International Residential

1
International Residential Code for One- and
Two- Family Dwellings 2006
2
Scope of the IRC

• Detached One Two Family Dwellings and
  Townhouses
• Separate Means of Egress
• Not more than 3 stories above grade
• Includes accessory structures
• Everything outside this scope is IBC
• IRC is a scaled down IBC listing only
  requirements for items with its scope

3
IBC or IRC?
4
IRC 2006 Chapter 3 Building Planning
5
Purpose of Chapter 3

• The provisions of this chapter address a wide
  variety of issues important to designing a
  building that is both safe and usable. The
  limitations placed on the materials and methods
  of construction can lead to structural integrity.
  Snow, wind, and seismic loading are regulated, as
  are the expected live and dead loads

6
Design Criteria and limitations(R301)

• Dead Load
• Live Load
• Environmental Load
• Deflection of structural members

7
Live Load (Table R301.5 )

Exterior Balconies 60 psf Decks

40 psf Passenger Vehicle Garages 50
psf Attics without storage 10
psf Attics with storage
20 psf Rooms (other than bedrooms) 40
psf Sleeping Rooms
30 psf Stairs
40 psf Guardrails and
Handrails 200 psf
8
Wind Load

• Somerset, Wicomico, Worcester -120 mph
• Caroline, Dorchester, Talbot 100 mph
• All other counties 90mph
• Equivalent basic wind speeds have been adjusted
  to properly reflect the conversion between 3-sec
  gust and fasted mile measurement.
• Basic wind speed exceed 100 mph in
  hurricane-prone regions or 110 mph elsewhere
  shall be designed per WFCM, SSTD10, ASCE-7 etc.

9
Wind Speed Conversions(Table R301.2.1.3)
10
Snow Load
11
Exterior Wall LocationR302
12
Exterior Wall Location
Wall and openings perpendicular to lot lines
require no fire rating
Mini. 1 hr FR and openings are prohibited
lt3 feet
Mini. 1 hr FR with unprotected openings of max.
25 of wall area
gt3 feet and lt5 feet
Wall and openings require no fire rating.
Openings are not limited in area
gt5 feet
13
Proj are limited
1-hr rated wall
Openings _at_ 90 º are ok
1-hr rim board
vents are ok
lt 5 clearance to lot line requires a 1-hr fire
rating
14
Light, Ventilation, and Heating(R303)

• Glazing area vs. floor area of each habitable
  room ( 8, 4 openable).
• Bathroom ( 3 SF glazing 50 openable or 50 CFM
  intermittent ventilation or 20 CFM continuous
  ventilation, must vent directly to outside)
• Stairway illumination (1 foot-candle)
• Required Heating ( 68 F at 3 above floor and 2
  from ext. wall at the design temperature)

15
Minimum Room Area (R304)

• Minimum Floor Area
• Every house must have at least one Habitable
  space at least 120 sf
• All other Habitable Spaces must be at least 70
  sf
• Except - Kitchen
• Every Habitable Space must be at least 7 wide
  in one direction

16
Minimum Ceiling Heights (R305)
Habitable room shall be min. 7 feet AFF.
OR In habitable basement, Beams and girders
spaced 4 O.C. may be within 6-6 AFF
Unhabitable basement ceiling may be 6-8 AFF.
Beams, ducts may project min. 6-4 AFF.
6-6
17
Ceiling Height Floor Area
18
Sanitation (R306)

• Bathrooms
• Every House shall have
• Water Closet
• Lavatory
• Bathtub or Shower
• Minimum fixture spacing per IRC

19
Bathroom Fixtures (R307.1)
20
Minimum Fixture Clearances

15
21 MIN
4
21
Glazing (R308)

• Required in all Hazardous Door and Wall Locations
  11 Locations and 10 Exceptions
• Exception Glazing perpendicular to plane of door
  except for a wall which the door swings towards
• Must have a permanent label specifying
• Glazing Type
• Applicable Testing Standard

22

24
60
60
24
24 Rule Requires Tempered Glazing only on right
side
23
CLOSET IS lt 36 DEEP

Tempered Glazing is NOT required in this window
24
CLOSET IS gt 36 DEEP
Tempered Glass is required in this window
25
Intervening Wall
REQUIRED
NOT REQUIRED
26

60
Safety Glazing Required
27
36
60
BUT NOT HERE
Window adjacent to the stairway requires safety
glazing.
28
60
36
Tempered Glass is required in this window
29
60
Tempered glazing required in windows surrounding
a tub
30
Pools, Saunas and Hot Tubs
TEMPERED GLASS AROUND WALKWAY
29
31
60

60
Tempered glazing required in the windows, doors
and porch wall
32
Garages (R309)

• Opening Protection
• Separation between garage and habitable space
• Garage located less than 3 feet from the dwelling
  unit on the same lot.

