendered therefore in the Bill of Quantities. The unit rate includes the cost of all labour, equipment and materials required to perform the work described in this Clause.

7 SUSPENDED CEILING 1. This specification covers fixing the following types of ceiling coverings underneath flat roof, hipped

roofs, gabled roofs, lean-to roofs of different types, or timber or steel and other metal trussed frames:

• Wooden planks or boards,

• Gypsum plasterboard,

• Plywood and blackboards,

• Fibre building boards,

• Anulyte boards.

2. Fixing Accessories

i. Screws: Screws Unless otherwise mentioned, this will mean wood screws.

ii. Nails: These refer to panel pins which are used for keeping boards in position before the screws are fixed.

Fixing devices, such as expansion wall plugs, expansion shells, caulking devices, etc, shall be as described in IS: 1946-1961 Code of Practice for Use of Fixing Devices in Walls, Ceilings and Floors of Solid Construction.

Wooden or metal framework consists of longitudinal bears and cross bearers by means of which the ceiling boards or coverings are supported.

3. Materials

i. Gypsum Wallboard: This shall conform to IS:2095 - Specification for Gypsum Wallboard. Gypsum boards used for ceiling shall not be larger than 1.2 m x 1.8 m.

ii. Fibre Building Board: Fiberboard shall conform to IS:1658-1960 Specification for fibre Hardboard.

iii. Plywood: This shall conform either to IS:1328-1958 specification for decorative plywood or shall be of a quality not less than type BC of IS:303-1960 (Revised). Generally plywood used for ceiling shall be size 0.9 to 1.2 m x 0.9 or 2.4 m. The thickness of plywood may vary from 4 to 9 mm.

iv. Blockboard: This shall conform to IS:1659-1960 specification for Blackboards. Blackboards are available thicknesses and sizes. Generally boards of thickness 12 mm, 16 mm and 20 mm, and of sizes 180, 150, 120 cm in length, 120, 90 cm in width shall be suitable for ceiling coverings.

v. Anulyte: These shall conform to relevant indian standards.

4. Fixing Devices:

Panel pins used for tacking ceiling coverings shall conform to the relevant requirements in IS:723-1961 specification for Mild Steel Wire Nails (Revised).

Other fixing devices, such as expansion wall plugs, shall conform to the relevant provisions given in IS:1946-1961 Code of Practice for use of fixing devices in walls, ceilings and floors of solid construction and IS:2097-Code of practice for use of fixing devices in cavity construction.



Mild Steel angle cleats used for fixing together the cross and main members of the ceiling framework shall be of such size as to accommodate at least two screws and bolts on each side for connection. Alternatively, specially designed clip system may also be used to connect the cross and main members of the ceiling framework.

Screws used for fixing ceiling coverings shall conform to IS:451-1961 Specification for Wood Screws (Revised).

Bolts, nuts and washers used in fixing the framework shall be free from rust and shall be greased before use.

5. Suspenders for Ceiling Framework: These may be fabricated from mild steel flats or other metal sections. They shall preferably be in two pieces so that the length of the suspender may be adjusted slightly during fixing of the ceiling frames. The shape at the top end shall facilitate a firm suspension from the structural floor above with proper anchorage. Where mild steel flats are used as suspender, they shall be of one of the following sizes:

• 35 to 40 mm x 6 mm,

• 45 to 50 mm x 6 mm,

• 60 to 65 mm x 6 mm,

6. Metal Framework: The framework may also be made of sections of light metal, such as aluminum, the shape of cross-section being such as to facilitate proper suspension and proper fixing of the ceiling coverings to them.

7. Fixing Gypsum Plaster Boards:

i. The nails used for tacking gypsum boards shall be of 2.5 or 2.65 mm size with a head diameter of 5 to 10 mm. The length of nails shall be as follows:

• For 10 mm thick board About 30 mm

• For 12 to 16 mm thick board 35 to 40 mm

ii. Only screws shall be used for fixing gypsum boards though nails may be used for initial tacking. The screws shall be countersunk. The sizes of screws shall be 2.39 or 2.7 mm dia (12 or 13 gauge) and the length as follows:

• For 10 mm thick board About 30 mm

• For 12 to 16 mm thick board 35 to 40 mm

iii. The screw shall have 10 mm minimum clearance from the edge of board. Steel screws without brass or nickel coating shall not be used.

iv. Jointing: The boards shall be fixed with a joint clearance of about 6 mm. The joints shall always be in perfect line and plane. Jointing may also be provide in a decorative pattern. The joints shall be filled with gypsum plaster or other finishing materials recommended by the manufacturers of the boards. After filling the joints, a thick skin of the finishing materials shall be spread about 5 cm wide on either side of the joint and onto it shall be trolled dry a reinforcing scrim cloth about 10 cm wide. When metal scrim is used, a stiffer plaster will be necessary to enable the trolling of the scrim down to the board. The joints may be left open also, if directed by the Employer.

8. Fixing Plywood, Blackboards Or Anylute Boards

i. The framework battens and cross battens supporting the ceiling shall be spaced in sections determined, taking into consideration the size and shape of the board, the thickness of the board, including its strength and weight, the pattern of the figure and grain matching in the case of decorative boards, another considerations specified as directed by the Employer.

ii. For boards in thickness 4 mm to 10 mm , spacings vary from 45 cm to 60 cm for longitudinal battens and 60 cm to 120 cm for cross battens. For boards above 10 mm thickness, the above spacings may vary from 60 cm to 90 cm for longitudinal battens and from 90 cm to 130 cm for cross battens. The work shall, however, be done as directed by the Employer.



iii. The sizes of battens may range from 65 mm to 75 mm x 40 mm to 50 mm but shall be as directed by the Employer.

iv. After fixing, the framework shall be checked with regard to the level position of its outside surface and for proper fixtures and joints.

v. The plywood or other boards shall be checked for correct size, squareness of adjacent sides and laying patterns. In the case of decorative boards, the pattern and figure matching should have been decided and put on paper, and boards preferably numbered for their positions. Any board so required shall be cut to the required plan.

vi. Where necessary, particularly when it is not sufficiently thick to be self-supporting from edge to edge, plywood may be stiffened along the edges and also in intermediate positions by stiles or narrow strips of wood, metal, plastic or other materials.

vii. The boards shall be carefully lifted in a predetermined manner and fixed on to the frame by use of wood screws. All the edges shall be fixed to frame members by screws spaced 7.5 cm center-to-center for 4 mm to 6mm thick plywood; for thicker boards the center-to -center spacing of these screws may be at about 15 times the thickness. The screws shall have a clearance of 10 mm from the edge line. At the lines of intermediate support, the screws shall be fixed at center-to-center screws shall be countersunk.

viii. The screws shall be fixed starting from one corner and extending to both sides to fix the board flat and level.

ix. The length of the screws shall be follows:

• For boards up to 7 mm 25 mm

• For boards above 7 mm up to 12 mm 35 mm

• For boards above 12 mm Thickness + 20 mm

x. Jointing: The boards shall be butt-jointed with a minimum clearance of 2 mm. The joints, if left open shall be filled with painter's putty and brought to level or may be cut to V-Shape. They may also be left open, levelled or parallel grooved using plane and a chisel or a grooving Cutter. The boards may also be pre-cut and edges rounded before fixing. In the case of decorative boards, the joints may be colored to match the general. The joint may also be open joints shall be covered by a molding or strips. When fixing molding in case of decorative boards, care should be taken that their color, shape and size are selected appropriate to the decorative pattern of the ceiling.

