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2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 1
2015 IRC Transition from the 2009 IRC2015 IRC Transition from the 2009 IRCBased on the International Residential Code® (IRC®)
Marginal Markings in the IRCMarginal Markings in the IRC
2
▌ solid vertical line technical change
arrow deletion
* single asterisk relocated elsewhere
** double asterisk relocated here
Errata – iccsafe.org/errata-central/Errata – iccsafe.org/errata-central/ iccsafe.org/
errata-central/
Errata page
3
Scope and Administration (Chapter 1) Scope and Administration (Chapter 1)
Part 1
4
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 2
R 101.2, R202 Scope – Accessory StructuresR 101.2, R202 Scope – Accessory Structures
Maximum height from 2 to 3 stories
Technical requirements removed from definition
Unlimited in area
2015 IRC Transition from the 2009 IRC 5
2015 R104.11 Alternative Materials, Design, and Methods of Construction and EquipmentR104.11 Alternative Materials, Design, and Methods of Construction and Equipment
Reason for disapproval in writing by the building official.
2015 IRC Transition from the 2009 IRC 6
2015
R105.2 Fences Exempt from PermitR105.2 Fences Exempt from Permit• Fences ≤ 7 feet high
2015 IRC Transition from the 2009 IRC 7
2012 R105.3.1.1 Existing Buildingsin Flood Hazard AreasR105.3.1.1 Existing Buildingsin Flood Hazard Areas
Determination of substantial improvement by building official
Related provisions consolidated in R105.3.1.1.
2015 IRC Transition from the 2009 IRC 8
2015
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 3
R106.1.4 Information for Construction in Flood Hazard AreasR106.1.4 Information for Construction in Flood Hazard Areas Construction documents
for Coastal A Zones Special hazard area landward
of V Zone (wave < 3 ft.) Include elevation of the bottom
of lowest horizontal structural member
Same as high hazard Zone V R322.3 Coastal high-hazard
areas
2015 IRC Transition from the 2009 IRC 9
2015
Building Planning (Chapter 3)Building Planning (Chapter 3)
Part 2
10
Table R301.2(1) Climatic and Geographic Design CriteriaTable R301.2(1) Climatic and Geographic Design Criteria The jurisdiction must indicate if it contains
special wind regions or wind borne debris zones
2015 IRC Transition from the 2009 IRC 11
2015Wind Design Criteria Wind Design Criteria 2012 IRC 2015 IRC R301.2.1 R301.2 A new map indicates the geographic locations that require wind design.
Ultimate design wind speed values replace basic wind speed values
2015 IRC Transition from the 2009 IRC 12
2015
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 4
R301.2 Wind Speed MapsR301.2 Wind Speed MapsFigure R301.2(4)B Regions Where Wind Design Is Required >140 mph Vult non-hurricane areas (108 Vasd) >130 mph Vult hurricane areas (101 Vasd)
132015 IRC Transition from the 2009 IRC
2015R301.2 Wind Design CriteriaR301.2 Wind Design Criteria Location-specific wind speed values Applied Technology Council windspeed.atcouncil.org IRC: Use Risk Category II
142015 IRC Transition from the 2009 IRC
2015
R301.2 Wind Design CriteriaR301.2 Wind Design Criteria Cedar Rapids / Iowa City area ASCE 7-10 Risk Category II 115 mph Ultimate Design Wind Speed
152015 IRC Transition from the 2009 IRC
2015 R301.2.1.1.1 Sunrooms R301.2.1.1.1 Sunrooms R301.2.1 Wind design
criteria Sunrooms to comply
with AAMA/NPEA/NSA 2100-12.
Habitable and non-habitable
Conditioned and unconditioned
2015 IRC Transition from the 2009 IRC 16
2015
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 5
R301.2.1.2 Protection of Openings in Wind Borne Debris RegionsR301.2.1.2 Protection of Openings in Wind Borne Debris Regions Prescriptive attachment
provisions for wood structural panels:
Mean roof height limit increased from 33 to 45 ft.
To permit on 3-story buildings
2015 IRC Transition from the 2009 IRC 17
2015 R301.2.1.4 Wind Exposure CategoryR301.2.1.4 Wind Exposure Category Wind Exposure Category A deleted Wind Exposure Category D: Unobstructed areas ≥5,000 ft.: Open water Mud and salt flats Unbroken ice fields Includes hurricane-prone regions.
2015 IRC Transition from the 2009 IRC 18
2015
R301.3 Story Height R301.3 Story Height Story height 11 ft 7in.: Wood and steel wall
framing Insulated concrete SIP walls
Masonry wall height is limited to 13 ft 7in.
2015 IRC Transition from the 2009 IRC 19
2015
11 ft. 7 in. Max.
Story height
Story height
R302.1 Exterior WallsR302.1 Exterior Walls2012 IRC 2015 IRCR302.1 R302.1 Separate tables
depending on sprinklers 3 ft separation with
sprinklers 5 ft without
Footnote a
• Overhangs:• Exception when
fireblocking is installed between the top of the wall and the roof sheathing
• Penetrations of exterior walls ≥3 ft do not require fire-resistant protection
2015 IRC Transition from the 2009 IRC 20
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 6
R302.1 Exterior WallsR302.1 Exterior Walls
21
Modification: Minimum clearances to lot lines
No
Sprinklers Sprinklers
Sprinklers in All
Dwellings and 6-foot
Setback on Adjoining Lot
Unrated
Exterior
Wall
5 feet 3 feet 0 feet
2015 IRC Transition from the 2009 IRC
2012 R302.1 Exterior WallsR302.1 Exterior Walls
2015 IRC Transition from the 2009 IRC 22
2015
R302.2 Townhouse SeparationR302.2 Townhouse Separation
2012 IRC 2015 IRCR302.2.2 R302.2
Parapet exception:• No roof openings or
penetrations within 4 ft of the separating wall
Common walls separating townhouses:• 2 hrs without sprinklers• 1 hr with sprinkler system
2015 IRC Transition from the 2009 IRC 23
R302.2.2 Parapet ExceptionR302.2.2 Parapet Exception
24
Page 23
2012
2015 IRC Transition from the 2009 IRC
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Copyright 2015 International Code Council 7
R302.2Townhouse SeparationR302.2Townhouse Separation
2015 IRC Transition from the 2009 IRC 25
Common 1-hourfire-resistance-ratedwall continuousfrom foundation toroof sheathing
Common 2-hourfire-resistance-ratedwall continuousfrom foundation toroof sheathing
Townhousedwelling unit A
One-hour common wall for townhouses with sprinklers Two-hour common wall for townhouses without sprinklers
Townhousedwelling unit B
Townhousedwelling unit A
Townhousedwelling unit B
Electrical installations arepermitted in common wall.Electrical boxes must meetfire-resistant penetrationrequirements.
No plumbing,mechanical,ducts, or vents–in common wall
2015 R302.5.1 Garage Opening ProtectionR302.5.1 Garage Opening Protection Self-closing device on
door between garage and dwelling
2015 IRC Transition from the 2009 IRC 26
2012
Fire Protection of FloorsFire Protection of Floors2012 IRC 2015 IRCR302.13 (R501.3) R302.13 • Underside of floor
assembly• ½” gypsum board or • ⅝” wood structural panel or• equivalent material
• Exceptions• ≥ 2 ×10 dimension or SCL• Sprinklers below• ≤ 80 sq. ft. area• Crawl space with no fuel
fired appliances
• Moved from Chapter 5 to the fire-resistant construction provisions of Section R302.
• Does not regulate penetrations or openings in membrane.
2015 IRC Transition from the 2009 IRC 27
R302.13 Fire Protection of FloorsR302.13 Fire Protection of Floors
2015 IRC Transition from the 2009 IRC 28
2015
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Copyright 2015 International Code Council 8
R303.1, R303.3Mechanical VentilationR303.1, R303.3Mechanical Ventilation Mechanical ventilation must comply with new
Section M1507.3 whole-house ventilation of habitable rooms local exhaust of bathrooms
Section R202 Definitions whole-house mechanical ventilation system local exhaust
2015 IRC Transition from the 2009 IRC 29
2012
30
R303.4Mechanical ventilationR303.4Mechanical ventilation Whole-house mechanical
ventilation system required if tested with a blower door
test and air infiltration rate < 5 ACH N1102.4.1.2: Blower door
test required
2012
2015 IRC Transition from the 2009 IRC
R303.5 Ventilation Intake OpeningsR303.5 Ventilation Intake Openings The minimum vertical clearance between a
contaminant source and an outdoor air intake below has increased from 2 feet to 3 feet.