33
Fire Separation Requirements

• Direct entry from a garage to a bedroom is not
  permitted.
• ½ Gypsum between garage and all habitable spaces
  
• Floor/ceiling assembly provide 5/8 Type X, all
  supporting structural members protected with ½
  Gypsum
• Less than 3 from a dwelling unit on the same lot
  protected with ½ gypsum applied to interior side
  garage wall

34
2ND FLOOR JOISTS
BUT NOT HERE
Wood beam, column studs and wall carrying joists
must be protected for 20 minutes.
35
Garage door header, jack studs, LVL beam and wall
carrying the floor/ceiling joists must be
protected for 20 minutes
36
Min. 1-3/8 solid wood doors, Min.1-3/8 solid or
honeycomb core steel doors, 20 min fire-rated
doors.
37
Detached garage/dwelling separation
Windows and other openings except complying doors
not permitted
lt3 feet
Mini. ½ G.B.
Doors permitted if Min 1-3/8 solid wood or Min.
1-3/8 steel or 20 F.R.
Not applicable to walls or openings perpendicular
to dwelling unit walls
38
Emergency Escape/ Rescue Openings (R 310)

• Basement (habitable or non-habitable) and every
  sleeping room
• Minimum opening area (5.7 SF)
• Minimum opening height (24)
• Minimum opening width (20)
• Window wells
• Emergency escape windows under decks

39
Emergency Escape/ Rescue Openings (R 310)

• Delete Section R310.1 and replace
• R310.1. Emergency escape required.
• Every sleeping room shall have at least one.
• The sill height not more than 44 above interior
  standing surface
• Bulkhead enclosure shall comply with R310.3
• The net clear opening shall be obtained by the
  normal operation of the window or door from
  inside
• Escape door or window with sill below adjacent
  ground shall be provided with window well per
  R310.2

40
THIS WINDOW MUST BE A MINIMUM OF 5.7 SQFT
- (UNLESS IT IS WITHIN 44 OF EXTERIOR GRADE IN
WHICH CASE IT MUST BE AT LEAST 5 SQFT)
MINIMUM 20 WIDE AND MINIMUM 24 TALL
LESS THAN 44 TO THE FLOOR
Windows must be at least 20 wide and 24 tall
41
Window Wells (R310.2)Ladder and steps (R310.2.1)
If over 44 deep
36
36
42
Means of Egress (R311)

• At least one Exit Door required
• At least 3-0 x 6-8
• Side Hinged
• Operable from inside without a key
• Discharge directly from habitable area to the
  outside (can not discharge through garage)
• Landing same width as door and 36 in direction
  of travel

43
Landing not required if a guardrail is provided
at a door no longer considered an egress door
44
No more than two risers for non-exit door swing
away from the stairway (R311.4.3)
45
Threshold may not be more than 1-1/2 to finished
floor (R311.4.3)
46
AN EXIT DOOR MUST BE SIDE-HINGED 36 WIDE
DISCHARGE TO THE OUTSIDE
A LANDING IS REQUIRED ON BOTH SIDES OF ANY EXIT
DOOR, AND THE DISTANCE BETWEEN THE THRESHOLD TO
SURFACE OUTSIDE CANNOT EXCEED 7 3/4
47
Ramps (R311.6)

• Ramps
• Max. Slope 1/12 or 8.3.
• Exception Where it is technically infeasible to
  comply use 1/8 or 12.5 slope.
• 3x3 Landing
• Top and Bottom
• Doors open onto ramps
• Change in direction

48

• Check the slope of the ramps

49
Stairways (R311.5)
Enclosed, accessible space under the stairs shall
be protected by ½ GB applied to ceiling and
wall. (R311.2.2) Minimum headroom in all parts of
stairway shall not be less than 6 feet 8 inches.
Handrails shall be provided on at least one side
of each continuous run of treads or flight with
four or more risers. Circular Stairs are removed
from the Section regarding special stairways.
50
Minimum Headroom (R311.5.2)
51
Minimum Width for Stairways (R311.5.1)
52
Riser Dimensions (R311.5.3)

• Delete Section R311.5.3. and replace
• R311.5.3 Stair treads and risers
• R311.5.3.1 Riser height - Max. 8-1/4 3/8
  variance within a flight.
• R311.5.3.2 Tread depth Min. 9 3/8 variance
  within a flight Min. 9 wide at a point 12 from
  the side where treads are narrower

53
Riser Dimensions (R311.5.3)

• Delete Exception 1 of R311.5.3.3. Profile and
  replace
• 1. A nosing is not required if the tread depth is
  10 min.

54
Riser Dimensions (R311.5.3)
8-1/4
9
RISER VARIATIONS (- 3/8)
55
Winder (R311.5.3.2)
56
Typical Winder
10
6
57
Winder with Landing
58
36
36
This winder can be considered a Landing
59
36
36
This winder cannot be treated as a landing
60
Spiral Stair (R311.5.8.1)
Riser height 9-1/2 / Minimum headroom 6-6
61
34-38
Handrail must continue to the bottom of the
stairway (R311.5.6.2)
62
34-38
Handrail dimensions for a stairway
63
Type I handrail
64
Type II handrail
65
This handrail does not provide equivalent
gripping area
66
Handrail is too wide gt 2-5/8
67
gt36
gt30
Porches more than 30 above grade require
guardrails with pickets
68
Decks and Porches more than 30 above grade
require guardrails with pickets
69
Smoke Alarms (R313)

• Smoke alarms are required
• In each bedroom
• Outside each separate sleeping area in the
  immediate vicinity of the bedrooms
• On each floor, including finished or unfinished
  basements

70
Smoke Alarms (R313)

• Smoke alarms shall be
• Inter-connected
• Permanently-wired
• Installed without a disconnecting switch
• Connected to commercial power
• Provided with Battery Backup
• This clause is removed The alarm shall be
  clearly audible in all bedrooms over background
  noise levels with all intervening doors closed.
  but with the new reference to NPFA 72 the
  requirement has not be changed