9. Finishing: The ceiling after fixing shall be finished by hand-sanding, where necessary, and given further finishes of waxing, polishing, clear varnishing or painting in accordance with the instructions of the manufacturers of these boards. Finishing of wood surface shall be in accordance with IS: 2338 - Code of Practice for Finishing of Wood and Wood-Based Materials in Buildings. When plywood or other boards with finished surface is fixed, care shall be taken during handling and fixing operation not to disturb and spoil the uniformity of the manufacturer's finish.

10. Measurement shall be done in square metre of the area where the suspended ceiling has been done. Rate shall include all the materials including any fixtures and accessories and labor for the execution of the work.

8 GLASS AND GLAZING 1. The Contractor shall furnish and install glass in the doors and windows where shown on the Drawings or

directed by the Employer. It shall be following types:

Polished plate glass - 6 mm thick

Sheet glass - 5 mm thick

Mould glass - 4 mm thick

Mould wire glass - 6 to 6.8 mm thick



The Contractor shall, if he proposes alternative product, submit catalogues and samples to the Employer for his approval.

2. All glass shall be accurately cut to fit in the places with 4 mm clearance all around. All glass shall be set in continuous beads or in vinyl glazing beads applied on all four sides for the full length and using spacer shims and clips at intervals recommended by the glass manufacturer. Glass for steel and aluminium sashes shall be set evenly in the rebates. Glass for wooden frames shall be fixed with triangular wood stops. All glass shall be thoroughly clean and polished when the building work is completed.

3. The Contractor shall be held fully responsible for any defective glass, caring of glass and all scratched, damaged or broken glass shall be removed and replaced. No separate payment shall be made for glass and glazing.

4. Measurement shall be done in square metre of the area where the glass and glazing has been done. Rate shall include all the materials including any fixtures and accessories and labor for the execution of the work.

9 PAINTING 1. Brushes for Painting: The brushes to be used shall be of bristles with good springiness and shall be

round. All new brushes shall be placed in water for two to three hours and then allowed to dry before use. All loose bristles shall be removed prior to painting. After the painting work is over, the brushes should be cleaned immediately by dipping into Kerosene oil. Brushes used in painting should be kept immersed in water or linseed oil during times when they are not to be used.

2. Application Of Paints On Different Types Of Surfaces

i. Painting New Woodwork: The number of coats of paint shall be as one coat of primer followed by two coats of paint.

ii. Preparation of Surfaces: The woodwork shall have been properly seasoned and dried before painting (i.e. wood should not contain more than 15% of moisture at the time of painting). The surface should be cleaned of any dust or dirt and should be made smooth. All the heads of the nails in the wood works shall be punched to a depth of 3 mm below the surface. If grease or oily substances are present on the surface, they should be removed by rubbing with a fine grade sand paper.

iii. Knotting: If the surface is knotted, then all the knots in the timber work shall be covered or killed by applying a first coat of red lead ground in water and mixed with strong glue in hot condition followed by a second coat of red lead ground in oil and thinned with boiled oil and turpentine.

iv. Priming or First Coat: After Knotting, the primer or first coat of paint shall be applied to fill the pores of the wood or any minute unevenness remaining on the surface. The primer coat shall be applied before fixing the timber work in its position unless otherwise directed by the Employer. Unless otherwise specified, the composition of the paint for priming shall be:

Composition Interior Work Exterior Work

Red lead 0.25 kg 0.04 kg

White lead 3.50 kg 4.50 kg

Boiled linseed oil 1.00 liter 2.25 liter

Litharge 0.05 gram 0.08 kg

v. Stopping: Stopping shall consist of rubbing down the primed dry surface with either pumice-stone, glass-paper or both and them filling up all the cracks, nail-holes, dents, open joints, etc. with approved putty. After the putty has dried and hardened, the surface shall be rubbed with glass-paper or pumice stone once again to level the surface. Putty shall be made by mixing



powdered chalk with linseed oil to a workable consistency unless otherwise directed by the Employer.

vi. Under-Coats and Finishing Coat of Paint: After the priming coat has dried, a second coat of paint of specified color and type shall be applied in exactly the same manner as the first coat. On drying of the second coat of paint, the surface shall be rubbed down with pumice stone or glass-paper. If any other succeeding coat excepting the finishing coat has to be applied, it shall be applied in a similar manner. After the under-coatings have dried, the finishing coat shall be applied to present a smooth and even surface without any brush marks on it.

vii. General Hints on Wood-Work Painting:

Painting shall be done in thin coats since thick coats take longer time to dry and generally begin to pluck off after some time. Each coat should be allowed to dry completely before applying the next coat. If, in case, lead paint has been used, then dry rubbing of the painted surfaces shall be prohibited. In such cases cloth or water proof sand paper should be used unless otherwise directed by the Employer.

If ready made paints are used, the instructions given by the manufacturers shall be followed.

3. Painting New Iron And Steel Works

i. Preparation of Surfaces: Before the application of the paint, the surface of iron or steel shall be well prepared. The surface shall be cleaned of all dirt, rust scales, grease and etc. All rust scales and dirt shall be removed by means of stiff wire brushes or scrapers unless otherwise directed by the Employer. Oil and grease may, it approved, be removed by petrol, benzine or lime water. The cleaned iron or steel surface shall then be treated with phosphoric acid to protect the surface from rusting and to provide a better adhesive surface for the paints.

ii. Priming Coat: After the preparation of the surface, the priming or first coat of paint of specified type shall be applied with a brush. The paint for priming or first coat shall consist of red lead powder dissolved in boiled linseed oil (15 kgs red lead with 5 liters of linseed oil).

iii. Undercoat and Finishing Coat: After the priming coat has thoroughly dried, the specified number of under-coats of the paint of specified color and type shall be applied alternately with brush or spray gun. Unless otherwise specified, the second coat of paint shall consist of 3 kg of red oxide paint, 0.5 kg of lamp block and 5 liters of boiled linseed oil. After the under-coats have completely dried, the finishing coat of paint of specified color and type shall be applied and shall present an even and smooth surface.

iv. Varnishing: Preparation of the surface, knotting priming and stopping shall be as mentioned for painting on wood or iron surfaces. On cleaned surfaces, two or more coats of varnish shall be applied. Varnishing shall not be done with ordinary paint brushes but with special fine-haired brushes as approved by the Employer.