2015 IRC Transition from the 2009 IRC 31
2012 R303.7, R303.8 Stairway IlluminationR303.7, R303.8 Stairway Illumination Interior and exterior in
separate sections Interior to illuminate
treads and landings Exterior light source
at top landing Bottom landing
accessing basement
2015 IRC Transition from the 2009 IRC 32
2015
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 9
R304.1 Minimum Habitable Room AreaR304.1 Minimum Habitable Room Area
Deletes 120 square feet minimum area
2015 IRC Transition from the 2009 IRC 33
2015 R305Ceiling HeightR305Ceiling Height 6 feet 8 inches: Bathrooms Toilet rooms Laundry rooms
6 feet, 4 inches all basements: Beams Girders Ducts Other obstructions
2015 IRC Transition from the 2009 IRC 34
2015
R308.4 Hazardous Locations for GlazingR308.4 Hazardous Locations for Glazing
Reorganization Each item in a separate
subsection with title
2015 IRC Transition from the 2009 IRC 35
2012
2006 201211 items 7 subsections10 exceptions
R308.4.2 Glazing Adjacent to DoorsR308.4.2 Glazing Adjacent to Doors Glazing installed
perpendicular to a door < 24 inches from door Safety glazing if on hinge
side of an in-swinging door
2015 IRC Transition from the 2009 IRC 36
2015
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 10
Glazing and Wet SurfacesGlazing and Wet Surfaces2012 IRC 2015 IRCR308.4.5 R308.4.5• Combines provisions
• tubs • swimming pools
• “in walls … facing … bathtubs, showers …”.
• Not safety glazing when ≥ 60 in. from edge of
• Shower• Sauna• Steam room
2015 IRC Transition from the 2009 IRC 37
R308.4.6 Glazing Adjacent Stairs and RampsR308.4.6 Glazing Adjacent Stairs and Ramps
Stairs and ramps Intermediate landing 36 in. height
2015 IRC Transition from the 2009 IRC 38
2012
R308.4.7 Glazing Adjacent to the Bottom Stair LandingR308.4.7 Glazing Adjacent to the Bottom Stair Landing2012 IRC 2015 IRCR308.4.7 R308.4.7 36 in height. Area in front of the plane of the
bottom tread.
2015 IRC Transition from the 2009 IRC 39
R309.5 Garage Fire SprinklersR309.5 Garage Fire Sprinklers
Not required unless: Nonrated exterior wall of
garage constructed on lot line when: Sprinklers in garage Sprinklers for all homes in
subdivision 6-foot setback on adjacent lot
2015 IRC Transition from the 2009 IRC 40
2012
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 11
R310 Emergency Escape and Rescue OpeningsR310 Emergency Escape and Rescue Openings Reorganized Separate provisions
for windows and doors Less precise sill height
measurement Grade floor or below
grade openings 5.0
2015 IRC Transition from the 2009 IRC 41
2015 R310.2.2 EEROWindow Well DrainageR310.2.2 EEROWindow Well Drainage Window wells serving
emergency escape and rescue openings
Direct surface water to the foundation drainage system
Except for locations with well-drained soils
2015 IRC Transition from the 2009 IRC 42
2012
R310.5, R310.6 Emergency Escape and Rescue Openings for Additions, Alterations and Repairs
R310.5, R310.6 Emergency Escape and Rescue Openings for Additions, Alterations and Repairs No additional
emergency escape and rescue openings: Basement addition with
access to an emergency escape and rescue opening
Alterations or repairs to an existing basement unless new bedroom
2015 IRC Transition from the 2009 IRC 43
2015 R311.7.3, R311.7.5.1 Stair RisersR311.7.3, R311.7.5.1 Stair Risers Vertical rise in stairway
without intermediate landing increased from 144 to 147 in.
Open risers based on distance above grade or the floor below (not total rise)
Open risers permitted on spiral stairways
2015 IRC Transition from the 2009 IRC 44
2015
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 12
R311.7.6 Landing for StairwaysR311.7.6 Landing for Stairways Angular and curved
stair landings At a turn in a
stairway
2015 IRC Transition from the 2009 IRC 45
2012 R311.7.10.1 Spiral StairwaysR311.7.10.1 Spiral Stairways Definition omits requirement for center post to allow for
design flexibility Limits the radius at the walkline ≤ 24 in. Measurement for tread depth now matches the winder
provisions Measures at the intersection of the walkline and the tread
nosings rather than perpendicular to the leading edge of the tread
6 ¾ in. vs. 7 ½ in.
2015 IRC Transition from the 2009 IRC 46
2015
R311.7.10.1Spiral Stairways
R311.7.10.1Spiral Stairways
472015 IRC Transition from the 2009 IRC
2015R311.7.11, R311.7.12 Alternating Tread Devices and Ship LaddersR311.7.11, R311.7.12 Alternating Tread Devices and Ship Ladders
Added to the stair provisions. Neither approved for use as a
means of egress.
2015 IRC Transition from the 2009 IRC 48
2015
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 13
R311.7.12 Ship LaddersR311.7.12 Ship Ladders Tread Depth ≥ 5 in. Projected tread
depth ≥ 8 ½ in. Riser height ≤ 9½ in. Net width ≥ 20 in. Handrail 30 – 34 in.
49
2015
2015 IRC Transition from the 2009 IRC
R311.8 RampsR311.8 Ramps Ramps that serve the
required egress door: 1:12 slope Unless infeasible
Other ramps: 1:8 slope
2015 IRC Transition from the 2009 IRC 50
2015
R312.1.2 Guard HeightR312.1.2 Guard Height Deletes provision for
measuring guard height from surface of adjacent fixed seating
2015 IRC Transition from the 2009 IRC 51
2015Window Fall ProtectionWindow Fall Protection2012 IRC 2015 IRCR312.2 R312.2
• Relocated from R612.2 to R312.2
• ASTM F 2090• Window opening
control devices• Window fall prevention
devices
• Revised to clarify the meaning
• Remove redundant language
• Achieve consistency with the IBC provisions.
2015 IRC Transition from the 2009 IRC 52
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 14
Smoke AlarmsSmoke Alarms2012 IRC 2015 IRCR314 R314
• Recognizes wireless technology for interconnection
• Separate sections for:• Location• Power source• Interconnection
• Battery-operated permitted for alterations, repairs, and additions
• Addresses alarms installed near bathrooms and cooking appliances
• Household fire alarm systems no longer require monitoring by an approved supervising station.
2015 IRC Transition from the 2009 IRC 53
R314Smoke AlarmsR314Smoke AlarmsR314.3 Location
4. ≥ 3 ft horizontally from door of a bathroom
R314.3.1 Minimum distance from cooking appliances
Type of alarm Separation
Ionization 20 ft
Ionization with alarm-silencing switch 10 ft
Photoelectric 6 ft
54
2015
2015 IRC Transition from the 2009 IRC
Carbon Monoxide AlarmsCarbon Monoxide Alarms2012 IRC 2015 IRCR315 R315
• Recognizes carbon monoxide detection systems with separate detectors and notification appliances
• Per NFPA 720.
• Connection to house wiring with battery backup
• Exterior work no longer triggers CO alarm provisions for existing buildings
• Attached garage only considered if communicating with dwelling
• CO alarm in bedroom with fuel-fired appliance in the bedroom or adjoining bathroom
• CO detection systems only require detectors in locations prescribed by the code (not NFPA 720)
2015 IRC Transition from the 2009 IRC 55
R325MezzaninesR325Mezzanines Mezzanine. An
intermediate level or levels between the floor and ceiling of any story.
Limitations on ceiling height and openness consistent with the International Building Code (IBC).
2015 IRC Transition from the 2009 IRC 56
2015
2015 IRC Transition from the 2009 IRC
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R326 Swimming Pools, Spas and Hot TubsR326 Swimming Pools, Spas and Hot Tubs The design and
construction of pools and spas shall comply with the International Swimming Pool and Spa Code (ISPSC).