71
Insulation (R316) Moisture Vapor Retarders (R318)

• Vapor Barriers are required on the warm-in-winter
  side of perimeter walls, floors, and roof
  assemblies
• Insulation including facing materials must have a
• Flame spread index lt 25
• Smoke development index lt 450

72
This situation required the vapor barrier to be
in substantial contact with the floor sheathing
73
FSK
Vapor barrier is required behind the fireplace
74
Dwelling Unit Separation (R317)

• Two Family Dwellings
• Separated (horiz. and vert.) by at least a
  one-hour rated assembly
• Exception Only a half-hour rated assembly is
  required if units are sprinklered.
• Fire-rated walls and floors tight against
  exterior walls and extend to underside of roof
  sheathing
• Structural supports require equal or greater
  rating

75
Dwelling Unit Separation (R317)

• Townhouses
• Considered a separate building
• Separate one-hour rated wall assemblies
• Common two-hour rated assembly
• Common foundations permitted
• Structural roof and wall sheathing may fasten to
  common wall framing
• Separation wall(s) tight against exterior wall
  sheathing and extend to the underside of the roof
  sheathing.

76
4
4
Protection is provided to 4 each side of the
separation wall.
77
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78
1-HR RATED
Protective sheathing must be applied to at least
4 on each side of the separation wall.
79
Protection Against Decay (R319)

• Joists are lt 18 above ground
• Girders lt 12 above ground or in beam pockets
  with clearances lt ½ around sides, top and ends
• Sills or Plates
• Foundations lt 8 from above ground
• Slabs in direct contact with ground (unless
  separated from slab with moisture barrier)
• Wood sheathing, siding or framing lt 6 above
  ground

80
4
4
Girder Beam gt 12 above grade can be untreated
81
Protection Against Decay (R319)

• Sill Plates and Rim Boards at attached decks
• Exterior posts embedded in concrete
• Exterior posts supported by concrete, brick or
  wood in direct contact with ground
• Exception Posts or Columns supported by 1
  pedestals
• Exposed Glulam timbers
• Field Treatment per AWPA M4

82
4
4
Wood Columns need to be treated as they are in
contact with brick in contact with the ground
83
4
4
Column supported by pedestal does not need to be
treated
84

• Rim/Ledger needs to be treated

85
Protection Against Termites (R320)

• Methods
• Soil Treatment
• Baiting System
• Pressure Treated Wood
• Natural Termite Resistant Wood
• Physical Barriers

• Protection required for
• New Houses
• Additions

86
2006 IRC Changes

• Hurricane prone regions with wind speed equal to
  or exceeding 100 mph.
• Table 302.1. Exterior walls
• Ramps Max slope 1/12
• Elevators and Platform lifts This new section
  provides safety standards for the equipment.

87

• Questions?

88
IRC2006 Chapter 4 Foundations
89
Purpose of Chapter 4

• The provisions of this chapter regulate
  foundations designed and constructed under IRC
  code. In addition to foundations ability to
  support applied load, This chapter addresses
  other factors that can affect foundation
  performance. These include surface and subsurface
  water control, moisture control in basement and
  crawl space, minimum footing depth, etc.

90
Soil and Foundation

• Types of soils (USCS)
• Soil bearing capacity / Lateral soil pressure
• Footing/Soil interactions
• Minimum concrete footing width
• Foundation types Basements, crawl space, and
  slab on grade.

91
Presumptive load bearing values of foundation
materials (Table R401.4.1)
92
Minimum width of concrete or masonry footings
(Table R403.1)
93
Minimum Footing Depth

• At least 12 below grade
• Extend below frost line

94
Check footing width, reinforcement, frost depth,
and sub-grade is level ( Max 1/10 slope). Footing
shall be on and undisturbed natural soils or
engineered fill
95
Monolithic slab with integral footing
96
Drainage(R401.3)

• Lots shall be graded to drain surface water away
  from foundation walls
• Min. 6 within first 10 feet
• Min. 5 slope where physical restrictions exists
• Min. 2 for swales with 10 feet
• Min. 2 for impervious surfaces within 10 feet

97
Onsite runoff shall be directed away from the
foundation walls
98
Well Graded Site
99
Foundation Anchors (R403.1.6)

• ½ anchor bolts with min. 7 embedment
• Spaced 6 feet on center
• Min. two bolts per sill plate section with one
  bolt located not more than 12 or less than seven
  bolt diameter from each end of plate section.

100
This bolt is too close to the end of sill plate
101
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102
Prescriptive Foundation Wall Designs(R404)

• Masonry Foundation Walls
• Concrete Foundation Walls
• ICF Foundation Walls
• 10 high foundation walls are included

103
Laterally Supported Foundation Walls (R404.1)

• Full basement floor - 3 ½ thick
• Floor joist and blocking connected to sill plate
  per Table R404.1(1)
• Bolt spacing for sill plate shall be per Table
  R404.1(2)
• Floor blocked perpendicular to the floor joists.
• Where supporting unbalanced load on opposite
  sides of the building, the building aspect ratio
  L/W shall not exceed the value specified in Table
  R404.1(3)

104
Table R404.1(1)Top Reactions and Prescriptive
Support for Foundation Walls (Partial)
105
Table R404.1(2)Maximum Plate Anchor-Bolt Spacing
for Supported Foundation Wall (Partial)
106
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107
Table R404.1(5)Concrete Foundation Walls
(Partial)
108
Concrete Foundation Walls -Example

• Soil Type ML-CL
• Wall Height 8 feet
• Unbalanced Fill 7 Feet - 4 Inches
• Wall Thickness 6 inches
• Required Reinforcement 6 _at_ 27 o.c.

