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CITY OF TIGARD
Building Division •
T I GARD
City of Tigard
RESIDENTIAL PLAN CHECKLIST
2005 EDITION OF THE OREGON RESIDENTIAL SPECIALTY CODE
STRUCTURAL AND MECHANICAL REQUIREMENTS
PROJECT ADDRESS:
PERMIT NUMBER: •
This checklist contains excerpts from the building code and is in no way meant to represent the entire code.
Construction must comply with applicable code requirements. Approved plans must be kept on the job site.
Buildings must be built to conform to the approved plans. Plan changes require Building Division approval and
may require designer approval. Refer to the building permit card for required inspections. Final inspection and
approval required before occupancy. The City of Tigard is in Seismic Zone Dl, effective April 1, 2005.
Definitions:
HABITABLE SPACE is the space in a building for living, sleeping, eating or cooking. Bathrooms, toilet
rooms, closets, halls, storage or utility spaces and similar areas are not considered habitable spaces.
Location on Lot:
1. Exterior walls with a Fire Separation Distance less than 3 feet shall have not less than one -hour fire -
resistive rating with exposure from both sides. Projections hall not extend to a point closer than 2 feet
from the property line or the line used to determine the fire separation distance. See Section R302.1
EXCEPTION: Detached garages accessory to a dwelling located within 2 feet of a lot line
shall be permitted to have roof eave projections notexceeding 4 inches. Tool and storage
sheds, playhouses and similar structures exempted from permits by R105.2 are not required to
provide wall protection based on location on the lot. Projections beyond the exterior shall not
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extend over the property line. Refer to Section R302.1
2. Projections extending into the fire separation distance shall have not less than 1 hour fire -rated
construction on the underside. See Section R302.1.
3. Openings shall not be permitted in the exterior wall which is parallel to the property line and within the
fire separation distance; however, openings are permitted in walls that are perpendicular to the property
line.
EXCEPTION: Foundation vents installed per code are permitted.
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Site Address:
4. Premises identification. Approved number or addresses shall be provided for all new buildings in such a
position as to be plainly visible and legible from the street or road fronting the property. Section R321.1
Light and Ventilation:
5. Habitable room glazing. All habitable rooms shall be provided with aggregate glazing area of not less
than 8 percent of the floor area of such rooms. Natural ventilation shall be through windows, doors,
louvers or other approved openings to the outdoor air. The minimum openable area to the outdoors
shall be 4 percent of the floor area being ventilated. Section R303.1
EXCEPTIONS:
1. The glazing areas need not be openable where the opening is not required by Section R310
Emergency Escape and Rescue Openings and an approved mechanical ventilation system is
provided capable of producing 0.35 air change per hour in the room or a whole -house
mechanical ventilation system is installed, capable of supplying outdoor ventilation air of 15
cubic feet per minute (cfm) per occupant computed on the basis of two occupants for the first
bedroom and one occupant for each additional bedroom.
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2. The glazed areas need not be provided in rooms where EXCEPTION I above is satisfied
and artificial light is provided capable of producing an average illumination of 6 footcandles
(6.46 lux) over the area of the room at a height of 30 inches above the floor level.
6. Bathroom or spa facilities: All bathrooms or combination of rooms thereof with bathing or spa
facilities shall be provided with a mechanical ventilation system and shall be designed to have the
capacity to exhaust the minimum flow rated determinate in accordance with Section M1506.4, i.e. 50 cfm
intermittent or 20 cfm continuous R.303.3.1
Bathrooms without bathing or spa facilities: Bathrooms, water closet compartments and other
similar rooms shall be provided with aggregate glazing area in windows of not less than 3 square feet,
one -half of which must be openable. Section R303.3.2
EXCEPTION:
The glazed areas shall not be required where artificial light and a mechanical ventilation system
are provided. The minimum ventilation rates shall be 50 -cfm for continuous ventilation for
rooms which are 75 square feet or less in area. For rooms larger than 75 square feet, the
intermittent ventilation system shall be capable of producing a change of air every 12 minutes
or 20 -cfm for continuous ventilation. Ventilation sir from the space shall be exhausted directly
to the outside.