Appendix G Swimming Pools, Spas and Hot Tubs
2015 IRC Transition from the 2009 IRC 57
2015
Building Construction (Chapters 4-10)Building Construction (Chapters 4-10)
Part 3
58
R403.1.1 Minimum Footing SizeR403.1.1 Minimum Footing Size Expanded tables Type of structure
Light frame Veneer Concrete
Type of foundation Slab on grade Crawl space Basement
Expanded tables Roof snow load 32-ft. wide house No. of stories
2015 IRC Transition from the 2009 IRC 59
2015 R403.1.1 Minimum Footing SizeR403.1.1 Minimum Footing Size
2015 IRC Transition from the 2009 IRC 60
2015
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 16
Minimum Required FootingMinimum Required Footing Two-story house with slab on grade
foundation: Light-frame construction Soil-bearing strength @ 1500 psf Roof Live Load @ 20 psf 32ft. wide building with interior load-bearing wall
612015 IRC Transition from the 2009 IRC
R403.1.3 Footing and Stem Wall Reinforcing in Seismic Design Categories D₀, D₁, and D₂R403.1.3 Footing and Stem Wall Reinforcing in Seismic Design Categories D₀, D₁, and D₂
Defines required reinforcing
Updated figures
2015 IRC Transition from the 2009 IRC 62
2015
R403.1.6Foundation AnchorageR403.1.6Foundation Anchorage Anchor bolts in the middle
third of sill plate Measured to edge of bolt (Optimum 1¾ in.)
632015 IRC Transition from the 2009 IRC
R404.1.9 Isolated Masonry PiersR404.1.9 Isolated Masonry Piers Prescriptive provisions for isolated masonry pier
foundations supporting raised floor systems
2015 IRC Transition from the 2009 IRC 64
2012
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 17
R404.4 Retaining WallsR404.4 Retaining Walls Retaining walls > 24 48 in. of unbalanced backfill
designed in accordance with accepted engineering practice (consistent with R404.1.3)
> 24 in. if resisting additional lateral loads Freestanding walls not supported at top Not supporting buildings
2015 IRC Transition from the 2009 IRC 65
2015 R405.1 Foundation DrainageR405.1 Foundation Drainage A filter membrane
is now required for perforated foundation drains
2015 IRC Transition from the 2009 IRC 66
2012
Tables R502.3.1(1), R502.3.1(2) Floor Joist Spans for Common Lumber SpeciesTables R502.3.1(1), R502.3.1(2) Floor Joist Spans for Common Lumber Species
Span lengths Decreased for
Southern Pine Increased for DFL and
HF
2 X 10 Floor JoistsDead load = 10 psfLive load = 40 psf16 in. o.c. spacing
2015 IRC Transition from the 2009 IRC 67
2015
Spans 2012 2015#2 SP 16 - 1 14 - 0#2 DFL 15 - 5 15 - 7#2 HF 15 - 2 15 - 2
#1 SP: 16 – 1 in 2015
R502.10 Framing of Floor OpeningsR502.10 Framing of Floor Openings Header joist and
trimmer connections deleted
This section conflicted with Section R502.6, which contains minimum bearing lengths for all joists and headers.
2015 IRC Transition from the 2009 IRC 68
2015
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 18
R507 DecksR507 Decks2012 IRC 2015 IRCR507, R507.2 R507.2
• New section for all deck provisions
• Prescriptive provisions for deck ledger attachment revised to correlate with the National Design Specifications (NDS) for Wood Construction.
• Deck Ledger Connection to Band Joist• Clarified• Reorganized• Removes conflicting
and redundant language
2015 IRC Transition from the 2009 IRC 69
R507.2.4 Alternative Deck Lateral Load ConnectionR507.2.4 Alternative Deck Lateral Load ConnectionOptional Connections Figure 507.2.3(1): Two hold-down devices ≤ 2 ft of the ends of the deck
Figure 507.2.3(1): Four hold-downs
installed below the deck structure
2015 IRC Transition from the 2009 IRC 70
2015
R507.4DeckingR507.4Decking Max. deck joist
spacing for common decking materials
2015 IRC Transition from the 2009 IRC 71
2015 R507.5, R507.6, R507.7Deck Joists and BeamsR507.5, R507.6, R507.7Deck Joists and Beams Prescriptive methods for joists and beams in deck
construction. Spans & bearing requirements
2015 IRC Transition from the 2009 IRC 72
2015
2015 IRC Transition from the 2009 IRC
Copyright 2015 International Code Council 19
R507.8 Deck PostsR507.8 Deck Posts Minimum sizes of wood
posts supporting wood decks
Lateral restraint at bottom
2015 IRC Transition from the 2009 IRC 73
2015 Fastener Schedule for Structural MembersFastener Schedule for Structural Members2012 IRC 2015 IRC Table R602.3(1) Table R602.3(1)Table R602.3 (1) now includes requirements for nailing roof trusses to plates, abutting studs at intersecting wall corners, and connection of rim board to sill plates.
The Fastening Schedule now contains multiple nail size options. Roof rafter connections at ridge, valley, and hip are revised. Double top plate splicing is clarified. Clarification of the joist-to-band-joist (rim board) connection is added.
2015 IRC Transition from the 2009 IRC 74
R602.3.1 Stud Size, Height, and SpacingR602.3.1 Stud Size, Height, and Spacing Table R602.3.1 is deleted Exception for walls > 10 feet tall is added to the
text Snow loads < 25 psf Limited application
2015 IRC Transition from the 2009 IRC 75
2015R602.7 HeadersR602.7 Headers2012 IRC 2015 IRCR602.7, Table R602.7.1 R602.7, Tables R602.7(1),
R602.7(2), R602.7(3), R602.7.5
Prescriptive provisions for single member headers added.
Span tables moved from Chapter 5 to Chapter 6
Multi-ply and single header tables combined
New section on rim board headers
New table for porches New table for king studs
2015 IRC Transition from the 2009 IRC 76
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Copyright 2015 International Code Council 20
Table R602.7(3) Girder and Header Spans for Open Porches
Table R602.7(3) Girder and Header Spans for Open Porches
Size
Supporting RoofGround Snow Load (psf)
30 50Depth of Porch (feet)
8 14 8 142-2x8 10-1 7-7 8-3 6-22-2x10 12-4 9-4 10-1 7-72-2x12 14-4 10-10 11-8 8-10
77
Open Porch
2015
2015 IRC Transition from the 2009 IRC
Table R602.7.5 Minimum Number of Full Height Studs at Each End of Headers In Exterior Walls
Table R602.7.5 Minimum Number of Full Height Studs at Each End of Headers In Exterior Walls
78
Header Span (feet)
Maximum Stud Spacing (inches)
[per Table R602.3(5)]
16 24
3 1 14 2 18 3 212 5 316 6 4
2015
2015 IRC Transition from the 2009 IRC
Wall BracingWall Bracing
792015 IRC Transition from the 2009 IRC
R602.10 Wall BracingSummaryR602.10 Wall BracingSummary
2012 IRC 2015 IRC
Reorganization Inset distance BWP spacing Continuous sheathing end
conditions
Updated to Ultimate design wind speed
CS-PF & PFH modified Cripple walls
2015 IRC Transition from the 2009 IRC 80
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Copyright 2015 International Code Council 21
R602.10.2 Braced Wall PanelsR602.10.2 Braced Wall Panels Measurements to edge of BWP BWP ≤10 feet from both ends of BWL BWP at end in SDC D0, D1, D2 Exceptions for other end conditions
≤ 20 feet between BWPs 2 BWPs for BWL >16 feet
2015 IRC Transition from the 2009 IRC 81
2012
82
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2015
3500 lb. strap
Table R602.10.5 Min. Length BWPsTable R602.10.5 Min. Length BWPs
83
Method Minimum length (in) Contributing length (in)
Wall height (ft)8 9 10 11 12
PFH – roof only 16 16 16 18 20 48
PFH - story+roof 24 24 24 27 29 48
PFG SDC A, B, C 24 27 30 33 36 1.5 × Actual
CS-PF 16 18 20 22 24 ActualCS-PF SDC A, B, C 16 18 20 22 24 1.5 × Actual
CS-PF SDC D0, D1, D2 16 18 20 22 24 Actual
2015 IRC Transition from the 2009 IRC
2015R602.10.6.2 Method PFHR602.10.6.2 Method PFHPortal Frame with Hold-Downs Recent testing Minimum hold-down capacity
lowered to 3500 lbs Two sill plates are sufficient (3 in
2012 IRC)
842015 IRC Transition from the 2009 IRC
2015
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R602.10.7 Ends of Braced Wall Lines with Continuous SheathingR602.10.7 Ends of Braced Wall Lines with Continuous Sheathing
Adds end condition 3: Return panel or hold-
down not required at corner with a 48-inch braced wall panel
2015 IRC Transition from the 2009 IRC 85
2012 R602.10.11 Cripple Wall BracingR602.10.11 Cripple Wall Bracing Maximum distance between braced wall panels in a
cripple wall: Reduction is no longer required 2012 IRC = 14 ft. 2015 IRC = 20 ft.