109
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110
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111
Retaining Walls(R404.5)

• Max. 24 unbalanced backfill
• Not laterally supported at the top
• Retaining wall shall be designed for a safety
  factor of 1.5 against lateral sliding and
  overturning.

112
Foundation Drains (R405)

• Where they are needed
• Foundation drain materials
• Construction details

113

• Drains shall be provided around all concrete or
• masonry foundations that retain earth and enclose
• habitable or usable spaces located below grade.
• ( except on well drained ground or Group I soils)

114

• Drainage tiles, gravel or crushed stone drains,
• perforated pipe or other approved system.

115
Foundation Waterproofing and Dampproofing (R406)

• Dampproofing
• Bituminous Coating
• 3lb/sq.yd. Acrylic Cement
• 1/8 coat Surface Bonding Cement
• Waterproofing Material
• Other Approved Methods

• Waterproofing
• 2-ply Hot Mopped Felt
• 55 lb Roll Roofing
• 6-mil PVC
• 6-mil Polyethylene
• 40-mil Polymer-Modified Asphalt
• 60-mil Flexible Polymer Cement
• 1/8 Cement-Based, Fiber-Reinforced, Waterproof
  Coating
• 60-mil Solvent-Free Liquid Applied Synthetic
  Rubber

116
Waterproofing/Dampproofing
117
Typical Details
118
Under Floor Space Ventilations(R408)

• Vented crawl space
• Unvented crawl space

119
Vented Crawl Space

• The minimum net area of ventilation openings
  (1150)
• Five exceptions in 2003 Code are removed. (i.e.
  11500 where ground surface is treated with vapor
  retarder materials)
• One ventilating opening shall be within 3 feet of
  each corner of the building

120
Unvented Crawl Space(R408.3)

• Exposed earth is covered with a continuous vapor
  retarder. (Overlap 6 sealed and taped / Extend
  edges 6 up the stem wall attached and sealed to
  the wall)
• Provide one of the following
• Continuous mechanical exhaust ventilation at
  1CFM/50 SF and perimeter walls insulated
• Conditioned air supply sized to deliver at rate
  of 1CFM/50 SF and perimeter wall insulated.
• Plenum complying with Section M1601.4 if
  under-floor space is used as a plenum.

121
2006 IRC Changes

• Added requirements for foundation drainage when
  6 in 10 feet can not be obtained
• Added requirements for support of foundation
  walls including anchor spacing
• New section for retaining walls
• New section for unvented crawl space

122

• Questions?

123
IRC 2006 Chapter 5 Floors
124
Purpose of Chapter 5

• The provisions of this chapter address the
  general performance requirements for floor
  system. Four types floor systems are covered in
  this chapter. They are wood floor framing, wood
  floors on the ground, steel floor framing and
  concrete slab on the ground.

125
Wood Floor Framing (R502)

• Solid sawn dimension lumbers
• End jointed lumbers
• Prefabricated wood I joists
• Engineered floor trusses
• Structural log members

126
Allowable Spans
Given 2X10 floor joists SPF 2 _at_ 12 O.C./ 10
PSF DL/30 PSF LL. What is the Max. span?
127
Floor Framing Details (R502.6-7)

• The end of each joist, beam or girder shall have
  Min. 1-1/2 of bearing on wood or metal. 3 on
  masonry and concrete
• Joists framing from opposite sides over a bearing
  support shall lap a minimum of 3 inches and be
  nailed with mini. 3-10d face nails.
• Joists shall be supported laterally at the ends
  by full depth solid blocking not less than 2
  nominal in thickness or full depth header, band
  or rim joist.

128
Drilling and Notching (R502.8)

• Notches in solid lumber (1/6 of depth, not longer
  than 1/3 depth, not be located in middle 1/3
  span)
• The diameter of holes (not exceed 1/3 depth. Not
  closer than 2 to top or bottom of the member)
• The engineered wood products (as permitted by
  manufacturer)

129
Proper Notching
130
Proper Drilling
131
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132
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133
Wood Trusses(R502.11)

• Design and manufacture of MPC wood trusses
  (ANSI-TPI 1 )
• Bracing
• Alterations to trusses
• Truss design drawings

134
Pre-manufactured Floor Truss System
135
Truss Drawing RequirementsR502.12.4

• Slope or depth, span and spacing
• Location of joints
• Bearing widths
• Design Loads
• Live and Dead for Top Bottom Chord
• Concentrated
• Wind Seismic
• Reactions

• Connections for
• Truss to Girder
• Ply to Ply
• Field Splices
• Axial forces in members
• Deflection ratio
• Permanent truss member bracing locations

136
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137
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138
Care of Trusses
139
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140
Pre-manufactured I-joist system
141
Drilling and Notching
142
Allowable span for structural panel (Table
R503.2.1.1(1))
143
Concrete Floors on Ground(R506)

