DescriptionPreprufe® waterproof membranes arecomposite sheets comprising a robustHPDE backing, a pressure sensitiveadhesive and a trafficable weatherresistant coating.

Uniquely, the membrane develops acontinuous adhesive bond to concretepoured against it. This prevents watermigration between the structure and themembrane, substantially reducing therisk of leaks.

Applications• Water and vapour proofing all

basement grades to BS 8102:1990.

• Waterproofing civil engineering sub -structures.

• Methane, carbon dioxide and radongas protection in excess of thestandard membrane requirements inBRE Reports 211 (Radon) and 212(Methane and Carbon Dioxide).

Independent Assessments• BBA Certificate No. 97/3325.

• Mott MacDonald Special ServicesReport May 2001.

• International Certifications.

Advantages• Versatile - can be used beneath

foundation slabs and with single ordouble-sided formwork systems.

• Seals adhesively to concrete - theonly technology proven to resistwater migration.

• Lightweight, flexible - easy to handleand install without special cornerpieces.

• No butt joints - all joints havebonded ‘selvedge’ or Preprufe Tapeoverlaps for increased leakprotection.

• Inert - unaffected by groundwatercontaminants, ponded water orwet/dry cycling.

• Remains sealed to structure - even ifground settles.

• Smooth surface membrane - sitecontamination easily removed.

• Excellent chemical resistance -protects structure from salts andsulphate attack.

• Total system - Full range of Gracehydrophilic and PVC waterstopsavailable for concrete jointprotection.

System Components• Preprufe® 160R - used typically with

concrete slab sections up to 350 mmthickness and vertically with singleand double sided formwork systems.

• Preprufe® 300R - used typically withconcrete slab sections greater than350 mm thickness. Superior damageresistance.

• Preprufe® Tape - incorporatingPreprufe coating for continuousconcrete adhesion at taped edges anddetails.

• Bituthene® LM - high performanceliquid membrane for detailingterminations at pile caps and pipepenetrations.

• Adcor® 500S - hydro-expansivewaterstop for concrete constructionjoints.

Details shown are typical illustrations only andnot working drawings. For assistance withworking drawings and additional technical

advice please contact Grace Technical Services

Watertight and grout tightsealed laps

Slab formwork

Selvedge lap

Adhesive surface ofPreprufe membrane

Bituthene LM

CERTIFICATE No. AGREMENT

97/3325

Preprufe Tape

Preprufe®

Cl/SfB

19 Ln2

Ref. WM001D 05/06

w w w . g r a c e c o n s t r u c t i o n . c o m

Pre-applied waterproof membranes that develop an adhesivebond to poured concrete to prevent water migration. For usebelow slabs and on basement walls.

Substructure Waterproofing - Membranes

Adcor 500S

EN 13967

ApplicationMaterial Storage Sequence deliveries to avoid delays, butminimise on-site storage. Select a safe,covered secure location for materialstorage. Store materials for each day’s usein a location that won’t require movementa second time. Do not double-stack palletsof waterproofing on the job site. Storeprotection boards flat and off the ground.Provide cover on top and all sides.

Substrate PreparationSuitable substrates include:

• concrete blinding• well compacted sand on rolled

crushed stone• rigid insulation• clay heave boards• permanent formwork• removable formwork• 19 mm plywood• Hydroduct drainage sheets• Adjacent sub-structures

Substrates should be uniform with nogaps or voids greater than 12mm. Wherethese exist fill with a material ofsufficient strength to support themembrane. All substrates must be free ofloose aggregate and sharp protrusions.Where possible, avoid sloping or roundedconcrete blinding.

In crushed stone applications, it isimportant to create a sound and solidsubstrate around “through slab”penetrations to eliminate movementduring the concrete pour. Excessivemovement may jeopardise thewaterproofing integrity around thepenetration. Grout around thepenetration prior to installing themembrane for stabilisation.

The surface does not need to be dry, butstanding water must be removed.Substrates must have sufficient rigiditynot to move during the concrete pour.Boarded substrates must be close buttedto provide support and not more than 12 mm out of alignment.

Installation - General Tools /materials required:Heavy duty lap rollerStanley /Utility knivesTape measureCotton cleaning clothsPlywood or similar cutting boardThin metal straight edgeChalk lineBroom2 metre long pipe or heavy broom handleHot air heat gunGrace MR2 paddle for mixing Bituthene LMRound nose trowel or spatulaRequired protection and/or drainageboards and other ancillary products

Preprufe membranes are supplied in rolls1.2m wide with a self adhesive selvedgeon one edge to enable fully bonded lapsbetween adjacent rolls. All other lapsmust be taped with Preprufe Tape.