1.15 increase in bracing amount still in effect Increased bracing is required if gypsum wall finish is not
applied Add 1.4 for wind and 1.5 for seismic
2015 IRC Transition from the 2009 IRC 86
2015
Simplified Wall BracingSimplified Wall Bracing2012 IRC 2015 IRCR602.12 R602.12 New section SDC A, B, C and
townhouses in SDC A or B Limitations on wind
speed, exposure category, building size and other criteria.
3-story buildings (previously 2)
Wind Exposure B and C Bracing units for C: 1.2;
1.3; 1.4 Wind speed (Vult) 115 and
130 mph
2015 IRC Transition from the 2009 IRC 87
R703.3 Siding Material Thickness and AttachmentR703.3 Siding Material Thickness and Attachment Replaced Table R703.4, Weather Resistant
Siding Attachment and Minimum Thickness New language clarifies limitations of table and
describes fastener type, length, and penetration. Footnotes to text Columns deleted
2015 IRC Transition from the 2009 IRC 88
2015
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R703.5 Wood, Hardboard, and Wood Structural Panel SidingR703.5 Wood, Hardboard, and Wood Structural Panel Siding
Minimum spacing based on siding thickness Moved from Table R703.4 footnote i to R703.5.2.
Requirements for vertical wood siding Moved from footnote j to R703.5.1
2015 IRC Transition from the 2009 IRC 89
2015 R703.7.3.2 Masonry Veneer LintelR703.7.3.2 Masonry Veneer Lintel Economical alternative for large masonry veneer
openings, limited to 18 feet, 3 inches
2015 IRC Transition from the 2009 IRC 90
2012
R703.7.4 Masonry Veneer AnchorageR703.7.4 Masonry Veneer Anchorage Wall ties Minimum fasteners Spacing to match TMS 402/ACI
530/ASCE 5 Horizontal spacing increased to 32”
Veneer air space requirements Placed in a new table
2015 IRC Transition from the 2009 IRC 91
2012 R703.7.4 Masonry Veneer AnchorageR703.7.4 Masonry Veneer Anchorage
2015 IRC Transition from the 2009 IRC 92
2012
2015 IRC Transition from the 2009 IRC
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R703.9 Exterior Insulation and Finish SystemsR703.9 Exterior Insulation and Finish Systems Limitations for EIFS EIFS without drainage: Concrete and masonry
EIFS with drainage: All other wall assemblies
2015 IRC Transition from the 2009 IRC 93
2015 R703.11.1Vinyl Siding AttachmentR703.11.1Vinyl Siding Attachment Min. 1¼ inches into
“nailable substrate” or Through sheathing per test
report and manufacturer Nail 0.120 shank x 0.313
head 16 in. o.c.
942015 IRC Transition from the 2009 IRC
R703.12 Adhered Masonry Veneer
R703.12 Adhered Masonry Veneer
Minimum clearance and flashing requirements for exterior walls
2015 IRC Transition from the 2009 IRC 95
2012 R703.13, R703.14 Insulated Vinyl Siding and Polypropylene SidingR703.13, R703.14 Insulated Vinyl Siding and Polypropylene Siding
Insulated vinyl siding ≥ R-2 Continuous insulation Improved moisture control
Polypropylene siding requires separation: 5 ft. lot lines 10 ft. building on other lot
Fastening requirements
2015 IRC Transition from the 2009 IRC 96
2015
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Copyright 2015 International Code Council 25
R703.15, R703.16, R703.17 Cladding Attachment over Foam SheathingR703.15, R703.16, R703.17 Cladding Attachment over Foam Sheathing
To wood framing (R703.15),
To cold-formed steel framing (R703.16), and
To masonry or concrete walls (R703.17).
2015 IRC Transition from the 2009 IRC 97
2015 Tables R802.4, R802.5 Ceiling Joist and Rafter Span TablesTables R802.4, R802.5 Ceiling Joist and Rafter Span Tables Span lengths Decreased for
Southern Pine Increased for DFL
and HF
2015 IRC Transition from the 2009 IRC 98
2015
R802.7 Cutting, Drilling, and Notching of Roof MembersR802.7 Cutting, Drilling, and Notching of Roof Members References Section R502.8.1 Notching of cantilevered rafters
(R802.7.1.1) New section Actual minimum
dimension of 3½ inches New figure
R802.7.1.1 Ceiling joist taper cut requirements New figure
R802.7.1.2
2015 IRC Transition from the 2009 IRC 99
2012 802.11 Roof Uplift Resistance802.11 Roof Uplift Resistance New Table R802.11 Accurate prescriptive values Rafters and trusses Both low- and high-slope roofs Wind Exposure Categories B and C
2015 IRC Transition from the 2009 IRC 100
2012
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Table R802.11 Rafter or truss uplift connectionTable R802.11 Rafter or truss uplift connection
101
Rafter or Truss
Spacing
Roof Span (feet)
Exposure BUltimate Wind Speed Vult
(mph)115
Roof Pitch< 5:12 ≥ 5:12
24 in. o.c.28 198 17632 218 19436 240 212
2015 IRC Transition from the 2009 IRC
R806Roof VentilationR806Roof Ventilation Revised by placing two exceptions after the
general rule of 1/150 Exception for 1/300 vapor retarder on ceiling (only in cold-weather
climates) 40 – 50% of ventilation in upper portion ≤3 feet
below the ridge (previously 50-80)
Option to omit attic ventilation when approved (2015) Upper vents ≥3 feet above the eave vents (2012)
2015 IRC Transition from the 2009 IRC 102
2012
Unvented Attic AssembliesUnvented Attic Assemblies2012 IRC 2015 IRCR806.5 Table R806.5 Insulation for
condensation control Applies to rafter
assemblies (vaulted or cathedral ceilings)
Specifies applicable class of vapor retarder
Insulation board as air-impermeable barrier requires sealed edges
New footnote b allowing calculation of insulation thickness when the insulation is placed above the structural roof sheathing.
2015 IRC Transition from the 2009 IRC 103
R903.2.1 Roof Flashing LocationsR903.2.1 Roof Flashing Locations
General flashing provisions for all roofing Kick-out flashing where eave
of roof intersects a wall
2015 IRC Transition from the 2009 IRC 104
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R903.2.2 Crickets and SaddlesR903.2.2 Crickets and Saddles Unit skylights or roof windows per
manufacturer’s installation instructions Cricket requirements
do not apply
2015 IRC Transition from the 2009 IRC 105
2012UnderlaymentUnderlayment2012 IRC 2015 IRCR905.2.7.2 R905.1.1, R905.1.2 Nominal wind ≥120 mph
(Vult ≥140 mph 2015) Metal or plastic cap
nails 12 in OC 6 in OC at side laps 4-in laps
Exception for self-adhering (ASTM D 1970)
Roof underlayment provisions combined into Section R905.1.1
3 tables listing underlayment type, application, and attachment.