• Concrete slab shall be min. 3-1/2 thick
• Area within the foundation walls shall have all
  vegetation and top soil removed.
• 4 inch thick base of clean sand or gravel or
  crushed stone or crushed blast-furnace slag.
  Exception A base course is not needed over Group
  I soil
• 6 mil polyethylene or approved retarder

144
Concrete Floor on Grade
145
Reinforcement Placement
Slab upper third line
Slab thickness
Slab center line
Slab on grade
146
2006 IRC Changes

• Added reference standard for structural log
  member.
• Added load path for lateral forces shall be
  provided between floor framing and braced wall
  panels located above or below a floor.
• Added the requirement that cuts, notches, and
  bored holes for engineered wood products are not
  permitted unless allowed by Manufacturer or by a
  RDP.
• Added reinforcement support requirements for
  slabs on grade

147

• Questions?

148
IRC2006 Chapter 6 Wall Construction
149
Purpose of Chapter 6

• The provisions of this chapter contain
  prescriptive requirements of the design and
  construction of walls and partitions for the
  support of the required dead, live, and snow
  loads. In addition, the walls are a key component
  in resisting the lateral forces attributable to
  earthquakes and wind.

150
Wood Wall Framing Materials(R602)

• Dimension lumbers
• End jointed lumber
• Structural glued laminated timber
• Structural log member

151
End Jointed Lumber (R602.1.1)
152
Wood Grade(R602.2)

• Minimum No.3 or stud grade lumber exception
  Bearing studs not supporting floors and
  nonbearing studs my be utility grade lumber

153
Allowable height and spacing of wall studs
154
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155
Wall Framing Details (R602.3)
156
Drilling and Notching

• Notches shall not exceed 25 width of the stud in
  Exterior or bearing walls ( not exceed 40 in
  nonbearing walls)
• Holes shall not be located in the same cross
  section of the notch
• The diameter of the hole shall not be more than
  60 of stud width. The edge of the hole shall not
  be less than 5/8 away from the edge of the stud.

157
Drilling and Notching

• Studs located in exterior walls or bearing walls
  drilled over 40 and up to 60 shall also be
  doubled with no more than two successive double
  studs bored.
• When cutting, drilling or notching of the top
  plate by more than 50 of its width, a galvanized
  metal tie of not less than 16 GA and 1-1/2 wide
  shall be fastened across the plate with not less
  than 8-16d nails at each side.

158
Proper Notching and Drilling
159
Proper Notching and Drilling
160
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161
Lateral load unbraced walls
wind
162
Lateral load braced walls
wind
163
Braced wall panel

• Unit of bracing
• Extend full height of the wall
• Measured by height and length

Height
Length
164
Braced wall lines
Braced wall line 1
Braced wall line 2
Braced wall line 4
Braced wall line 3
FLOOR PLAN
165
Braced wall line with offsets
4
Braced wall line
4
PARTIAL FLOOR PLAN
166
Wall Bracing (R602.10)

• Intermittent braced wall Method 1 to 8 as
  defined by R602.10.3
• Continuous wood structural sheathing (R602.10.5)
• Alternate braced wall (R602.10.6)
• Engineered design

167
Intermittent Braced walls
Braced Wall
Braced Wall
Braced Wall
No bracing required
No bracing required
Elevation
168
Intermittent Braced Wall
Braced Wall
Braced Wall
Braced Wall
lt25
lt12-6
Elevation
169
Braced Wall Methods (R602.10.3)
170
TABLE R602.10.1 (Seismic A and B or Wind lt 100
mph)
171
Wall Bracing
172
Alternate Braced Wall Panels (R602.10)

• Intermittent braced wall Method 1 to 8 as
  defined by R602.10.3
• Continuous wood structural sheathing (R602.10.5)
• Alternate braced wall (R602.10.6)
• Engineered design

173
Alternate Braced Wall Panels (R602.10)
174
2006 IRC Changes

• Clarified the requirements for top plate splices
  and notches
• Added section for Alternate Bracing Wall Panel
  Adjacent to a Door or Window Opening
• Added requirement for manufacturers instructions
  for window installation
• Clarified the location of the Wind-Borne Debris
  Protection areas

175

• Questions?

176
IRC 2006 - Chapter 7 Wall Covering
177
Interior Covering (R702)
178
Interior Plaster (R702.2)

• Three Coats over Metal Lath
• Two Coats over other Bases
• Support for Gypsum or Metal Lath
• 16 o.c. for 3/8 thick
• 24 o.c. for ½ thick

179
Interior Plaster (R702.2)
180
Gypsum Board (R702.3)

• Fastening per Table R702.3.5 or screws of Type W
  or S
• Thickness 3/8 to 5/8

• Diaphragm Ceilings
• 1 ½1 Aspect Ratio
• Not Cantilevered or Rotational
• Capacity from framing
• 16 o.c. 90 plf
• 24 o.c. 70 plf

181
Gypsum Board (R702.3)
182
Backing for Tile (R702.4.2)

• Wall tile in Tub and Shower areas and wall panels
  in Shower areas
• Cement ASTM C1288
• Fiber-Cement ASTM C1325
• Glass Mat ASTM C1178
• Green Board not permitted