4. Painting On New Wall Surfaces: Paint shall be applied only over a completely dry surface. Plastered surfaces shall be left completely dry out for a period of 3 to 6 months directed by the Employer. Before the application of paint washes such as white washes, color washes and such others to new wall surfaces, it is essential that the surfaces should be cleaned, brushed and freed from loose and any other foreign matters. All greasy spots shall be given a coat of a mixture of rice water and sand so that the washing paints stick to the surface. Cement plastered surfaces shall be washed with a weak solution of soap and dried before applying the washes.

5. White Washing

The complete process of white washing shall be carried out under the following operations:

i. Preparation of White Wash: The white wash shall be prepared from fresh burnt shall lime or pure stone lime as approved by the Employer mixed with water. Fresh lime shall be slaked at the site and dissolved in sufficient quantity of water. After slaking, the lime shall be allowed to remain in the water a pole until it attains the consistency of a thin cream. The mixture is then screened through a clean coarse cloth. Clean gum dissolved in water shall then be added at the rate of 2 kg per cu. m of lime. Alum or common salt may also be added in the same proportion as the gum if directed by the Employer.



ii. Preparation of Surfaces: Before the application of white wash to new wall surfaces, the surfaces shall be cleaned, brushed and freed from loose and foreign matters. All the holes in the wall, irregularities of the surface shall be corrected by filling with lime putty. All greasy spots shall be given a coat of a mixture of rice water and sand so that the white wash sticks to the surface. Cement plastered walls shall be washed with a weak solution of soap and dried before applying white wash.

6. Preparation Of Surface For Painting

i. The brand and color of the paint shall be as indicated by the Employer. If thinning is required, pure turpentine may be added to the required extent as directed by the Employer. The surface shall be made perfectly smooth by rubbing with sand paper of different grades first with a coarse one and successively with fine sand papers. All holes and open joints shall be filled with strong putty or with a mixture of glue and plaster which is smoothed by rubbing with sand paper.

ii. For steel works, all rust scales, dirt, grease, oil and other marks shall be removed by rubbing with sand paper and brushing with steel brushes before painting.

iii. The number of coats of paint shall be one primer coat followed by two coats of paint for new surfaces.

7. Cement Paint

i. Mixing: The dry cement paint shall be thoroughly mixed with clean fresh water so as to produce paint of required consistency which for normal work shall be that of ordinary paint. In mixing and application, the Contractor shall follow the manufacture instructions. Paint for application by brush shall be stained through paint strainer. The paint shall be kept stirred and used within the specified time of the manufacturer. Hardened or damaged paint shall not be used.

ii. Application of Cement Paint: The paint shall be applied by means of brushes and in the manner specified by the manufacturer. The number of coats shall be as mentioned by the Employer. The subsequent coats shall be applied after the preceding coat is properly cure, and has thoroughly hardened, inspected and approved and as per manufacturers' specification. Absorbent surface shall be evenly damped so as to give even suction. In dry weather, freshly painted surfaces shall be kept damp for at least two days and protected from direct sun.

8. Acrylic Emulsion Paint

i. Paint and Primer: The acrylic emulsion paint shall be approved quality brand approved by the Employer.

ii. Preparation of Surfaces: The surface where paint is to be applied shall be cleaned and smoothly sand papered, all dust being removed. If the paint is to be applied on a wooden surface a suitable filler materials shall be applied and sanded off to achieve a clean and smooth surface. When painting a metal surface, all loose scales, rust etc. shall be removed by the use of suitable sand paper.

iii. Application of Primer: Two coats of cement primer, wood primer or metal primer as required shall be applied. Each coat shall be approximately 20-30 microns when applied by brush. The primed surface shall be neatly and smoothly sand papered and cleaned.

iv. Application of Paint: The paint of approved shade shall be applied as per manufacturer's printed instruction by suitable brush. A minimum of two (2) coats shall be applied to achieve a uniform painted surface.

9. Synthetic Enamel Paint

i. Paint: The paint shall be of a superior quality brand approved by the Employer. It shall be in sealed tins and its type and use for exterior and interior surface shall be as per the manufacturer's printed instructions.

ii. Preparation of surface shall be as for Acrylic paints.

iii. Application of Primer: When synthetic enamel paint is to be applied into a cement plastered surface or concrete surface, two coats of suitable cement primer shall be applied to the clean



prepared surface. When the paint is to be applied to a wooden surface, two coats of wood primer shall be applied to the cleaned prepared surface. For metal surfaces 2 coats of metal primer shall be applied.

iv. Application of the Paint: Following the preparation of the surface and the application of the primer a top coat shall be applied. A second coat shall be applied after the first coat has dried. Care should be taken that dust or other foreign materials do not settle or otherwise disfigure the various coats. The same brand and same batch of materials shall be used for all coats. The paint shall be used and applied as per manufacturer's printed instruction. The paint shall be applied with bristle type brushes. The paints shall be applied in the thinnest possible layers with parallel drawings, no flow down shall be allowed. Painting of false ceiling or acoustic materials shall be by spraying only.

10. Oil Bound And Dry Distemper

i. Paint: The distemper shall be of British paints India Ltd., Jonson and Nicolson, India or any other superior brand approved by the Employer. It shall be in sealed tins. Generally synthetic washable distemper is available in paste form and dry distemper in power form.

ii. Preparation of Surfaces: The preparation of surface shall be as specified for acrylic paints. Oil bound distemper is not to be applied on freshly plastered surface.

iii. Mixing: The paste of synthetic washable distemper shall be thinned by adding 700 ml of cold water to every kg of distemper paste. Water should be added gradually to mix them properly to get uniform consistency. The dry distemper powder shall be mixed with 300-400 ml of clear warm water to a kg of distemper to obtain a creamy paste. The paste shall be kept aside for sometime. Then after 700-1000 ml of water shall be added to obtain a proper brushing consistency.

iv. Application: As described for synthetic enamel paint.

11. Colorless Water Proofing Paint In Exposed Brickwork

i. Paint: The paint shall be silicone resin base, as "Masonry Water Repellent Paint" of superior quality brand approved by the Employer.

ii. Application: The exposed brickwork shall be cleaned of all dirts and cement patches, loose mortars etc., the mortar joints or mortar pointing shall be rectified properly. The paint shall be applied by spray or brush. The paint shall be applied on dry surfaces only allowing 24 hours between coats. Generally two (2) coats shall be applied, unless it shows non uniform painted surfaces.

12. Paints shall not be applied when the air is moist or atmospheric conditions are such as to promote condensation or in the opinion of the Employer the condition are otherwise unsatisfactory for the work. Painting shall normally be carried out only in dry whether. It shall not be applied upon damp and moist surfaces.

13. Paint shall be applied into all crevices and corners where possible and the surfaces not accessible to brushes shall be painted by sheepskin or spray or and other method approved by the Employer. All runs or sags shall be brushed out. Painting shall be carried out in a neat and workmanlike manner. Paint shall be applied so as to produce a uniform even coating over the entire surface, free from streaks, pitting, wrinkles or other irregularities.

14. Sufficient time shall be allowed for one coat of paint to dry before the next is applied.

15. Painted surfaces shall be protected from sun, rain, condensation, contamination or surface damage until it is dry to the fullest extent. Boards indicating 'Wet Paint' shall be put up where necessary.