Sections on ice barriers combined into Section R905.1.2
2015 IRC Transition from the 2009 IRC 106
R905.2.8.3 Sidewall FlashingR905.2.8.3 Sidewall Flashing Asphalt shingles
intersection at wall step flashing or continuous base flashing
2015 IRC Transition from the 2009 IRC 107
2012 R905.2.8.5 Roof Drip EdgeR905.2.8.5 Roof Drip Edge Roof drip edge required for asphalt shingles 2-inch laps Nails at 12 inches OC
2015 IRC Transition from the 2009 IRC 108
2012
2015 IRC Transition from the 2009 IRC
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R905.16 Photovoltaic ShinglesR905.16 Photovoltaic Shingles Additional requirements
and limits for photovoltaic shingles
R905.16 Photovoltaic shingles.
R905.16.1 Deck requirements.
R905.16.2 Deck slope. R905.16.3 Underlayment. R905.16.4 Underlayment
application. R905.16.4.1 Ice barrier. R905.16.4.2 Underlayment
and high winds.
2015 IRC Transition from the 2009 IRC 109
2015 R907 Rooftop-MountedPhotovoltaic SystemsR907 Rooftop-MountedPhotovoltaic Systems
Requirements and limits for rooftop-mounted photovoltaic systems Wind resistance Fire classification Installation Ref. R324 and NFPA
70
110
Check errata to Section R324
2015 IRC Transition from the 2009 IRC
2015
111
2015 ISEPInternational Solar Energy Provisions & Commentary
2015 IRC Transition from the 2009 IRC
R907.3 Recovering versus Replacement of RoofingR907.3 Recovering versus Replacement of Roofing Does not require the removal of self-adhered ice
barrier underlayment Deletes all hail provisions hail exposure map related definitions limitations on reroofing in hail zones
2015 IRC Transition from the 2009 IRC 112
2012
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113
Chimney cap required (ASTM C 1283) Concrete, metal or stone Sloped to shed water Drip edge Caulked bond
break around flue liner
R1003.9.1 – Chimney capsR1003.9.1 – Chimney caps
Masonry chimney cap
2012
2015 IRC Transition from the 2009 IRC 114
Rain caps optional
Minimum criteria for installation
R1003.9.3 – Rain capsR1003.9.3 – Rain caps
Rain cap
2012
2015 IRC Transition from the 2009 IRC
R1005.7 Factory-built Chimney OffsetsR1005.7 Factory-built Chimney Offsets Factory-built chimney
assemblies installed vertically offsets ≤ 30 degrees maximum 4 elbows
115
Page 161
2015 IRC Transition from the 2009 IRC
2012
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Energy Conservation (Chapter 11)Energy Conservation (Chapter 11)
Part 4
116
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Chapter 11Energy EfficiencyChapter 11Energy Efficiency Chapter 11 provisions extracted
from the applicable residential requirements of the IECC
2015 IRC Transition from the 2009 IRC 117
2012 N1101.13Compliance PathsN1101.13Compliance Paths
1. Sections N1101.14 through N1104.
2. Section N1105 and the provisions of Sections N1101.14 through N1104 labeled “Mandatory.”
3. An energy rating index (ERI) approach in Section N1106.
118
Projects shall comply with one of the following:
Prescriptive and mandatory provisionsPrescriptive and mandatory provisions
Performance and mandatory provisionsPerformance and mandatory provisions
2015 IRC Transition from the 2009 IRC
2015
Permanent Energy CertificatePermanent Energy Certificate
2012 IRC 2015 IRCN1101.14 (N1101.16) N1101.14 Indicate results of: blower door testing duct testing
Inside building: On wall in furnace
space or utility room, or Another approved
location
2015 IRC Transition from the 2009 IRC 119 120
Increased energy savings: Increased R-values Decreased U-factors Increased SHGC
N1102 – Building thermal envelopeN1102 – Building thermal envelope
Wood Wall R-ValueZone 2006 20126 19 20 + 57 & 8 21 20 + 5
2012
2015 IRC Transition from the 2009 IRC
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N1102.1.3 R-Valve Computation- Insulated SidingN1102.1.3 R-Valve Computation- Insulated Siding Insulated siding as
continuous insulation in satisfying wall R-value.
Min R-2 Labeled R-value reduced
by R-0.6 for calculation purposes
2015 IRC Transition from the 2009 IRC 121
2015 N1102.2.4 Access Hatches and DoorsN1102.2.4 Access Hatches and Doors Vertical doors that
access unconditioned attics and crawl spaces: Do not require an R-
value to match the required wall insulation.
Must comply with the fenestration U-factor requirements of Table N1102.1.2.
2015 IRC Transition from the 2009 IRC 122
2015
N1102.2.7, Table N1102.1.2 R-Value Reduction for Walls with Partial Structural Sheathing
N1102.2.7, Table N1102.1.2 R-Value Reduction for Walls with Partial Structural Sheathing Moved from
footnote h of Table N1102.1.2 and placed in a new section
≤ 40% gross wall area
1232015 IRC Transition from the 2009 IRC
2015 N1102.2.8, Table N1102.4.1.1 Floor Framing Cavity InsulationN1102.2.8, Table N1102.4.1.1 Floor Framing Cavity Insulation Permits air space
above floor framing cavity insulation
Table N1102.4.1.1 reformatted into three columns to separate air barrier from insulation requirements.
2015 IRC Transition from the 2009 IRC 124
2015
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Table N1102.4.1.1 Insulation at Wall Corners and HeadersTable N1102.4.1.1 Insulation at Wall Corners and Headers Cavity insulation min. R-3 per inch of insulation
1252015 IRC Transition from the 2009 IRC
2015 N1102.4.1.2 Building Thermal Envelope TestingN1102.4.1.2 Building Thermal Envelope Testing Blower door test required Air-leakage rate: Zones 1-2: ≤ 5 ACH Zones 3-8: ≤ 3 ACH
Test results on permanent certificate
2015 IRC Transition from the 2009 IRC 126
2012
N1102.4.2, Table N1102.4.1.1 Wood-burning Fireplace Doors N1102.4.2, Table N1102.4.1.1 Wood-burning Fireplace Doors Doors on wood-burning
fireplaces must be listed for the application.
The requirement for gasketed doors on fireplaces has been removed.
2015 IRC Transition from the 2009 IRC 127
2015 N1103.3 Duct Sealing and TestingN1103.3 Duct Sealing and Testing The duct sealing and testing provisions have been
reorganized to clarify the application. The maximum duct leakage rates are now
prescriptive rather than mandatory provisions to accommodate design flexibility.
2015 IRC Transition from the 2009 IRC 128
2015
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129
Building cavities (Mandatory) Cannot be used as ducts or plenums
Significant Changes to the International Residential Code 2012
N1103.3.5 (N1103.2.3)Building CavitiesN1103.3.5 (N1103.2.3)Building Cavities
2012 N1103.5 Heated Water Circulation and Temperature Maintenance SystemsN1103.5 Heated Water Circulation and Temperature Maintenance Systems
Automatic controls Continuously operating circulation pumps are
no longer permitted. Heat trace systems must comply with one of
the referenced standards.
2015 IRC Transition from the 2009 IRC 130
2015
N1103.5.3 (N1103.4.2) Hot Water Pipe InsulationN1103.5.3 (N1103.4.2) Hot Water Pipe Insulation Minimum R-3 insulation for hot water piping ≥ 3/4 in diameter Serving more than one dwelling unit Outside conditioned space Water heater to distribution manifold Under a floor slab or buried Supply and return piping in recirculation systems
other than demand recirculation systems
2015 IRC Transition from the 2009 IRC 131
2012
Includes minor changes in 2015 also
N1104.1 Lighting EquipmentN1104.1 Lighting Equipment
High-efficacy lamps required: 75% of lamps in
permanent luminaires or All lamps in 75% of
permanent luminaires
2015 IRC Transition from the 2009 IRC 132
2012
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Mechanical (Chapter 12 through 32) Mechanical (Chapter 12 through 32)
Part 5
1332015 IRC Transition from the 2009 IRC
M1301 Identification and Certification of Pipe, Tubing, and FittingsM1301 Identification and Certification of Pipe, Tubing, and Fittings All pipe, tubing, and fittings require manufacturer’s mark third-party testing or certification
New definitions supplement the provisions.
2015 IRC Transition from the 2009 IRC 134
2012
M1411.6 Locking Access Port CapsM1411.6 Locking Access Port Caps The code now
recognizes any approved means to prevent unauthorized access to outdoor refrigerant ports.