183
Backing for Tile (R702.4.2)
184
Exterior Covering (R703)
185
General Requirements (R703.1)

• Provide a weather resistant exterior wall
  envelope
• Prevent accumulation of water in wall
• Water resistance barrier behind veneer
• Protection from condensation per Chapter 11

186
Water-Resistive Barrier (R703.2)

• Material behind an exterior wall covering to
  resist liquid water
• No. 15 asphalt felt, free from holes
• Approved water-resistive barrier

187
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188
Wood, Hardboard Wood Panel(R703.3)

• Vertical Joints over framing members
• Horizontal Joints lapped 1 min, shiplapped or
  flashed

189
Attachments (R703.4)

• Table R703.4
• Other Approved Fasteners
• Wind Speed at least 110 mph resist component and
  cladding load

190
Attachments (R703.4)
191
Wood Shakes and Shingles(R703.5)

• Single or Double Course over ½ sheathing or
  furring strips
• Attached with two hot-dipped, stainless or
  aluminum nails or staples

192
Exterior Plaster(R703.6)

• Lath and Lath attachments corrosion resistant
• Water-Resistive Barrier
• Vapor Permeable
• Equiv. to two layer of Grade D paper

193
Stone and Masonry Veneer(R703.7)

• Limited to 1 story above grade and 5 inch
  thickness
• Except per Table R703.7(1)
• Supporting Construction deflection limited to
  1/600
• Ties at least No. 9 gage at 24 o.c. each way
  supporting 2.67 sq of veneer, max

194
Table R703.7(1)
195
Stone and Masonry Veneer
196
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197
EIFS (R703.9)

• Per Manufacturers specifications
• Decorative trim not faced nailed
• Terminate at least 6 above grade

198
Vinyl Siding (R703.11)

• Labeled per ASTM D3679
• Siding, Soffit and accessories installed per
  manufacturer

199
2006 IRC Changes

• Added Horizontal Gypsum Diaphragms
• Added Water Resistive Barrier behind coverings
• Added Protection of Wood Sheathing behind Plaster
• Removed Provisions for Self-Flashing Windows

200
IRC 2006 - Chapter 8 Roof Framing
201
R801.2 Requirements Check and verify load path
202
Lumber Grade R802.1
203
Ridge Board (R802.3) 1 nominal thickness and
same depth as joists
204
Rafter connections 802.3.1 per Table R8-2.5.1(9)
205
R802.3.1 Ceiling Joist and rafter Connections
206
Ceiling Joist Connections R802.3
207
Ceiling joists as collar ties R802.3
208
Ceiling joist span R802.4 per Tables R802.4(1)
and (2)
209
Rafter span R802.5
Kneewall
Exterior Wall Toplate
210
Figure R802.5.1 Braced Rafter Construction

• What are the guidelines?

211
Rafter and Ceiling Joist Bearing (R802.6) 1-1/2
on Wood or Metal or 3 on Concrete
212
Notching of Rafters 802.7
213
Cutting and Notching Sawn Lumber R802.7.1
214
Cutting and Notching (R802.7.2) Engineered wood
products
Cut truss
215
Framed openings R802.9

• Frame with Header and Trimmer
• lt4 Header Single
• gt4 Header Double Header Trimmer
• gt6 Header Approved Hangers

216
R802.9 Framing of Openings
217
Wood Trusses (R802.10)

• Would this concern you?

218
Wood truss design R802.10.2
219
Wood truss drawings R802.10.1
220
Truss Drawing RequirementsR802.10.1

• Slope or depth, span and spacing
• Location of joints
• Bearing widths
• Design Loads
• Live and Dead for Top Bottom Chord
• Concentrated
• Wind Seismic

• Reactions
• Connections for
• Truss to Girder
• Ply to Ply
• Field Splices
• Axial forces in truss members
• Permanent truss member bracing locations

221
Truss Limits R802.10.2.1

• Trusses per ANSI/TPI 1
• 60 perpendicular to truss
• 36 parallel to truss
• Not more than 2 stories each 10 max

• Roof Slope
• 312 min
• 1212 max
• 110 mph wind max
• Exposures A, B, C
• 70 psf snow load max

222
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223
Wood truss bracing R802.10.3
224
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225
Roof tie downs R802.11 per Table R802.11
226
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227
Broken Truss?
228
This is the plan for the trusses.
229
Are Trusses braced to plan?
230
Roof Sheathing R803
231
Roof VentilationR806

• Openings 1/8 to ¼
• Openings 1/150
• 1/300 with Ridge and Eave vents
• 1/300 for ceiling with vapor barrier
• 1 air space above insulation

• Unvented Conditioned Attic
• No Vapor Barrier at ceiling
• Air-impermeable insulation to roof deck
• Condensing Surface above 45 degrees

232
What type of venting is specified?
233
How would you vent this?
234
Proper framed opening?
235
Another View
236
Proper Connection?
237
So what is the problem?
238
Girder trusses must be connected per truss plan.
Check nailing.
239
Are these girder trusses working together?
240
Another View
241

• Questions?