Minimum application temperature +5ºC.

When installing Preprufe in cold ormarginal weather conditions (<13°C) theuse of Preprufe Tape LT is recommendedat all laps and detailing. Preprufe TapeLT should be applied to clean drysurfaces and the release liner must beremoved immediately after application.

Installation - Horizontal

Place the membrane with the removeableplastic release liner uppermost. End lapsshould be staggered to avoid a build upof layers. Leave plastic release liner inposition until overlap procedure iscompleted. Accurately position

subsequent sheets to overlap the previoussheet 75mm along the selvedge. Ensurethe underside of the succeeding sheet isclean, dry and free from contaminationbefore attempting to overlap. Peel backthe plastic release liner from between theoverlaps as the two layers are bondedtogether. Ensure a continuous bond isachieved without creases and roll firmly.On completion of the installation, ensurecomplete removal of the plastic releaseliner from all membrane and tape.

End Laps and Cut Edges Overlap all roll ends and cut edges by aminimum 75mm and ensure the area isclean and free from contamination,wiping with a damp cloth if necessary.Allow to dry and apply Preprufe Tapecentred over the lap and roll firmly. Referalso to Preprufe Standard Details.

CornersInternal and external corners should be formed as shownin the diagrams returning the membrane a minimum of100mm and sealing with Preprufe Tape. Ensure that theapex of the corner is covered and sealed with Tape androll firmly. Crease and fold the membrane to ensure aclose fit to the substrate profile and avoid hollows.

External

3

4

1

2

3

2

Internal

fold

fold

PreprufeTape

Internal & External Corners Internal & external corners should beformed as shown in the diagrams below.Ensure that all laps are 100 mmminimum, taped with Preprufe Tape andwell rolled. Crease and fold themembrane to ensure a close fit to thesubstrate profile.

Penetrations To seal around penetrations such asservice pipes, pile heads, lightningconductors, etc. mark and cut membranetight to the penetration. If the membraneis not aligned within 12mm of thepenetration, apply Preprufe Tape lappedonto the membrane and butted tight tothe penetration. For pipe penetrations,wrap the pipe with Preprufe Tape. Mixand apply Bituthene LM around thepenetrations using a fillet to provide awatertight seal between the Preprufemembrane and Tape. Refer also toPreprufe Standard Details.

Membrane Repair Inspect the membrane for damage beforeinstallation of reinforcement steel,shuttering and final placement ofconcrete. Clean by jet washing ifrequired.

Wipe the area with a damp cloth toensure the area is clean and free fromdust, and allow to dry. For minor repairs,

apply Preprufe Tape centrally over thedamaged area and roll firmly. For largerrepairs use a patch of Preprufe and tapeall edges with Preprufe Tape. Removeplastic release liner from Tape.

Where exposed selvedge has lostadhesion or laps have not been sealed,ensure the area is clean and dry andoverband with Preprufe Tape and rollfirmly.

Installation - Vertical Apply the membrane with the thick whiteplastic face against the substrate.Mechanically fasten the membranevertically using flat headed fixingsappropriate to the substrate. Themembrane may be installed in anyconvenient length. Secure the top of themembrane using a batten or fixing 50mmbelow the top edge. Use fixings attypically 600 mm centres to secure themembrane flat against the substrate.Fixings can be made through theselvedge, this allows firmly rolledoverlaps, which are covered by thesubsequent strip of Preprufe. Anyexposed fixings should be patched withPreprufe Tape. Ensure the underside of

the succeeding sheet is clean, dry and freefrom contamination before attempting tooverlap. Peel back the plastic release linerfrom between the overlaps as the two layersare bonded together. Ensure a continuousbond is achieved without creases and rollfirmly. On completion of the installation,completely remove the plastic releaseliner from all membrane and tape.

Formwork LiningPreprufe can be pre-applied to verticalformwork. Contact Grace for furtherguidance.

Removal of Formwork Preprufe membranes can be applied toremovable single and double sidedformwork, slab perimeter formwork, pilecaps, etc. Once concrete is poured theformwork must remain in place until theconcrete has gained sufficientcompressive strength to develop thesurface bond with Preprufe.

A minimum concrete compressivestrength of 10 N/mm2 is recommendedprior to stripping formwork supportingPreprufe membranes. Premature strippingmay result in loss of adhesion betweenthe membrane and concrete.

Wall Waterproofing Options Grace also offers alternatives to pre-applying Preprufe to vertical formwork.

For conventional application to wallsafter formwork removal use either:

• Bituthene® 8000 - self adhesive sheetwaterproofing membrane

• Procor® 75 - spray applied liquidwaterproofing membrane.