2015 IRC Transition from the 2009 IRC 135
2012 M1502.4 Dryer Exhaust DuctM1502.4 Dryer Exhaust Duct Support spacing increased from 4 to12 feet Mechanical fastening requiredScrew fasteners penetrate ≤ 1/8 inch
Specified length increased from 25 to 35 feet
2015 IRC Transition from the 2009 IRC 136
2012
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M1502.4.4, M1502.4.5 Dryer Exhaust Duct Power Ventilators M1502.4.4, M1502.4.5 Dryer Exhaust Duct Power Ventilators Dryer exhaust duct power
ventilators (DEDPVs) to increase the allowable exhaust duct length for clothes dryers.
Listed and labeled UL 705
Max. length per manufacturer
2015 IRC Transition from the 2009 IRC 137
2015 M1502.4.6Dryer Duct Length IdentificationM1502.4.6Dryer Duct Length Identification Permanent label
required where equivalent duct length >35 feet
Label not required where equivalent duct length ≤35 feet
Not based on whether the duct is concealed or not
2015 IRC Transition from the 2009 IRC 138
2015
M1503.4Makeup Air for Range HoodsM1503.4Makeup Air for Range Hoods Makeup air for kitchen
exhaust systems >400 cfm: Automatic damper, or Gravity damper Transfer openings are
permitted to obtain makeup air from rooms other than the kitchen
139
2015
2015 IRC Transition from the 2009 IRC
M1506Exhaust OpeningsM1506Exhaust Openings Termination ≥ 3 feet from property
line ≥ 3 feet from openings ≥ 10 feet from or 3 feet
above mechanical air intakes
2015 IRC Transition from the 2009 IRC 140
2012
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M1506.2 Exhaust Duct LengthM1506.2 Exhaust Duct Length Maximum exhaust duct lengths based on: Duct diameter Type of duct Exhaust fan airflow rating
2015 IRC Transition from the 2009 IRC 141
2015 M1507Mechanical VentilationM1507Mechanical Ventilation Whole-house mechanical ventilation Prescriptive air flow rate based on Area of dwelling Number of bedrooms Continuous or intermittent operation
Local exhaust Mechanical ventilation of kitchens and bathrooms
2015 IRC Transition from the 2009 IRC 142
2012
M1507.3 Whole-house mechanical ventilation systemM1507.3 Whole-house mechanical ventilation system System design: One or more supply or
exhaust fans, or a combination
Supply ventilation can be outdoor air ducts connected to the return side of air handler
System controls To enable manual override
1432015 IRC Transition from the 2009 IRC
M1601.1 Above-Ground Duct Systems
M1601.1 Above-Ground Duct Systems Stud cavities of
exterior walls are no longer permitted to be used for return air plenums.
2015 IRC Transition from the 2009 IRC 144
2012
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M1601.4 Duct InstallationM1601.4 Duct Installation Tapes and mastics used to seal sheet metal
ducts must be listed to UL 181 B as has been required for sealing flexible ducts.
Snap-lock and button-lock seams are no longer exempt from the sealing requirements.
2015 IRC Transition from the 2009 IRC 145
2015 M1601.4.1 Duct Joints, Seams and ConnectionsM1601.4.1 Duct Joints, Seams and Connections IMC & SMACNA HVAC Duct Construction
Standards Joints, seams and connections: Securely fastened Sealed Unlisted duct tape not
permitted for sealing
2015 IRC Transition from the 2009 IRC 146
2012
M1602Return AirM1602Return Air Return air provisions
reorganized & clarified Provisions for outdoor air
openings removed in favor of references to the applicable provisions for outdoor air in Chapter 3
Preserves intent to keep contaminants out of return air circulated throughout the dwelling
2015 IRC Transition from the 2009 IRC 147
2015 M1602.2 Prohibited Sourcesof Outdoor and Return AirM1602.2 Prohibited Sourcesof Outdoor and Return Air Permits return air from garage for system that
serves garage only 10-foot rule applies to atmospheric burner
appliances only
2015 IRC Transition from the 2009 IRC 148
2012
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M1901Ranges and OvensM1901Ranges and Ovens
Cooking appliances listed and labeled for household use
Commercial appliances prohibited
Vertical clearances clarified
2015 IRC Transition from the 2009 IRC 149
2012
Fuel Gas (Chapter 24)Fuel Gas (Chapter 24)
Part 6
1502015 IRC Transition from the 2009 IRC
G2404.11 Condensate PumpsG2404.11 Condensate Pumps Condensate pumps located in uninhabitable
spaces must be connected to the appliance to shut down the equipment in the event of pump failure.
2015 IRC Transition from the 2009 IRC 151
2015 G2409.1 Reduced Clearance to Combustible MaterialsG2409.1 Reduced Clearance to Combustible Materials Gypsum board is now specifically identified as a
combustible material for purposes of determining required clearances around gas-fired appliances.
2015 IRC Transition from the 2009 IRC 152
2012
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G2411.1.1 Electrical Bonding of Corrugated Stainless Steel TubingG2411.1.1 Electrical Bonding of Corrugated Stainless Steel Tubing
75-foot maximum allowable length of bonding jumper
Bonding methods must comply with NFPA 70
Devices, such as clamps, must be listed in accordance with UL 467
1532015 IRC Transition from the 2009 IRC
G2412, G2415 Pipe Identification and CertificationG2412, G2415 Pipe Identification and Certification All pipe, tubing, and fittings used in a fuel-gas
system now require Manufacture’s mark and Third-party testing or certification
New definitions supplement the provisions.
2015 IRC Transition from the 2009 IRC 154
2012
G2413.2 Maximum Gas DemandG2413.2 Maximum Gas Demand Table G2413.2 Approximate Input and the
reference to it were deleted The code requires the actual maximum input
rating of the appliances to be known and used for gas pipe sizing purposes.
2015 IRC Transition from the 2009 IRC 155
2015 G2414.6Plastic Pipe, Tubing and FittingG2414.6Plastic Pipe, Tubing and Fitting PVC and CPVC pipe are expressly prohibited
materials for supplying fuel gas.
2015 IRC Transition from the 2009 IRC 156
2015
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G2415.5Fittings in Concealed LocationsG2415.5Fittings in Concealed LocationsChange Type: Clarification Approved fittings:
1. Threaded elbows, tees and couplings
2. Brazed fittings3. Welded fittings4. Fittings listed to ANSI
LC-1/CSA 6.26 or ANSI LC-4.
2015 IRC Significant Changes 157
2015 G2415.7 Protection of Concealed Piping Against Physical DamageG2415.7 Protection of Concealed Piping Against Physical Damage Completely rewritten to address concealed
piping: Parallel to framing members Within framing members
Protection must extend well beyond edge of members that are bored or notched
2015 IRC Transition from the 2009 IRC 158
2015
G2419.4 Sediment TrapG2419.4 Sediment Trap A new figure for correct
configuration Not required for: Gas-fired decorative
vented appliances installed in vented fireplaces Gas fireplaces
2015 IRC Transition from the 2009 IRC 159
2012 G2421.2 Medium-Pressure RegulatorsG2421.2 Medium-Pressure Regulators Medium-Pressure (MP) line regulators installed
in rigid piping must have a union installed to allow removal of the regulator.
2015 IRC Transition from the 2009 IRC 160
2015
2015 IRC Transition from the 2009 IRC
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G2422.1 Connecting Portable and Movable AppliancesG2422.1 Connecting Portable and Movable Appliances Connectors for portable gas appliances used
outdoors Gas hoses must comply with ANSI Z21.54.
Examples: gas grills fire pits patio heaters
2015 IRC Transition from the 2009 IRC 161
2015 G2426.7.1 Door Clearance to Vent TerminalsG2426.7.1 Door Clearance to Vent Terminals An appliance vent
terminal is not permitted in a location with 12 inches of the arc of a swinging door.
2015 IRC Transition from the 2009 IRC 162
2015
G2427.4.1, G2427.6.8.3 Plastic Piping for Appliance VentsG2427.4.1, G2427.6.8.3 Plastic Piping for Appliance Vents
Approval of plastic pipe for venting appliances is the responsibility of the appliance manufacturer and the appliance listing agency.