7. Safety glazing shall be installed in all locations considered to be hazardous The locations are as
follows:
1. Glazing in swinging doors except jalousies.
2. Glazing in fixed and sliding panels of sliding door assemblies and panels in sliding and bifold closet
door assemblies.
3. Glazing in storm doors.
4. Glazing in all unframed swinging doors.
5. Glazing in doors and enclosures for hot tubs, whirl- pools, saunas, steam rooms bathtubs and
showers. Glazing in any part of a building wall enclosing these compartments where the bottom
exposed edge of the glazing is less than 60 inches measured vertically above any standing or walking
surface.
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6. Glazing, in an individual fixed or operable panel adjacent to a door where the nearest vertical edge is
within a 24 inch arch arc of the door in a dosed position and whose bottom edge is less than 60
inches above the floor or walking surface.
7. Glazing in an individual fixed of operable panel, other than those locations described in items 5 and
6 above that meets all of the following conditions.
7.1. Exposed area of an individual pane greater than 9 square feet.
7.2. Bottom edge less than 18 inches above the floor.
7.3. Top edge greater than 36 inches above the floor.
7.4. One or more walking surfaces within 36 inches above the floor.
8. All glazing in railings regardless of an area or height above a walking surface. Included are
structural baluster panels and nonstructural in -fill panels.
9. Glazing in walls and fences enclosing indoor and outdoor swimming pools, hot tubs where the
bottom edge of the glazing is less than 60 inches above a walking surface and within 60 inches
horizontally of the water's edge. This shall apply to single glazing and all panes in multiple glazing.
10. Glazing adjacent to stairways, landings and ramps within 36 inches horizontally of a walking surface
when the exposed surface of the glass is less than 60 inches above the nose of the tread.
11. Glazing adjacent to stair ways within 60 inches horizontally of the bottom tread of the stairway in
any direction when exposed surface of the glass is less than 60 inches above the nose of the tread. •
EXCEPTION: The following products, materials and uses are exempt from the above
hazardous locations:
1. Openings in doors through which a 3 -inch (76 mm) sphere is unable to pass.
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2. Decorative glass in Item 1, 6 or 7.
3. Glazing in Section R308.4, Item 6, where there is an intervening wall or other permanent
barrier between the door and the glazing.
4. Glazing in Section R308.4, Item 6, in walls perpendicular to the plane of the door in a
closed position or where access through the door is to a closet or storage area 3 feet (914
mm) or less in depth. Glazing in these applications shall comply with Section R308.4, Item
7.
5. Glazing in Section R308.4, Item 7 and 10, when a protective bar is installed on the
accessible side(s) of the glazing 36 inches ± 2 inches (914 mm x 51 mm) above the floor.
The bar shall be capable of withstanding a horizontal load of 50 pounds per lineal foot
(74.5 kg /m) without contacting the glass and be a minimum of 1 inches (38 mm) in
height.
6. Outboard panes in insulating glass units and other multiple glazed panels in Section
R308.4, Item 7, when the bottom edge of the glass is 25 feet (7620 mm) or more above
grad, a roof, walking surface or other horizontal [within 45 degrees (0.79 rad) of horizontal]
surface adjacent to the glass exterior.
7. Louvered windows and jalousies complying with the requirements of Section R308.2.
8. Mirrors and other glass panels mounted or hung on a surface that provides a continuous
backing support.
9. Safety glazing is Section R308.4, Items 10 and 11 is not required where:
9.1 The side of a stairway, landing or ramp has a guardrail or handrail, including
balusters or in -fill panels, complying with the provisions of Sections 1012 and
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1607.7 of the Oregon Structural Specialty Code.
9.2 The plane of the glass is greater than 18 inches (457 mm) from the railing.
8. Required heating. Every dwelling unit shall be provided with heating facilities capable of maintaining a
minimum room temperature of 68 °F (20 °C) at a point 3 feet above the floor and 2 feet from exterior
walls in all habitable rooms at the design temperature. Section R303.8
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Minimum Room Areas and Ceiling Height:
9. Every dwelling unit shall have at least one habitable room that shall have not less than 120 square feet of
floor area. Other habitable rooms shall have a floor area of not less than 70 square feet. Habitable
rooms, except kitchens, shall not be less than 7 feet in any horizontal dimension. See Section R304.