16. Measurement shall be in square metres of the actual covered area. Nothing extra shall be allowed for painting any rough surface e.g. external sand faced plaster or work in short width or surfaces in any shape.

10 TIMBER CONSTRUCTION 1. Timber to be used for the work shall be from a salwood tree. It shall be uniform in substance, straight in

fibre, free from large, loose, dead or cluster knots, flaws, shakes, wasp, cup spring, twist, bends saps and



defect of any kind. The timber shall be of best quality timbers specified in the item. The samples of the timber to be used shall be submitted for the approval of the Employer. The colour shall be uniform as far as possible. The moisture content for timber shall not exceed 12 percent of dry wet of timber.

2. Glue to be used shall comply with specification No. IS:852-1957 or 851-1957 in all respects.

3. Nails, screws, ties, straps, bolts, plates etc., shall be of the material, make schedules. These shall comply with ISI specifications published and revised from time to time but all as approved by the Employer.

4. As soon as the foundation of buildings are laid all necessary timber scantlings shall be brought to site and stacked as laid down as per IS code and kept under cover and allowed to remain till required. Timber for the works shall not be brought until seen and approved by the Employer who may reject the defective timber. Any effort like plugging, painting using any adhesives or resinous materials to hide defects shall render the pieces rejectable by the Employer. Timber presented for inspection shall be clean and free from dust, mud, paint or other materials which may conceal the defects. Cutoff ends for protection can be done after inspection with raw linseed oil or any other material approved by the Employer. No timber be painted, tarred or oiled without the previous permission of the Employer.

5. All scanting shall be dawn in straight lines and planes and of uniform thickness and full measurement from end to end and shall be sawn in the direction of the grain. They shall be sawn with such sufficient margin as to secure specified dimensions, lines and planes. All doors and windows frames embedded or in contact with masonry or concrete works shall be coated with two coats of bitumen emulsion.

6. All doors and windows frames (chowkhats) are to be provided with 18mm x 6mm flat iron hold fast 3800mm long and fixed by screws and embedded in the brick or stone masonry work with cement concrete block( 230mm x 100 x 10mm) in 1:2:4 or as specified by the Employer.

7. The shutter may be paneled single, double, triple or more. The design, panels and the number of panels to be used shall be as the direction of the Employer. The styles shall be continuous from top to bottom. The top, friz, muting or mullions shall be jointed to the styles and their muting shall be jointed to the rail. The thickness of the frame for the shutter varies from 30 mm to 50 mm depending upon the size of the door. The thickness of the panels shall be 12 mm unless specified otherwise. Grooves 15 mm deep shall be made on all inside faces of the frame to receive panels. Before fixing the panels in the grooves of styles, rails etc. paste of white zinc shall be treated on the panel for proper adhesion.

8. Fully Glazed or Partly Glazed Shutters: These shall be paneled shutter with glasses of various thickness. The glasses shall be of best quality free from specks bubbles, smokes, veins, air holes, blisters and other defects. The glasses shall of uniform thickness.

9. Louvers: Louvers shall be as per the instruction of site Employer.

10. Flywire Mesh Shutter: The workmanship shall be of best quality. The styles, rails etc. shall be rebated along the side to receive the wire gauge. The galvanized iron fly roof webbing of 16 mesh shall be used unless otherwise specified. The webbing shall be bent at 90 degree both sides to rebate and fixed securely to the styles, rails and muting. Fillets shall be of specified timber which shall be securely and neatly fixed with small screws. The space between the fillet and the rebate where the webbing is bent shall be neatly finished with putty, so that cut end of webbing may not be visible. Each shutter shall be fitted with necessary fittings of approved quality as shown on the drawing and specified in fittings item in this specification, with anticorrosive paint properly fixed jointly with flywire mesh.

11. The timber shutter shall be carried out in conformity with IS.1003 (part-1)-1966 for door shutters and IS.1003 (part-2)-1966 for windows and ventilator shutters regarding material, construction and workmanship. When ventilator is included, it shall be provided by having full length one piece post for door or window and ventilator extending the frame on top of the head to required extent. The unrabbited edges of the frame in the opening shall be rounded or beaded uniformly. When no sills are provided for doors, vertical posts or the frame in the ground floor shall be embedded in the sill masonry for 40mm.

12. On upper floors, vertical posts shall be fixed in the floor slab or masonry by forming notches 12mm deep. Holdfast shall be fixed with iron screws as specified. Any height adjustment of spacing for holdfast necessary shall be done to have the joints of masonry in courses. The frames shall be in position and held plumb with strong supports from both sides and built in solid masonry as it is being built. The shutters shall be of finished dimensions with ornamental moldings, plane, glazed and other components as directed by the Employer. The clearance between the finished shutter and the door frames and between



the shutter themselves shall not exceed 3mm unless otherwise specified. The fixing and size of hinges shall be as directed by the Employer, by cutting the necessary rebate, to correspond to the thickness of the flaps on the sides of the shutters style and the door frame.

13. The glazing on timber shutter shall be fixed with wooden beads and thin layer of putty. Beads shall be of Sal timber. First a thin layer of putty is pressed along the rebate then the glass is pressed, over which another layer of putty is laid and the wooden bead pressed and fixed with panel pins. In case of metal window shutters, glass shall be fitted with glazing clips and glaziers putty finished with putty knife.

14. The Contractor shall in all cases get approval from the Employer regarding time at which he shall carry out painting or oiling to wood work and obtain permission before he paints, oils or otherwise treats wood work. All parts of wood work resting on or set in masonry shall be well painted with 2 coats of hot boiled tar approved by the Employer. The tar shall be so applied as not to appear on exposed timber. No extra payment shall be made for such tarring. Timber buried in the ground shall be well coated with tar. When the end of beam or joint is embedded in masonry an air space or 6 mm shall be left at the end and sides wherever practicable and necessary in the opinion of the Employer.

15. All wood work shall be neatly and truly finished to the exact required dimension. Unless otherwise required in the special provisions, wood work which will remain exposed to view when the work is completed shall be accurately planned to the required dimensions perfectly smooth and to lines, planes or curves as required. Unless otherwise specified, all joints shall be simple tenon and mortise joint with the end of the tenon exposed to view. All mortise, tenon and other types of joints shall fit truly and fully without any wedging or filling, in a workman like manner. Only where specially required, the end of the tenon shall not show. All joints shall be as directed by the Employer. Where no specific instruction is given to the Contractor, he shall observe the following principle in forming joints:

16. All frame joinery for external work shall be put together with white leads and joints planed with hard wood or bamboo pins. For internal works where joints are not likely to be affected by moisture, the joints may be glued and similarly pinned. Where ordered, the butt joints shall be cross tongued and the tongues cut at right angle or diagonally to the grain of the wood. All moldings shall be cleaned and accurately finished and all meters etc., shall be properly met. Where turning is required it shall be done to the exact shape shown in the Drawings.