2015 IRC Transition from the 2009 IRC 163
2015 G2427.8 Venting System Termination LocationG2427.8 Venting System Termination Location A 10-foot separation is required when a vent
discharges in the direction of an opening in an adjacent building.
2015 IRC Transition from the 2009 IRC 164
2015
2015 IRC Transition from the 2009 IRC
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G2439.4, G2439.7 Clothes Dryer Exhaust DuctsG2439.4, G2439.7 Clothes Dryer Exhaust Ducts Permits dryer exhaust duct power ventilators (DEDPVs)
to increase the allowable exhaust duct length for clothes dryers
Permanent label: Required where equivalent duct length >35 feet Not required ≤35 feet whether the duct is concealed or not
Instead of prohibiting all duct fasteners such as screws and rivets, the code now limits the penetration of fasteners, where installed.
2015 IRC Transition from the 2009 IRC 165
2015 G2442.4 Prohibited Sources of Outdoor and Return AirG2442.4 Prohibited Sources of Outdoor and Return Air Permits return air from garage for system that
serves garage only 10-foot rule applies to atmospheric burner
appliances only
2015 IRC Transition from the 2009 IRC 166
2012
G2447.2 Prohibited Location of Commercial Cooking AppliancesG2447.2 Prohibited Location of Commercial Cooking Appliances
The code does not prohibit the installation of cooking appliances that are listed as both commercial and domestic appliances.
2015 IRC Transition from the 2009 IRC 167
2015
Plumbing (Chapter 25 through 33)Plumbing (Chapter 25 through 33)
Part 7
1682015 IRC Transition from the 2009 IRC
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P2502.1, P2503.4 Inspection and Tests for Building SewerP2502.1, P2503.4 Inspection and Tests for Building Sewer When the entire sanitary drainage system is
replaced: Internal examination of underground and under slab
piping is required to verify: Size Slope Condition
A new provision prescribes a pressure test for a forced sewer at a test pressure of 5 psi greater than the pump rating.
2015 IRC Transition from the 2009 IRC 169
2015 P2503.5 Drain, Waste, and Vent Systems TestingP2503.5 Drain, Waste, and Vent Systems Testing The head pressure for a water test on drain,
waste, and vent (DWV) systems has been reduced from 10ft to 5ft.
2015 IRC Transition from the 2009 IRC 170
2015
P2503.5.1 Rough Plumbing TestP2503.5.1 Rough Plumbing Test
The IRC no longer permits air testing of plastic piping in DWV systems.
2015 IRC Transition from the 2009 IRC 171
2012 P2603.2.1 Protection Against Physical DamageP2603.2.1 Protection Against Physical Damage Edge distance
reduced from <1½ in. to <1¼ in.
Accommodates ½-in. dia. copper pipe in 2x4 framing
2015 IRC Transition from the 2009 IRC 172
2015
2015 IRC Transition from the 2009 IRC
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P2603.3 Protection Against CorrosionP2603.3 Protection Against Corrosion The minimum thickness of sheathing material for
protection of piping against corrosion has been reduced from 0.025 inches to 0.008 inches (8 mil).
The corrosion protection requirement applies to metallic piping other than cast iron, ductile iron, and galvanized steel that is in direct contact with concrete, masonry or steel framing.
Previously, protection was only required for materials passing through walls and floors of these materials.
All metallic piping requires corrosion protection when located in corrosive soils.
2015 IRC Transition from the 2009 IRC 173
2015 P2603.4 Pipes through Foundation WallsP2603.4 Pipes through Foundation Walls A sleeve or relieving arch is not required for
pipes passing under a footing.
2015 IRC Transition from the 2009 IRC 174
2012
Table P2605.1 Piping SupportTable P2605.1 Piping Support Support spacing requirements for PEX and PE-RT
tubing 1¼ inches and greater in diameter have been added to the table.
Footnote b of Table P2605.1 clarifies the mid-story guide requirements for some types of vertical pipe 2 inches and smaller in diameter.
2015 IRC Transition from the 2009 IRC 175
2015 P2606 Sealing of Annular SpacesP2606 Sealing of Annular Spaces Sealing pipe
penetrations of the building envelope: Caulking material Foam sealant Gasketing system Serves to seal against air
leakage per IECC
2015 IRC Transition from the 2009 IRC 176
2012
2015 IRC Transition from the 2009 IRC
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P2609.1, 2609.4 Identification and CertificationP2609.1, 2609.4 Identification and Certification Pipe, fittings, and plumbing components identification of the manufacturer marking requirements of the applicable referenced
standard listed by a third-party certification agency Table P2608.4 and third-party testing requirements
have been deleted
2015 IRC Transition from the 2009 IRC 177
2012 Plumbing Fixtures, Waste ReceptorsPlumbing Fixtures, Waste Receptors2012 IRC 2015 IRCP2702.1, P2706.1 P2702.1, P2706.1
Plumbing fixtures: Include floor drains and
standpipes Strainers not required on
hub drains and standpipes Attics and crawlspaces
prohibited locations for waste receptors and standpipes
Clothes-washer standpipes permitted in bathrooms
A definition of waste receptor has been added to the code. Waste receptors are now permitted in bathrooms and closets.
WASTE RECEPTOR. A floor sink, standpipe, hub drain or a floor drain that receives the discharge of one or more indirect waste pipes.
2015 IRC Transition from the 2009 IRC 178
P2709.1, P2709.2 Shower Receptors and LiningP2709.1, P2709.2 Shower Receptors and Lining
Shower liner extension above finished threshold reduced from 3 to 2 inches
No minimum thickness for PVC and CPE liners
2015 IRC Transition from the 2009 IRC 179
2012 P2717 Dishwashing MachinesP2717 Dishwashing Machines The code now references the applicable standards for
integral air gaps protecting the potable water supply to dishwashers.
The term “food waste disposer” replaces “food waste grinder.”
Sections P2717.2 and P2717.3 regarding dishwasher discharge to the sink tailpiece or the food waste disposer have been combined into a single Section P2717.2, eliminating redundant language.
2015 IRC Transition from the 2009 IRC 180
2015
2015 IRC Transition from the 2009 IRC
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Water Heater Drain Valves and PansWater Heater Drain Valves and Pans2012 IRC 2015 IRCP2801.5 P2801
Safety pan provisions: Apply to storage-
tank type water heaters and hot water storage tanks
Do not apply to tankless water heaters
Requires drain valves with a threaded outlet
Aluminum and plastic pans of the prescribed thickness acceptable.
Pan drain is not required when a water heater is replaced and there is no existing drain.
2015 IRC Transition from the 2009 IRC 181
P2804.6.1 Water Heater Relief Valve Discharge PipingP2804.6.1 Water Heater Relief Valve Discharge Piping The T&P relief valve
discharge pipe termination requires an air gap
PEX and PE-RT tubing used for relief valve discharge piping: Must be one size larger than
the T&P valve discharge outlet
Outlet end of the tubing must be fastened in place
2015 IRC Transition from the 2009 IRC 182
2015
P2901, P2910 through P2913 Nonpotable Water SystemsP2901, P2910 through P2913 Nonpotable Water Systems Nonpotable water outlets
identified The color purple identifies
distribution piping conveying nonpotable water.
New Sections P2910 through P2913 are extracted from the IgCC: Collection Storage Distribution
1832015 IRC Transition from the 2009 IRC
P2904.2.4.2 Minimum Fire Sprinkler Separation from ObstructionsP2904.2.4.2 Minimum Fire Sprinkler Separation from Obstructions
A new figure provides prescriptive values for minimum separation distances between fire sprinklers and obstructions.
Lesser distances are permitted in accordance with the manufacturer’s installation instructions.
2015 IRC Transition from the 2009 IRC 184
2012
2015 IRC Transition from the 2009 IRC
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P2905 Heated Water Distribution SystemsP2905 Heated Water Distribution Systems Pointers have been added to the IRC plumbing
provisions to direct the user to the applicable energy conservation provisions of IRC Chapter 11 related to heated water distribution systems.
Section N1103.5 requires automatic controls to maintain hot water temperature for heated water circulation systems and for heat trace temperature maintenance systems when such systems are installed.