10. Habitable rooms, hallways, corridors, bathrooms, toilet rooms, laundry rooms and basements, shall have
a ceiling height of not less than 7 feet. The required height shall be measured from the finished floor to
the lowest projection from the ceiling. Section R305
EXCEPTIONS:
1. Beams and girders spaced not less than 4 feet on Center may project not more then 6 inches below
the required ceiling height.
2. Ceilings in basements without habitable spaces may project to within 6 feet, 8 inches of the finished
floor; and beams, girders, ducts or other obstructions may project to within 6 feet 4 inches of the
finished floor.
3. Not more than 50 percent of the required floor area of a room or space is permitted to have a sloped
ceiling less than 7 feet in height with no portion of the required floor area less than 5 feet in height.
4. Not more than 75 percent of the floor area of a bathroom or toilet is permitted to have a sloped
ceiling less than 7 feet in height, provided an area of 21 inches by 24 inches is front of toilet and
lavatories has a minimum of 6 feet, 4 inches in height, measured from the finished floor. An area of
24 inches by 30 inches is front of and inside a tub shower shall have a minimum of 6 feet, 4 inches in
height, measured from the standing surface of the fixture.
Toilet, Bath and, Shower Spaces:
11. Fixtures shall be spaced as shown in Figure R307.2 Minimum Fixture Clearances. Section R307.1
12. Bathtub and shower floors and walls above bathtubs with installed showerheads and in shower
compartments shall be finished with a nonabsorbent surface. Such wall surfaces shall extend to a height
of not less than 6 feet above the floor. Section R307.2
Exits:
13. Exit Door. Not less than one side hinged 3' -0" x -6'-8" exit door shall be provided from each dwelling
unit The required exit door shall provide for direct access from the habitable portions of the dwelling to
the exterior without requiring travel through a garage or carport. All egress doors shall be readily
openable from the side from which egress is to be made without the use of a key or special knowledge
or effort. See Sections 8311.1., R311.2 & R311. 4
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14. Hallway. The minimum width of a hallway shall be not less than 3 feet. Section R311.3
15. Attachment. Required exterior exit balconies, stairs and similar exit facilities shall be positively anchored
to the primary structure to resist both vertical and lateral forces. Such attachment shall not be
accomplished by use of toenails or nails subject to withdrawal. Section R311.2.1
Clothes Dryer Exhaust:
16. Dryer exhaust systems shall be independent of all other systems, shall convey the moisture to the
outdoors and shall terminate on the outside of the building. Exhaust duct terminations shall be made
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with a full opening exhaust outlet or in accordance with the dryer manufacturer's installation
instructions. Screens shall not be installed at the duct termination. Exhaust ducts shall not be connected
with sheet -metal screws or fastening means which extend into the duct. Exhaust ducts shall be equipped
with a back -draft damper. The entire exhaust system, excluding transition ducts, shall be supported and
secured in place. Exhaust ducts shall be constructed of minimum 0.016 - inch -thick rigid metal ducts,
having smooth interior surfaces with joints running in the direction of airflow. Flexible transition ducts
used to connect the dryer to the exhaust duct system shall be limited to single length, not to exceed 8
feet in length. Transition ducts shall not be concealed within construction. Section M1501.1
a) Exhaust duct size. The diameter of the exhaust duct shall be 4 inches or as required by the cloths
dryer's listing and the manufacturer's installation instructions. Section M1501.2.1
b) Length limitation. The maximum length of a clothes dryer exhaust duct shall not exceed 25 feet
from the dryer location to the wall or roof termination. The maximum length of the duct shall be
reduced 2.5 feet for each 45- degree bend and 5 feet for each 90- degree bend. The maximum length
of the exhaust duct does not include the transition duct. Section M1501.1. See Section M1501.3 for
Exception.