17. Framing: Framed wood work includes all sawing, cutting, planning, joining, framing, supply and use of all straps, bolts, holdfast, nails, tree nails, spikes, screws etc. necessary for framing and fixing. Framing and trussing are to be done in the best possible manner and all necessary ties, straps, bolts, screws etc., fitted as directed by the Employer.

Holes of correct size shall be drilled before inserting screws. Driving in or starting the screws with hammer is prohibited. All screws shall be dipped in oil before being inserted in the wood. The kind of nails and screws shall be subject to the approval of the Employer. The heads of nails or screws shall be sunk or dealt with as the Employer may desire.

18. Scaffolding: The Contractor shall provide all labor, scaffolding, ladders and tackle necessary for hoisting and fixing wood work in position and afford facilities for its inspection during construction. He is also responsible to see that the tackle and scaffolding etc. are of the requisite strength and that the work is secured in a proper manner during inspection. The Contractor shall be responsible for the safety of the work, workman and for any action or compensation that may arise in this connection.

19. Iron Work: All iron work connected with the wood work and to be embedded in masonry shall receive 2 coats of hot coal tar before erection. If it is to be painted, it shall be given the first two coats on the ground before being fixed in position and the third coat afterwards.

20. Precaution against Fire: No wood work of any kind shall be laid within 60 mm of a fireplace or fuel. During the progress of work all shaving, cuttings, and other rubbish shall be cleared away as the work progresses and all precautions shall be taken against fire. No rubbish shall be left under floor boards or in other concealed location on the job.

21. All wood work shall be inspected and approved by the Employer before being installed. The Employer will not be barred from rejecting any wrought timber on account of defective quality be reason of his having previously passed the same before it had been worked upon. In no case the wood work shall be painted or otherwise treated before it is inspected and approved by Employer.



22. All wood work in a building shall after it has been passed by the Employer have the primary coat of paint put on or otherwise treated before being fitted in position. The subsequent coats of paint or other finish shall be applied after the wood work is fixed in position.

23. Wooden door leaves: All wooden door leaves shall be flush type, 40 mm thick, with panels or louvers as shown on the Drawings and shall be faced with 6 mm thick first grade waterproof plywood. The plywood shall be covered with lauan lamina, putty polished and oil painted, panels or louvers if provided, shall be fixed with adequate beads.

24. Hardware: The Contractor shall supply and install the hardware for the wooden doors as listed in the Drawings or as specified by the Employer. The Contractor shall submit catalogues or samples of the hardware to the Employer for approval.

The hardware shall comply with the following requirements:

Hinges Bronze or stainless steel, 13 cm in approximate size, 3 hinges for each door leaf

Knobs Stainless steel

Lock sets Bronze, cylindrical loc, 3 sets of key to be furnished

Door closers Die cast aluminium body, oil and spring activated with 90 degree stop device

Push and pull handle For toilet doors, plastic made 15 cm x 25 cm in size

25. The Contractor shall supply master keys(s) set as directed by the Employer.

26. Measurement for payment for wooden doors shall be made on the basis of the actual total area in square meters requires to be closed supplied fabricated and fixed in accordance with the Drawings and the Specifications and as directed by the Employer.

The unit price tendered shall cover the cost of all labours, equipment and materials including supplying and installing wooden door, leaves including hardware and other relevant works required.

Painting finish for door leaves will be paid for under a separate item.

11 STURCTURAL STEEL WORK 1. Materials and workmanship: Materials and workmanship shall conform to the requirements of B.S.

449 or equivalent. All mild steel sections shall conform to the requirements of B.S. 15 or equivalent.

2. Shop Drawings: The Contractor is to prepare all the necessary shop drawings together with a marking plan indicating the location of the various individual members.

Copies of the shop drawings are to be submitted to the Employer for their approval and no Work is to be carried out until the Contractor receives this approval.

3. Welding: All welding is to be done strictly in accordance with section C of B.S. 449 or equivalent. The Employer is to be informed when the welded Work is ready for inspection and any such work must be left up-primed until the Project Engineer give their approval in writing.

4. Painting: All steel Work shall be wire brushed and free from loose scale and rust and painted with one coat of red oxide paint before being dispatched to the site. Surfaces brought into contact are to be first painted with red oxide paint and bolted together whilst wet. After erection the painting shall be inspected and all damaged areas, bolt heads etc. are to be painted as necessary.

5. Erection: The Contractor shall furnish at his own expense all necessary tools, staging, temporary members, guy anchors and all materials of every description which he may require for the safe erection of the steel work and remove the same when the work is completed. The Contractor shall be solely responsible for any damage done to the structure during erection and any members which have been bent



or otherwise distorted either before or during erection shall be straightened or replaced in an approved manner at his own expense.

6. Holes and Fixings: The Contractor shall ensure that all necessary holes or fixings, such as for electrical fittings, are correctly positioned in accordance with the Project Engineer's instructions.

7. Dimensions: The Contractor shall be solely responsible for the accuracy of the fitting together of the steel work and shall make all necessary site measurements.

8. Inspection: The Project Engineer shall be at liberty at all reasonable times to enter the Site of the Works, or any other premises in which the work in being prepared for the purpose of inspection. Any work found defective or which is not in accordance with the drawings or this Specification shall be rejected and such defective work shall be at once made good at the Contractor's expenses.

9. Measurement and payment: The structural steel work shall be paid in unit of weight in kg. according to the unit price supplied by the contractor in the bill of quantitites.

12 SHEET ROOF COVERINGS 1. The corrugated fibre, plastic, RMP sheets or G.I. Sheets shall be laid on wooden or steel purlins as

specified by the Employer. The maximum spacing of purlins shall be 1400 mm in the case of 7 mm thick sheets and 1250 mm in the case of 6 mm thick sheets or as directed by the Employer. However, the spacing of purlins in the case of 24 gauge C.G.I sheets shall not be more than 900 mm. The upper surfaces of purlins shall be in one plane so that the sheets shall rest on the purlins without forcing down. The minimum side lap shall be of one corrugation and a minimum end lap of 15 cm to 20 cm. (depending upon the roof pitch) or as directed by the Employer.

2. The sheets shall be fixed to the purlins by means or 3/8" (8 mm) diameter galvanized J or L hook bolts and nuts. A bitumen washer and a galvanized iron washer shall be provided for each bolt and nut before the nut is fixed. Each nut shall be screwed tightly first and when a number of sheets are laid, the nuts shall be tightened. The diameter of the holes shall be 1.5 mm more than diameter of the fixing bolt. In corrugated galvanized iron sheets, holes for nails, screws, rivets etc. shall be punched in the ridges with very sharp punches from below upwards while the sheets are still on the ground (that is before the sheets are laid in their positions).

3. Roof ladders or planks shall be used while laying and fixing the sheets. If in any case, any sheet gets damaged, it shall be rejected and replaced by another sheet. The finished surface shall be uniform and the lines of corrugation shall be straight and parallel.