2015 IRC Transition from the 2009 IRC 185
2015 P2906.2 Lead Content of Drinking Water Pipe and FittingsP2906.2 Lead Content of Drinking Water Pipe and Fittings Water for drinking or
cooking Piping, fittings, joints: ≤0.25% lead content Federal law NSF 372
Other water supply piping: ≤8% lead content NSF 61
2015 IRC Significant Changes 186
P3003.9 Solvent Cementing of PVC JointsP3003.9 Solvent Cementing of PVC Joints Primer is not required for: DWV PVC pipe and fittings ≤4-inch pipe size Non-pressure application
2015 IRC Transition from the 2009 IRC 187
2015 P3003.19 Joints between Drainage Piping and Water ClosetsP3003.19 Joints between Drainage Piping and Water Closets Use of waste connector and sealing gasket is
now permitted as an alternative to a flanged connection for floor-mounted water closets.
2015 IRC Transition from the 2009 IRC 188
2012
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P3005.2 CleanoutsP3005.2 Cleanouts Section completely
reorganized Brass cleanout plugs are only
permitted for metallic piping Cleanout must be within 1½
inches of the finished wall surface
Cleanout is no longer required at the base of each waste or soil stack
2015 IRC Transition from the 2009 IRC 189
2015 P3007.3.5 Ejector Connectionto the Drainage SystemP3007.3.5 Ejector Connectionto the Drainage System
Discharge from ejector pumps permitted to connect to:
soil stacks waste stacks horizontal branch drains building sewers building drains
2015 IRC Transition from the 2009 IRC 190
2012
P3008.1 Backwater ValvesP3008.1 Backwater Valves For existing buildings, fixtures that are located
above the next upstream manhole cover are allowed to discharge through a backwater valve.
2015 IRC Transition from the 2009 IRC 191
2015 P3103.1, P3103.2 Vent TerminalsP3103.1, P3103.2 Vent Terminals Where a minimum 3-inch diameter vent terminal is
required to prevent frost blockage in cold climates, the 3-inch diameter pipe must extend at least 12 inches inside the building’s thermal envelope.
The minimum 7-foot height requirement for vent terminations applies only to roofs used for purposes similar to residential decks, patios and balconies.
2015 IRC Transition from the 2009 IRC 192
2015
2015 IRC Transition from the 2009 IRC
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P3103.1, P3103.2 Vent TerminalsP3103.1, P3103.2 Vent Terminals
2015 IRC Transition from the 2009 IRC 193
2015 P3103.5 Location of Vent TerminalP3103.5 Location of Vent Terminal The minimum
clearance to vent terminations above openings within 10 feet has been increased from 2 feet to 3 feet.
2015 IRC Transition from the 2009 IRC 194
2012
Location of vent terminal
P3201.2 Trap Seal Protection Against EvaporationP3201.2 Trap Seal Protection Against Evaporation Trap seal protection against evaporation can
now be accomplished in a variety of ways, including trap seal primer valves supplied with nonpotable water and barrier-type trap seal protection devices
2015 IRC Transition from the 2009 IRC 195
2015
Electrical (Chapter 34 through 43)Electrical (Chapter 34 through 43)
Part 8
1962015 IRC Transition from the 2009 IRC
2015 IRC Transition from the 2009 IRC
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E3608.1.2 Concrete-Encased ElectrodesE3608.1.2 Concrete-Encased Electrodes Separate parts to clarify
meaning. ≥ 20-foot length
≥ ½-inch electrically conductive reinforcing bars or
≥ 4 AWG bare copper conductor
≥ 2-inch encasement Concrete in direct contact
with earth
2015 IRC Transition from the 2009 IRC 197
2012 E3608.4 Supplemental Electrode RequiredE3608.4 Supplemental Electrode Required A rod, pipe, or
plate electrode requires a supplemental electrode unless testing confirms that the single electrode has a resistance to earth of 25 ohms or less.
2015 IRC Transition from the 2009 IRC 198
2012
E3901.7 Outdoor OutletsE3901.7 Outdoor Outlets An outdoor outlet is
required for any size of deck, porch, or balcony that is accessible from inside the swelling unit.
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2012 E3901.9 Receptacle Outlets for GaragesE3901.9 Receptacle Outlets for Garages Garage receptacle
outlets must be served by a separate branch circuit that does not supply other outlets.
At least one receptacle outlet is required for each car space in a garage.
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E3901.11 Receptacle Outlets in FoyersE3901.11 Receptacle Outlets in Foyers Foyers > 60 square feet in area Receptacle in each wall space ≥ 3 feet
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2012 E3902.8, E3902.9, E3902.10 Ground-Fault Circuit Interrupter Protection
E3902.8, E3902.9, E3902.10 Ground-Fault Circuit Interrupter Protection
Laundry areas have been added to the list of locations requiring ground-fault circuit interrupter (GFCI) protection. Receptacles within 6 feet of bathtubs and showers, and receptacles for dishwashers also require CFGI protection.
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E3902.8, E3902.9, E3902.10 Ground-Fault Circuit Interrupter Protection
E3902.8, E3902.9, E3902.10 Ground-Fault Circuit Interrupter Protection Laundry areas Receptacles within 6 feet
of bathtubs and showers Receptacles for
dishwashers
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E3902.14 Location of Ground-Fault Circuit Interrupters E3902.14 Location of Ground-Fault Circuit Interrupters When provided, ground-fault circuit interrupter
devices must be placed in a readily accessible location.
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E3905.8 Boxes at Fan OutletsE3905.8 Boxes at Fan Outlets When a ceiling outlet box is wired for a future
ceiling fan, the box must be listed for the support of a ceiling fan.
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2012 E4001.15 Switching Controlling Lighting LoadsE4001.15 Switching Controlling Lighting Loads Unless a means of
access for rewiring is provided, a grounded circuit conductor must be provided at the switch outlet.
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E4002.14 Tamper-Resistant ReceptaclesE4002.14 Tamper-Resistant Receptacles Tamper-resistant
receptacles are not required for receptacles: ≥ 5½ feet above
the floor part of a luminaire
or appliance in a dedicated
space for an appliance
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2012 E4203.4.3 Location of Low-Voltage Luminaires Adjacent to Swimming PoolsE4203.4.3 Location of Low-Voltage Luminaires Adjacent to Swimming Pools Listed low-voltage luminaires meeting the
prescribed conditions are permitted to be located less than 5 feet from the water’s edge of swimming pools, spas, and hot tubs
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E4204.2 Bonded Parts of Pools, Spas, and Hut TubsE4204.2 Bonded Parts of Pools, Spas, and Hut Tubs2012 IRC 2015 IRCE4204.2 E4204.2
Metal parts ≤ 5 feet from pool, including Awnings Fences Metal door and window
frames Walls ≥ 5 feet high and < 3
feet from pool: Equipotential bonding
required on pool side of wall only
Perimeter equipotential bonding is not required: Listed as a self-contained spa
for aboveground use Not identified as suitable only
for indoor use Installation per manufacturer
and located on or above grade Top rim of the spa or hot tub is ≥28 in. above all perimeter surfaces within 30 in.
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E4209.3 Accessibility to Electrical Equipment of Hydromassage BathtubsE4209.3 Accessibility to Electrical Equipment of Hydromassage Bathtubs When located behind
access panels and serving hydromassage bathtubs, receptacle outlets must have their face in direct view and within 1 foot of the access opening.
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Appendices Appendices
Part 9
2112015 IRC Transition from the 2009 IRC
Appendix RLight Straw-Clay Construction Appendix RLight Straw-Clay Construction Prescriptive provisions Light straw-clay walls are
non-bearing infill around a structural frame.
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Appendix S Strawbale ConstructionAppendix S Strawbale Construction Prescriptive provisions for strawbale construction Strawbale walls may be bearing walls or nonbearing
infill around a structural frame depending upon the method of construction and detailing.
Appendix S contains requirements for both construction methods.
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What will you do differently with the changes in the code?
How will the changes affect the inspection and plan review process?
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Final ReflectionFinal Reflection
This slide will help the learner to reflect on the day and what they will take back to the job and apply. What? What happened and what was observed
in the training? So what? What did you learn? What difference
did this training make? Now what? How will you do things differently
back on the job as a result of this training?
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International Code Council is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion for non-AIA members are available on request.
This program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.
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