242
IRC 2006 - Chapter 9 Roof Covering
243
Hail Exposure (903.5)

• Requirements based on 20 year return period
• Moderate 1.5 Hail
• Severe 2.0 Hail
• No Exposure area in Maryland

244
Asphalt Shingles R905.2
Ice Damming Protection where required
245
Wind Resistance of Shingles (R905.2.4.1)

• Wind Speed 110 mph or greater
• ASTM D3161, Class F
• Noted on shingle wrappers
• Special Fastening requirements apply

246
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247
(No Transcript)
248
Ice Barrier(R905.2.7.1)

• Removed temperature criteria
• Changes to history of ice forming
• Replaces eave edge with lowest edges of all
  roof surfaces

249
Tile and Clay Roofing R905.3
250
Built-up Roofing R905.5
251
Slate Shingle R905.6 412 Pitch min
252
Wood Shakes R905.8 312 Pitch min
253
Metal Roofing R905.10 Corrosion Resistance
254
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255
2006 IRC Changes

• Added Hail Exposure
• Added Shingle Packaging requirements High Wind
• Modified Ice Barrier Requirements
• Clarified Recovering versus Replacement

256

• Questions?

257
IRC 2006 - Chapter 11Energy Efficiency
258
Certificate (N1101.8)

• Permanently posted on the electrical panel
• R-values
• Ceiling/Roof
• Walls
• Foundation
• Ducts

• U-factors for fenestration
• SHGC for fenestration
• HVAC efficiencies
• SWH equipment

259
Climate Zones2006 IRC
260
Climate Zones2006 IRC
261
IRC Requirements

• Focus - building envelope
• Ceilings, walls, windows, floors, foundations
• Insulation levels, window U-factors and solar
  heat gain coefficients
• Air leakage
• Moisture Control
• Ducts seal and insulate
• HVAC equipment per Mechanical
• No lighting or appliance requirements

262
Scope

• Residential Buildings
• IRC only for single-family, duplex, and
  townhouses
• Includes repairs, alterations, and additions
• e.g., window replacements

263
Climate Specific Requirements

• Foundations
• Basements
• Slabs
• Crawlspaces
• Above grade walls
• Skylights, windows, and doors
• Roofs
• Solar Heat Gain Coefficient in warm climates
• Vapor retarders in cold climates

264
Universal Requirements

• Duct insulation and sealing
• Infiltration control
• Including recessed cans

265
Table N1102.1Insulation and Fenestration
266
U-factor Alternative (N1102.1.2)

• Uses U-factors instead of R-values

267
Total UA Alternative (N1102.1.3)

• Allows trade-offs across all envelope components
• Approach used in REScheck software

268
Specific Insulation Requirements (N1102.2)

• Ceilings/Attics
• Mass walls
• Steel Frame walls
• Floors
• Basement walls
• Slab
• Crawl space

attic
269
Ceilings

• Requirements based on
• Attic
• Assembly type
• Continuous insulation vs. Insulation between
  framing

270
Raised Heel Truss (N1102.2.1)

• Full height over exterior wall
• R-30 instead of R-38
• R-38 instead of R-49

271
Mass Walls (N1102.2.3)

• Concrete block, concrete, insulated concrete form
  (ICF), masonry cavity, brick (other than brick
  veneer), earth, and solid timber/logs
• Requirements
• At least 50 of the required R-value must be on
  the exterior or integral to the wall
• If insulation placement cannot be met, provisions
  for wood frame wall insulation requirements apply
  (with specific U-factor and R-value exceptions in
  zones 15)

272
Above Grade Walls
Insulate walls including those next to
unconditioned spaces
Dont forget to insulate rim joists
273
Floors (N1102.2.5)

• Insulation must maintain permanent contact with
  underside of subfloor

• Zones 12 R13
• Zones 34 R19
• Zones 4M8 R30

274
Basement Walls (N1102.2.6)

• ? 50 below grade
• Zones 13 R0
• Zones 48 R10 (cont.) or R13 (cavity)

275
Defining Below-Grade Walls
276
Slab Edge Insulation(N1102.2.7)

• Zone 1-3 No Insulation Required
• Zone 4-8 R-10
• Downward from top of slab a minimum of 24 (Zones
  4 and 5) or 48 (Zones 6, 7, and 8)
• Insulation can be vertical or extend horizontally
  under the slab or out from the building (must be
  under 10 inches of soil)

277
Slab Edge Insulation
278
Crawlspace Walls (N1102.2.8)

• With insulated crawlspace walls, the space must
  be mechanically vented or conditioned. (R408.3)

279
Additions

• Treat as a stand-alone building
• Additions must meet the prescriptive requirements
  in Table 402.1.1

280
Thermally Isolated Sunrooms(N1102.2.10)

• Sunroom Attached to Structure with glazing area
  gt 40
• Separation per Thermal Envelope Requirements
• Ceiling
• Zone 1-4 R-19
• Zone 5-8 R-24
• Walls R-13
• Zone 4-8
• Fenestration U lt 0.50
• Skyline U lt 0.75

281
Fenestration (N1102.3)

• An area weighted average of fenestration can be
  used to satisfy the U-factor SHGC requirements
• Zone 6-8 Hard Limits
• Fenestration lt 0.55
• Skyline lt 0.75
• 15 sq. ft. of glazing and one opaque door may be
  exempted
• Fenestration replacement must meet requirements
  of Table N1102.1

282
Windows - SHGC (N1102.3.2)
Solar Heat Gain Coefficient

• Solar Heat Gain Coefficient
• Zone 1-3 SHGC of 0.40 or lower required
  (area-weighted average)
• All fenestration more than 50 glazed