Selection of the most cost-effectivesolution will depend on the constructionprogramme, type of formwork system,wall height etc.

See separate data sheets for furtherinformation.

Preprufe Preparation WhenBituthene Is Used on Walls Inspect the Preprufe around the perimeteredge of the concrete slab. Identify anyexposed non-selvedge overlaps inPreprufe. To ensure continuity of thefully bonded system, carefully cut andremove a 75 mm triangular piece of thetop flap of Preprufe only, as shownshaded in the standard detail, SlabPerimeter Detail - non selvedge lap’.

Bituthene 8000 post applied to walls inconjunction with Preprufe below slabs

Do not primePreprufeR with

B2 Primer

Bituthene 8000 onprimed concrete

surface

Preprufe

BitutheneLM

Adcor500S

75 mm overlap

75 mm

Taped non-selvedge lapPoured ConcreteRemove formworkCut and remove shaded piece beforeapplying Bituthene

1234

1

2

4

Slab Perimeter Detail

Ancillary ProductsAdcor® 500SHydrophilic waterstop for constructionjoints and pipe entries.

AT System - Co-extruded PVCwaterstops for movement joints.

Bituthene Protection Board - protectionagainst damage from backfill.

Limitations of Use• Do not use Preprufe between concrete

infilled hollow block walls.

• It is recommended that concrete bepoured within 56 days (42 days in hotclimates) of application of themembrane.

NBS Specification ClauseRefer to clause J40 297

Health & SafetyThere is no requirement for a MaterialSafety Data Sheet for Preprufe. Forhealth and safety questions on thisproduct please contact Grace.

For Bituthene LM, read the product labeland Material Safety Data Sheet (MSDS)before use. Users must comply with allrisk and safety phrases.

MSDS’s can be obtained from GraceConstruction Products or from our website at www.graceconstruction.com.

Typical Properties

Supply

Preprufe® 300R 160R Tape LT* or HC*

Thickness (nominal) 1.2 mm 0.8 mm 0.7 mm

Roll size 1.2 x 30.0 m 1.2 x 35.0 m 100 mm x 15.0 m

Roll area 36.0 m2 42 m2

Roll weight 50 kgs 42 kgs 2 kgs

Minimum edge/end laps 75 mm 75 mm 75 mm

*LT denotes for temperature between -40C and +300C

*HC denotes for temperature between +100C and +400C

Ancillary ProductsAdcor® 500S 5 m rolls

Bituthene® LM 5.7 litre

Paddle MR2 (80mm dia) for mixing UnitLap Roller Unit

Preprufe 300R Preprufe 160R

Thickness (mm) 1.2 0.8

Adhesion to concrete (N/mm) 2.88 2.88

Shear strength of joints (N/mm) 9.52 9.52

Hydrostatic head resistance (m)ASTM D 5385 mod.

> 70 > 70

Water resistance (EN 1928)

Water vapour transmission rate(g/m2/24 hrs)

0 0

Methane permeability (mls/m2/24 hrs)

9.1 34.8

Radon transmission (m/s) <21 x 10-9 21 x 10-9

Puncture resistance (N) 990 445

Adcor, Aerofil, BETEC, Bituthene, Hydroduct, Insupak, Korkpak, Paraflex, Paraseal, Preprufe, Procor, Servicised, Servidek, Servigard, Servijoint, Servimastic, Servipak,Servirufe, Serviseal, Servistrip, Servitite, Vertigard and Vertiseal are registered trademarks of W R Grace & Co.-Conn.Adprufe, Armourtape, Bitushield, Bitustik, Bitutape, Hydropaste, Pak Adhesive, PVC Edgetie, Serviband, Serviflex, Servitape, Slipstrip, and Solarshield are trademarksof W R Grace & Co.-Conn.

The information given is based on data and knowledge considered to be true and accurate and is offered for the user’s consideration, investigation and verification. Since the conditions of use are beyond ourcontrol we do not warrant the results to be obtained. Please read all statements, recommendations or suggestions in conjunction with our conditions of sale including those limiting warranties and remedieswhich apply to all goods supplied by us. No statement, recommendation or suggestion is intended for any use which would violate or infringe statutory obligations or any rights belonging to a third party.Copyright 2006. Grace Construction Products Limited. Printed in England - 05.06- Ref. WM001D

Grace Construction Products Ltd, Ajax Avenue, Slough, Berkshire SL1 4BH United Kingdom Tel +44 (0)1753 692929 Fax +44 (0)1753 691623

Visit our web site at www.graceconstruction.com

pass at 60 kPa