Emergency Escape and Rescue Openings:
17. Emergency Escape and Rescue. Basements with habitable spaces and every sleeping room shall have
at least one openable emergency escape and rescue opening. Where basements contain one or more
sleeping rooms, emergency egress and rescue openings shall be required in each sleeping room, but shall
not be required in adjoining areas of the basement. Where emergency escape and rescue openings are
provided they shall have a sill height of not more than 44 inches above the floor. Where a door opening
having a threshold below the adjacent ground elevation serves as an emergency and rescue opening and
is provided with a bulkhead enclosure, the bulkhead enclosure shall comply with Section R310.3. The
net clear opening dimensions required by this section shall be obtained by the normal operation of the
emergency escape and rescue opening from the inside. Escape and rescue and rescue openings with a
finished sill height below the adjacent ground elevation shall be provided with a window well in
accordance with Section R310 2 Section R310. 1
a) Minimum opening area. All emergency escape and rescue opening shall have a minimum net dear
opening of 5.7 square feet.
EXCEPTION: Grade floor openings shall have a minimum net clear opening of 5 square feet
Section R310. I .1
b) Minimum opening height. The minimum net clear opening height shall be 22 inches. Section
R310.1.2
c) Minimum opening width. The minimum net clear opening width shall be 20 inches. Section
R310.1.3
d) Opening constraints. Emergency escape and rescue openings shall be operational from the inside
of the room without the use of keys or tools. Section R310.1.4
Landings
18. Landings at doors: There shall be a floor or landing on the interior side of each exterior door. There .
shall be a floor or landing on the exterior side of the'required exit door described in Section R311.1. The
interior floor or landing at a door shall not be more than 1.5 inches lower than the top of the threshold.
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The exterior landing at the required exit doors shall not be more than 8 inches below the top of the
threshold, provided the door does not swing over the landing.
EXCEPTION: Exterior storm or screen doors. Section 8311.4.3
At stairs: There shall be a floor or landing at the top and bottom of each stairway.
EXCEPTION: At the top of a flight of Stairs, provided a door does not swing over the Stairs.
Section R311.5.4
Size: The width of each landing shall not be less than the stairway or door served. Every landing shall
have a minimum dimension of 36 inches measured in the direction of travel. Sections R311.4.3 &
R311.5.4
Stairways:
19. Width: Stairways shall be not less than 36 inches in clear width at all points above the permitted handrail
height and below the required headroom height. Handrails shall not project more than 4.5 inches on
either side of the stairway and the minimum clear width at and below the handrail height, including
treads and landings, shall not be less than 31.5 inches where a handrail is installed on one side and 27
inches where handrails are provided on both sides
EXCEPTIONS:
1. The width of spiral stairways shall be in accordance with Section 8311.5.8.
2. Where a floor is served by more than one stairway, stairways other than the first stairways my
have a clear width of not less than 30 inches. Any handrail may encroach a maximum of 4.5 inches
into the clear width. Section R311.5
a) Treads and risers: The maximum riser height shall be 8 inches and the minimum tread depth shall
be 9 inches. The riser height shall be measured vertically between the leading edges of the adjacent
treads. The tread depth shall be measured horizontally between the vertical planes of the foremost
projection of adjacent treads and at a right angle to the tread's leading edge. The walking surface of
treads and landings of a stairway shall be sloped no steeper than one unit vertical in 48 units
horizontal (2- percent slope). The greatest riser height within any flight of stairs shall not exceed the
smallest by more than5 /8 inch. The greatest tread depth within any flight of stairs shall not exceed
the smallest by more than 3/8 inch. Section R311.5.3
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b) Profile: The radius of curvature at the leading edge of the tread shall be no greater than 9/16 inch. A
nosing not less than 3/4 inch but not more than 1 -1/4 inches shall be provided on stairways with
solid risers. The greatest nosing projection shall not exceed the smallest nosing projection by more
than 3/8 inch between two stories, including the nosing at the level of the floors and landings.
Beveling of nosing shall not exceed 1/2 inch. Risers shall be vertical or sloped from the underside of
the leading edge of the tread above at an angle not more than 30 degrees from the vertical. Open
risers are permitted, provided that the opening between treads does not permit the passage of a fl-
inch- diameter sphere. Section R311.5.3.3
EXCEPTIONS:
1. A nosing is not required where the tread depth is a minimum of 10 inches.
2. The opening between adjacent treads is not limited on stairs with a total rise of 30 inches or
less.