4. Ridges shall be of the type as directed by the Employer. Ridges shall be free from cracks and damages. The ridges are usually in pairs having the required overlap. The ridges shall be fixed with the same type of galvanized iron J or L bolts and nuts with bitumen and galvanized iron washer which were used to fix the corrugated sheets with purlins. Hips if required shall be "Inserted adjustable hips".

5. In case it is specified or permitted by the Employer in writing clay ridges set in cement/lime mortar shall be provided instead of A/C ridge. The manufacturers of the ridges, hips and corrugated sheets shall, as far as possible, be the same and shall be approved by the Employer.

6. Wind ties shall be of 40mm x 6mm or as directed by the Employer. Wind ties shall be fixed at the cove ends of the sheets. The fixing of the wind ties shall be done with the same type of hook bolts and washers as were used to secure the corrugated sheets to the purlins.

7. Measurement of sheet roof covering shall be made according to the actual area covered by the roof covering measured in square metre and as per the unit price quoted in the bill of quantities. Such price shall include all the fixtures and accessories including hooks, washers etc and no extra payment shall be made for such accessories. The contractor shall include the rate of purlin in the unit price and no extra payment shall be made for the purlin.



13 SANITATION WORK 1. Requirements specified in the civil works section forms a part of this section. In case where the

specifications given are found insufficient, the latest Indian standard shall hold good. The workmanship shall be the best of its kind and shall conform to the specifications or Indian Standard or equivalent standard to be approved by the Employer, in every respect.

2. The sanitary, plumbing, water supply and other related works are to be laid alignments and grades modification shall be ordered by the Employer from time to time to meet the requirement of work.

3. The units used in this section are both FPS system depending on the general commercial practice, however, it is the Contractor's responsibilities to render the goods and supplies in such away that the case of inter changeability must be maintained for future repairs and maintenances.

4. Contractor shall provide all necessary holes, chases in structural members as building work proceeds. Wherever holes are cut or left originally they shall be made good with cement concrete 1:2:4 mix and the surface restored as in original condition. No additional payment shall be made for cutting and making good holes. Nothing extra shall be paid for cutting the chases stated otherwise.

5. Before use at site, all pipes shall be tested by filling up with water for at least 10 minutes. After filling pipes shall be stuck with a hammer and inspected for blow holes and cracks. All defective pipes shall be rejected and removes from the site.

6. Pipes shall be further tested after installation, by filling up the stack with water. All opening and connections shall be suitable plugged. The total head shall however not exceed 10 meters. All pipes shall be fixed in gradient towards the outfall drain. Pipes inside toilets shall be chase and concealed or otherwise as directed by the Employer.

7. HDPE Pipes

i. Where specified, waste and sewer pipes shall be HDPE pipes conforming to I.S. 4984-1978. Wall thickness and working pressure shall be as follows:

Nominal dia. Wall thickness min/max in mm Working Pressure kg/sq.cm

63mm 2.0/2.4 2.5

110mm 2.7/3.2 2.5

ii. Pipes shall be of color specified by the Employer. Filling for HDPE pipes shall include tees, bends, elbows, reducers and plugs. Outlets of suitable diameter for connection to the appliance shall be provided. HDPE pipes shall be jointed as recommended by the manufactures. Fixing of HDPE pipes shall be done in the best workmanship.

8. Galvanized Steel Pipes And Fittings

i. All water supply pipes inside the buildings and where specified by the Employer shall be galvanized steel tubes conforming to I.S.,1239-1964 of class specified seamless screwed and socketed.

ii. Fittings shall be malleable iron galvanized fitting of approved make. All fittings shall have manufacture's trade mark stamped on it. Fittings for G.I. pipes shall include couplings, elbows, tees, nipples, unions of approved makes 'S` or other equivalent.

iii. Pipes and fittings shall be jointed with screwed fittings. Care shall be taken to remove burr from the end of the pipe after cutting by a round file. Genuine red lead with grommet and a few strands of fine hemp shall be applied before fixing. All pipes shall be fixed in accordance with layout and alignment as specified by the site Employer.Care shall taken to avoid air pockets. As far as possible, G.I. pipes inside toilets shall be fixed in wall chases well above the floor. No pipes shall be run under the ceiling or floors and other areas.



iv. G.I. pipes in shafts and other locations shall be supported by G.I. holder bat clamps of approved quality. Pipes in wall chases shall be anchored by iron hooks.

v. Contractor shall provide adequate number of unions on all pipes to enable dismantling later on. Unions shall be provided near each gunmetal valve,stop cock or check valve and at an interval of 20m on straight runs.

9. All pipes, fittings and valves shall be tested by hydrostatic pressure of 7kg for Medium class. Pressure shall be maintained for a period of at least two hours without appreciable drop in the pressure after finishing at site. In addition to the testing carried out during the construction, Contractor shall test the entire installation after connections to the overhead tanks or pumping systems or mains. He shall rectify all leakages, and shall replace all defective materials in the system.

After commissioning of the water supply system, Contractor shall test each valve by closing and opening it a number of times to observe if it is working efficiently. The valves which do not operate effectively shall be replaced by new ones at his cost and tested as above.

10. Valves And Ball Cocks

i. Valves shall be heavy gunmetal full way gate valves or non return valves conforming to I.S. 778-1962 (class 1). Valves shall be tested at manufacturer's works to 21 kg/sq.cm. and shall have manufacturer's name stamped on all valves shall be approved by the Employer before they are used.

ii. Ball cocks used for storage tanks shall be high or low pressure ball cocks with brass lever rods and polytene ball floats. The ball floats shall conform to Indian Standard which shall be hammer tested.

11. Brass Fittings

All brass stop cocks and bib cocks shall be heavy type bright finished with renewable washers conforming to I.S. 781-1967. The weights shall be as below:

Diameter Stop cocks Bib cocks

15mm 0.40kg 0.40kg

20mm 0.75kg 0.75kg

25mm 1.30kg 1.25kg

12. G.I. Storage Tanks

i. Contractor shall provide and install G.I. sheet storage tanks as specified in scope of works. Tanks shall be fabricated from new sheets. Tanks with lengths up to 2m.shall be provided with one manhole cover,and of greater lengths than 2m. shall be provided with two manhole covers.Manhole covers shall be of G.I.sheet with locking arrangements. Contractor shall provide inlets, outlets, scour and overflow pipes, sockets for float level switches and interconnection if required. Overflow pipes shall be provided with a mosquito proof brass grating. Scout pipes of size as mentioned shall be provided with a bend and pipe piece and plug terminating outside the wall.

ii. G.I. sheet storage tanks shall be riveted construction. The sheet shall be of 16 BS gauge thickness riveted to angle iron frames. The sheets shall be fixed by means of 6mm dia. rivets at 30mm pitch on all sides except on top angle iron frame which shall be 50mm pitch. Holes for riveting shall be drilled and not punched. White lead shall be applied before riveting the surface to be jointed. The tanks shall conform to the Drawings.