283
Locations with SHGC Requirements
284
Mandatory Requirements Building Envelope

• Air leakage
• Thermal Envelope
• Fenestration
• Recessed lighting
• Moisture control

285
Air Leakage Envelope(N1102.4.1)

• Joints, Seams, Penetrations
• Site built windows/doors
• Between jamb frame
• Utility Penetrations
• Dropped Ceiling/Chase
• Knee Walls
• Tubs Showers
• Common Walls

286
Areas for Air Leakage
287
Recessed Lighting (N1102.4.3)

• Type IC rated and labeled in a sealed or gasketed
  enclosure
• Type IC rated and labeled per ASTM E 283 with no
  more than 2.0 cfm of air movement
• In airtight box at least 0.5 inch from
  combustible material and 3 inches from
  insulation

288
Moisture Control (N1102.5)

• Install on warm-in-winter side of insulation
• Use in unvented framed walls, floors, and
  ceilings
• Exceptions
• Moisture or its freezing will not damage
  materials
• Other approved means provided
• Zone 1-4

289
Vapor Retarder
290
Maximum U-Factors(N1102.5.1)

• Strict limits on U-factor in northern U.S.
  (cannot be traded off)
• Based on weighted building average individual
  windows or skylights can be worse
• Zone 6-8
• Windows U-0.55
• Skylights U-0.75

291
Systems (N1103)

• Controls
• Heat pump supplementary heat
• Ducts
• Sealing
• Insulation

• HVAC piping insulation
• Circulating hot water systems
• Ventilation
• Equipment Sizing

292
Ducts (N1103.2)

• Insulation
• R-8 outside the building envelope
  
• R-6 in floor trusses
• Sealing
• Per M1601.3.1
• Building Cavities
• Not be used as supply ducts

293
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294
Piping Insulation (N1103.3 and N1103.4)

• R-2 Insulation
• HVAC systems
• Exception Piping that conveys fluids between 55
  and 105F
• Circulating domestic hot water systems

295
Ventilation Equipment Sizing (N1103.5 and
N1103.6)

• Ventilation
• Outdoor air intakes and exhausts shall have
  automatic or gravity dampers that close when the
  ventilation system is not operating
• Equipment Sizing
• Per IRC M1401.3

296
Mechanical Systems Equipment

• Equipment efficiency set by Federal law, not the
  building code

297
2006 IRC Changes

• Format - New climate basis
• Envelope requirements independent of window-wall
  ratio
• Duct R-value (8) cannot be traded off
• Compliance Certificate

298

• Questions?

299
IRC 2006 Appendix J Existing Buildings and
Structures
300
Classification of Work

• Repair
• Renovation
• Alteration
• Reconstruction

301
Repairs

• The patching, restoration and/or minor
  replacement of materials, elements, components,
  equipment and/or fixtures for the purpose of
  maintaining those materials, elements and/or
  fixtures in good and sound condition.

302
Requirements for Repairs

• Materials Work shall be done using like
  materials
• Except 1. Hazardous materials such as asbestos
  and lead based paint
• 2. Plumbing materials and supplies
  outlined in AJ301.1.2
• Replacement Water closet Per P2903.2
• Replacement Safety Glazing per R308.1
• Repair and replacement of existing electrical
  wiring and equipment per Chapters 33 through 42

303
Renovation

• The change, strengthening or addition of
  load-bearing elements and/or the refinishing,
  replacement, bracing, strengthening, upgrading or
  extensive repair of existing materials, elements,
  components, equipment and/or fixtures. Renovation
  involves no reconfiguration of spaces.

304
Requirement for Renovations

• Materials and Method the materials and method
  per requirement of this code
• Door and window dimensions Minor reduction that
  result from the use of different materials shall
  be allowed whether or not they are permitted by
  this code
• Interior finish Wood paneling and textile wall
  covering per R315

305
Alterations

• The reconfiguration of any space, the addition
  or elimination of any door or window, the
  reconfiguration or extension of any system, or
  the installation of any additional equipment.

306
Requirement for Alterations

• Newly constructed elements shall comply with this
  code
• The work shall not increase the extent of
  noncompliance
• Work area shall be less than 50 of dwelling unit
  
• Structural loads shall be the loads applicable at
  the time the building was constructed.
• Unsound or dangerous structural elements
  uncovered during the alteration shall be made to
  comply with this code
• Electrical equipment and wiring per AJ501.5

307
Reconstruction

• The reconfiguration of a space that affects an
  exit, a renovation and /or alteration when the
  work area is not permitted to be occupied because
  existing means of egress and fire protection
  systems. or their equivalent, are not in place or
  continuously maintained and/or there are
  extensive alterations per AJ501.3

308
Requirement for Reconstruction

• Stairway, handrails, and guards per AJ601.1
• Wall and ceiling finish per R315
• Separation walls use construction materials
  consistent with the existing wall or complying
  with requirements for new structures.
• Ceiling height 6-8 ceiling in habitable spaces
  created in existing basement shall be permitted.
  Obstructions may project to 6-4 above basement
  floor. Existing finished ceiling height in
  non-habitable spaces in basements shall not be
  reduced.

309
2006 IRC Changes

• Added requirements under Alternation for Ceiling
  Height and Stairs
• Added Requirement under Reconstruction for
  Ceiling Height