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c) Steps: The rise of a step or steps exclusive of a threshold shall not be less than 4 inches or greater
than 8 inches. Section R311.5.3.4
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d) Slope: Where the top or bottom riser adjoins a slopping walk, garage floor or driveway, the top or
bottom riser may be reduced to less than 4 inches in height with the variation height of the riser not
to exceed 3 inches in every 3 feet of walk or stairway width. Section R311.5.3.5
e) Headroom: The minimum headroom in all parts of the stairway shall not be less than 6 feet 8 inches
measured vertically from the sloped plane adjoining the tread nosing or from the floor surface of the
landing platform. Section R311.5.2
f) Winders: Winder treads shall have a minimum tread depth of 9 inches measured as above at a point
12 inches from the side where the treads are narrower. Winders tread shall have a minimum tread
depth of 6 inches at any point. Within any flight of stairs, the greatest winder tread depth at the 12
inch walk line shall not exceed the smallest by more than 3/8 inch. Section R311.5.3.2
g) Spiral Stairways: See Sections R311.5.8.
h) Circular stairways: Circular stairways shall have a treasi„cth'at point not more than 12 inches
from the side where the treads are narrower of not less than 9: niches and the minimum depth of any
tread shall not be less than 6 inches. See Section R311.5.8.
i) Stairway illumination: All interior and exterior stairways shall be provided with a means to
illuminate the stair, including landing and treads. Interior stairways shall be provided with an artificial
light source located in the immediate vicinity of each landing of the stairway. (See Section R303.6 for
exception)
Ramps:
20. Ramps shall have a maximum slope of 1 unit vertical in 8 units horizontal (12.5 %). Handrails shall be
provided on at least one side of ramps exceeding a slope of 1 unit vertical in 12 units horizontal
(8.33 %). A minimum 3 -foot x 3 -foot landing is required at the top and bottom of ramps, where doors
open onto a ramp and where a ramp changes direction. See Section 311.6.
Accessibility: Dwelling units required to be accessible by ORS 447.231 shall comply with Chapter
11 of the State of Oregon, 2004, Structural Specialty Code.
Handrails and Guards:
21. Handrails shall be provided on at least one side of each continuous run of the stair or a flight with four
or more risers.
The continuous handrail required for winders shall be located on the side where the tread is narrower.
Sec. R311.5.6
a) Handrails height, measure vertically from the sloped plane adjoining the tread nosing, or finish surface
of ramp slope, shall be not less than 30 inches and not more than 38 inches. Section R311.5.6.1
b) Continuity: handrails for stairways shall be continuous for the full length of the flight, from a point
directly above the top riser of the flight to a point directly above lowest riser of the flight. Handrail
ends shall be returned or shall terminate in newel posts or safety terminals. Handrails adjacent to a
wall shall have a space of not less than 1 1/2 inch between the wall and the handrail. Section
R311.5.6.2
EXCEPTIONS:
1. Handrails shall be permitted to be interrupted by a newel post at the turn.
2. The use of a volute, turnout, starting easing or starting newel shall be allowed over the lowest
tread
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c) Handrail grip size. All required handrails shall be of one of the following types or provide
equivalent graspability. Section R311.5.6.3
1. Type I. Handrails with a circular cross section shall have an outside diameter of at least 1 inches
and not greater than 2 inches. If the handrail is not circular it shall have a perimeter dimension of
at least 4 inches and not greater than 6 1 /4 inches with a maximum cross section of dimension of
2 inches.
2. Type II. Handrails with a perimeter greater than 6 1 /4 inches shall provide a graspable finger recess
area on both sides of the profile. The finger recess shall begin within a distance of 3 /4 inch
measured vertically from the tallest portion of the profile and achieve a depth of at least 5/16
inch with 7/8 inch below the widest portion of the profile. The minimum width of the handrail
above the recess shall be 1 1 /4 inches to a maximum of 2 3 /4 inches. Edges shall have a minimum
radius of 0.01 inches.