13. Sanitary Fixtures And Accessories

i. Sanitaryware, accessories and Chrome Plated (CP) fittings shall be of the best quality, approved by the Employer. Whenever particular makes are mentioned, the choice or selection shall remain with the Employer.



ii. All fixtures and fittings shall be provided with all such accessories as required to complete the item in working condition whether or not specifically mentioned in the scope of work. Accessories shall include proper fixing arrangement, brackets, nuts,bolts, screws and required connection pieces.

iii. Fixing screws shall be found half round head chromium plated brass screws with C.P. washers where necessary.

iv. Porcelain Sanitaryware shall be glazed vitreous China of best Quality free from warps, cracks and glazing defects. Color of sanitaryware, when specified shall be selected by the Employer. Fixtures shall conform to I.S. 2556-1967.

v. Chromium plated fittings shall be cast brass chromium plated fittings of the best quality approved by the Employer.

vi. All fittings and fixtures shall be fixed in a neat workmanlike manner true to level at heights in accordance with the manufacturer's recommendations. Care shall be taken to fix all inlet and outlet pipes at correct positions. Faulty locations shall be made good and any damage to the finished floor, tiling or terrace shall be made good by the Contractor at his cost.

14. Orissa Pan

i. W.C. pan shall be 588mm long Orissa type or as specified in the scope of work. Each India W.C. shall be provided with one 100mm dia. porcelain "P" or "S" trap with vent with automatic flush system.

ii. The W.C. pan shall be fixed in a heat workmanlike manner. The W.C. and trap shall be set in cement concrete 1:2:4 mix. Joints between W.C. flush pipe shall be made with a putty of white lead and linseed oil and caulked well. Flushing cistern and flush pipe shall be painted with one coat or red lead and three coats of synthetic enamel paint of approved shade and quality.

15. European W.C.Set

i. European W.C. set shall be wash down set of single or double trap siphonic set with automatic flush system.

ii. Each W.C. shall be provided with one soling plastic seat with cover and of color as specified by the site Employer.

16. Asian W. C.

The W. C. shall be of white vitrious China Orrissa pattern with 100 mm dia H. C. C. syphon with vent arm S or P trap with ISI mark nit. The Orrisa pattern pan shall be fitted with C. P. flush valve of standard make.

17. Urinals

Urinals shall be standing type large flat pack of 610x400x360mm size. Each urinal shall be provided with one 32mm dia. chromium plated brass bottle trap with pipe to wall and wall flange. Urinals shall be fixed to wall by concealed hangers, brackets, C.P. screws as required and recommended by the manufacturers. Two automatic flushing cistern with cover of vitreous China with brackets shall be provided with five sets or urinals. Flush pipes shall conceal G.I. pipes sin wall with exposed pipes, chromium plated brass pipes with fitting and clamps exposed on wall.

18. Wash Hand Basin: Wash hand basin shall be of size specified by the Employer. These shall be fixed to wall by means of C.I. or M.S. Brackets. Wash hand basins shall have one 15mm C.P. waste with chain plug, 32mm C.P. bottle trap with C.P. pipe to wall and flange. The wash hand basin shall be securely fixed to the brackets by means of studs or lungs fixed on the brackets. The basins shall have 500mm long connector pipes with stop cocks at both inlets.

19. Mirror And Shower Sets

i. Mirror shall be of approved make 5.5mm thick. All edges shall be rounded off. Mirror shall be fixed on backing of 5mm thick commercial board and fixed to wall with brass chromium plated screws and washers. Mirrors shall be of bevelled or levelled edge of sizes as specified by the Employer and shall be clear when viewed from any directions.



ii. Shower set shall comprise of two 15mm dia. C.P. concealed stop cocks, 15mm inclined shower arm with flange and 60mm dia.shower rose with swivel joint. Concealed stop cocks shall be fixed at height of 1200 mm above finished floor level.

20. Miscellaneous White Glazed Fittings

White glazed fittings, e.g. toilet paper holders, soap dishes etc. shall be of white glazed vitreous China of the same color and shade as that of the main fittings. All fittings shall be fixed in wall in a neat workman like manner. Recess in walls, where required, shall be provided. All fittings shall be fixed with C.P. brass screws, where required.

21. Towel Rails

Towel rails shall be of C.P. brass with two brackets. The sizes of the call shall be as specified. The brackets shall be firmly fastened by means of C.P. brass screws to wooden plugs or rail plugs firmly embedded in the wall. Alternatively towel shall be fluted by aluminum towel rails with aluminum brackets.

22. Clamps

i. Holder get clamps shall be of standard design and fabricated from M.S. flat "with 12mm bolts and nuts. They shall be painted with two coats of bitumen paint before fixing. Holder bat shall be fixed in cement concrete in 1:2:4.

ii. Holder that clamps are to be fixed on RCC column, wall or beam. They shall be fixed with flat iron 'U' type clamps anchor fasteners of approved design. Rates for both types of clamps shall be the same and no addition shall be made. Structural clamps shall be fabricated from M.S. structural members e.g. rods, angles, channels, flats as per Employer's decision. Contractor shall provide all nuts, bolts, welding and painting the clamps with one cote of oxide.

23. Before commissioning and testing of fixtures, Contractor shall ensure that all soil waste stacks and drainage system are connected to the respective and the out fall sewer. He shall also ensure that the water supply system has been commissioned and tested. Fixtures shall be cleaned and all debris and dirt removed. All stickers, etc. shall be removed with hot water. Cold water shall be let in each fixtures individually. The fixtures shall then be observed for any leakage or drip at inlet and outlet connection. The rate of flow for each fixture shall be adjusted by control valves. All defective parts shall be replaced and retested. On satisfactory testing and commissioning of the fixtures, Contractor shall clean all fixtures and hand over in the absolutely clean and useable condition.

24. Necessary sceptic tank and soak pits shall be constructed by the contractor according to the instruction of the Employer. The measurement and payment of such works will be done as per the rate quoted in the BOQ under the relevant items.

14 WATER SUPPLY & SANITATION

14.1 Water Supply

1. This section covers the basic requirements for water supply and general requirement of plumbing connection to water supply to water systems from the approved water source at powerhouse site.

2. All pipe work shall be so laid or fixed and maintained as to be as to remain watertight thereby avoiding waste of water and the risk of contamination of water conveyed.

3. Underground piping shall be laid in such a way that it is unlikely to be damaged by frost or traffic loads and vibrations. Special precautions shall be taken to avoid damage to the piping by corrosion, water hammering. No bend shall be made abrupt to avoid friction loss.

4. The mains and pipes on site shall be laid in accordance with good standard practice. The work shall cover all materials required for such pipes & fittings. The work shall include line marking, level marking, excavation and laying filling with excavated materials, tying and clamping, jointing of pipes, groove cutting, fixing with couplings, T-bend, etc. complete with testing and ready for operation.



5. The pipes shall be galvanized mild steel seamless screwed and socketted tubes conforming to the requirements of IS: 1239-1938 or as approved by the Employer. All fittings for pipe shall be galvanised mild steel. All pipes shall be tested before use in laying. In general the pipe diameter shall be in the range of 15-100 mm as specified in the drawings or as directed by the Employer. Stop-cock, valve, etc. shall be of appropriate diameter and capacity made from gun metal of approved quality. Jointing of pipes shall be as per good practice and or as directed by the Employer.

6. The water tanks for reception and storage of water shall be of capacity given in drawings or as directed by the Employer. This tank shall be made of galvanised metal sheets of 18 BS gauge or polythene tank as directed by Employer. Storage tanks shall be provided with a stop valve or stop cock at every outlet other than overflow pipe, and shall be fitted with copper strainer. Outlet pipe shall be as per drawing or as directed by the Employer.

7. The setting and arrangement of pipes and service net work shall be prepared by the Contractor and all detail drawing shall be prepared and produced for the approval of the Employer. All pipes shall be completely concealed from view unless and until the requirements and as approved by the Employer. Water pipes are cut to size ends to be connected shall be threaded and screwed with sockets, joints of G.I. to make all of them completely water tight. All branching or bend shall be done with the help of T or U bends connected with couplings and sockets.

8. All pipe fittings, and appliances shall be inspected by the Contractor and shall produce the manufacturer's guarantee of the products. Any defective items shall be clearly marked as rejected and forthwith removed from the site. The Contractor shall inform the Employer for the check before laying. After laying and jointing, the main shall be slowly and carefully charged with water, so that all air is expelled from the main by providing with stop-cock, allowed to stand full of water for a few days, if time permits, and then tested under pressure. The test pressure shall be 5 kg/cm2 or double the maximum working pressure, whichever is greater. The test pump be manually operated or power driven. The testing shall be done joints opened. The service pipe shall then be inspected under working conditions of pressure and low when all draw off taps are closed, the service pipe shall be absolutely watertight.

9. Any control by the Employer shall not relieve the Contractor of his responsibility for the accuracy of the layout, fittings, or part of them with regards to their functions and quality.

14.2 Drainage

1. The Contractor shall carry out survey for the detail plan for the sanitary installation or drainage installation for approval to the Employer. The Contractor shall ascertain the Employer about the approximate level of subsoil water and flood level in relation to the sewer system and condition. All drainage system shall be designed by the Contractor and produced for approval to the Employer. The efficient and adequate system shall be proposed by the Contractor for approval of the Employer.

2. Drainage Pipe

Soil Pipes:- A soil pipe conveying to a drain any solid or liquid shall be circular and shall have a minimum diameter of 100 mm. The soil pipes shall be situated outside the building and shall continued upwards without diminution of its diameter to such height to open end a safe outlet for foul air ventilation.

3. Waste Pipe

Every pipe in building carrying off the waste or over-flow water from every bath-wash basin, sink to a drain shall be of diameter as per shown on drawings or directed by the Employer and trapped by an efficient syphon trap with adequate for inspection and clearing. The waste pipe shall be of cast iron fixed on by clamp as per requirements or as directed by the Employer.

The exposed pipes and fittings shall be painted with two coats of black enamel anti-corrosive paint.

4. All soil pipes, waste pipes, vent pipes, and all other pipes shall be approved by Employer. Smoke test may be conducted under pressure or 25 mm of water maintained for 15 minutes after all trap seals have been filled with water. Any leakage will be visible and the defective part of work shall be cut out and made good by the Contractor on his own cost.



5. Payment for water supply and sanitation will be made in Lump Sum prices stated in the Bill of Quantities when the Contractor has completed all the works specified in the specifications, drawings and as directed by the Employer. The price shall constitute full compensation for the cost of all labour, tools, equipments and materials including design, furnishing, construction, installation, testing, operation, maintenance and all other items necessary to complete the works.

15 ELECTRICAL INSTALLATION 1. The following specifications will apply under all circumstance to the equipments and fittings to be

supplied and installed against this Contract and it is to be insured that the Contractor shall obtain for himself at his own expense and his own responsibility all the purpose of making the Tender and for entering into a Contract keeping in view the specifications detailed hereunder.

The Tender rates shall include for the cost of material, erection, connection, testing and commissioning, supervision, transport, tools, all taxes, breakage, wastage, sundries, scaffolding, and maintenance of installation works for guarantee period of one year, etc.

2. The scope of work under this Contract shall under due consideration of the requirements as stipulated in the specification include;

i. Supply and wiring of Light and Power points with PVC insulated copper conductor cables in a concealed HDP pipe in wall, ceiling and floors as shown on the drawings or as directed by the Employer.

ii. Supply and erection of Main Switch & Sub Distribution Boards as shown on drawings or as directed by the Employer.

iii. Supply and fixing of lighting fixtures, power sockets, switches, etc. as per drawings or as directed by the Employer.

iv. Supply and embedding of Earthing Materials and connections to Main Switch & Sub Distribution Boards with bare copper conductor in concealed HDP Pipe wherever applicable.

v. Excavation, backfill, cutting and patching, brick-work and concrete work, sleeves, inserts, anchors, etc. as required for proper installation in accordance with the requirements, drawings and specifications or as directed by the Employer.

vi. Testing and commissioning of the electrical equipments including Main Switch and Sub Distribution Boards, lighting fixtures and power sockets, etc.

vii. Where the electrical work is associated with the work of the others, the Contractors shall confer with the persons affected and shall furnish them with all necessary information, drawings, dimensions, etc. and shall coordinate the electrical work with the work of other trades to insure a satisfactory installation, in accordance with the drawings and specification and with the high standards of trade practices based on IS code of practice or approved equivalent.

3. General Requirement

i. All fittings, accessories and appliances shall conform to relevant British, Indian or approved other standards whichever applicable.

ii. All wiring shall be installed in accordance with British, Indian or approved other standards and shall be conduit wiring or as instructed by the Employer.

iii. The system shall have 230 V, 50 Hz, single phase two wire AC supply or 400 V, 50 Hz, three phase four wire AC supply whichever applicable as per drawing or as instructed by the Employer.

iv. The notation R, Y and B in the three phase system indicate three different phases to be connected in the circuits and phases should be strictly followed.

v. The incoming section of three phase main distribution board shall be provided with suitable barriers to maintain phase segregation.

vi. All electrical fittings and wiring accessories shall be installed in accordance with IS-1963 or approved equivalent.



vii. The system should provide ease to fittings for maintenance and repair and for any possible modification to the system.

viii. There shall be two distinct circuits, one for lights and the other for power appliances.

ix. Prior to the installation of the lighting and plug points and distribution boards, switches, etc. final positions shall be ascertained by the Contractor with the Employer.

4. Payment for electrification will be made in lump sum prices stated in the Bill of Quantities when the Contractor has completed the whole work as specified in the specification, shown on the drawings and as directed by the Employer. The price shall constitute full compensation for the cost all labour, tools, equipments and materials including design, furnishing, construction, installation, testing, operation, maintenance and all other necessary accessories to complete the work.

16 SCOPE OF WORK & BOQ This clause mentions the Building Schedules that shall be used with the accompanying Specification Sections to define the scope of work requirements along with the specificatoins as specified in the drawings or as directed by the Employer.

The details are attached in Annex 1

Documents

Specification Siuri Camp Construction