22. Guards:
a) Guards required: porches, balconies or raised floor surfaces located more than 30 inches above the
floor or ade below shall have guards not less than 36 inches in height. Open en sides of stairs with a
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total rise of more than 30 inches above the floor or grade below shall have guards not less than 34
inches in height measured vertically from the nosing of the treads. Section R312.1
b) Guard opening limitations: Required guards on open side of stairs, raised floor area, balconies and
porches shall have intermediate rails or ornamental closures that do not allow passage of a sphere 4
inches or more in diameter. Section R312.2
EXCEPTIONS:
1. The triangular openings formed by the riser, tread and bottom rail of a guard at the open side
of a stairway are permitted to be of such size that a sphere 6 inches cannot pass through.
2. Openings for required guardrails on open sides of stair shall not allow passage of a sphere 5
inches or more in diameter to pass through. Opening limitations for required guardrails on
open sides of stairways are applicable above, the second riser of the stair.
Smoke Alarms:
23. Smoke Alarms - Section R313
a) Single- and multiple- station smoke alarms shall be installed in the following locations:
1. In each sleeping rooms.
2. Outside of each separate sleeping area in the immediate vicinity of the bedrooms.
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3. On each additional story of the dwelling, including basements and cellars but not including
crawl spaces and uninhabitable attics. In dwellings or dwelling units with split levels and
without an intervening door between the adjacent levels, a smoke alarm installed on the
upper level shall suffice for the adjacent lower level provided that the lower level is less than
one full story below the upper level.
b) Activation. When more than one smoke alarm is required to be installed within an individual
dwelling unit the alarm device shall be interconnected in such a manner that the actuation of
one alarm will activate all of the alarms in the individual unit. All smoke alarms shall be listed
and installed with the provisions of this code.
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c) Prohibited locations. Required smoke alarms shall not be located within kitchens or garages, or
in other spaces where temperatures can fall below 40° F (4 °C). Ionization smoke alarms shall
not be located closer than 3 feet horizontally from the following:
1. The door to a kitchen.
2. The door to a bathroom containing a tub or shower;
3. The supply registers of a forced air heating or cooling system, outside the airflow from those
registers
d) A smoke alarm installed within 20 feet (direct linear path) of a cooking appliance shall be a
photoelectric -type smoke alarm or the alarm shall have an approved alarm silencing means.
e) Alterations, repairs and additions. When interior alterations, repairs or additions requiring a
structural permit occur, or when one or more sleeping rooms are added or created in existing
dwellings, the individual dwelling unit shall be provided with smoke alarms located as required
for new dwellings; the smoke alarms shall be interconnected and hard wired. See Section
R313.1.
EXCEPTIONS:
1. Smoke alarms in existing areas shall not be required to be interconnected and hard
wired where the alterations or repairs do not result in the removal of interior wall
or ceiling finishes exposing the structure.
2. Repairs to the exterior surface of dwellings are exempt form the requirements of
this section.
t) New buildings power source: In new construction, the required smoke alarms shall receive
their primary power from the building wiring when such wiring is served from a commercial
source, and when primary power is interrupted, shall receive power from a battery. Wiring shall
be permanent and without a disconnecting switch other than those required for overcurrent
protection. Section R313.2
g) Existing buildings power source: Smoke alarms shall be permitted to be battery operated when
installed in buildings without commercial power or in buildings that undergo alternations, repairs or
additions regulated by Section R313.1.1.
Garages and Carports:
24. Openings from a private garage directly into a room used for sleeping purposes shall not be permitted.
Section R309.1
25. Garage separation. The garage shall be separated from the residence and its attic area by not less than
1/2-inch gypsum board applied to the garage side. Garages beneath habitable rooms shall be
separated from all habitable rooms above by not less than 5/8 -inch Type X gypsum board or
equivalent. Where the separation is a floor - ceiling assembly, the structure supporting the separation
shall also be protected by not less than 1/2 inch gypsum board or equivalent. Section R309.2
Openings between the garage and residence shall be equipped with solid wood doors not less than 1 -3/8
inches in thickness, solid or honeycomb core steel doors not less than 1 -3/8 inches thick, or 20- minute
fire -rated doors. Section R309.1
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26. Garage and carport floors shall be of approved noncombustible materials. The area of floor used for
parking of automobiles or other vehicles shall be sloped to facilitate the movement of liquids to a drain
or toward the main vehicle entry doorway. Section R309.3
Protection from impact: appliances located in a garage or carport shall be protected from impact by
automobiles. Figure M1307.2 contains examples of acceptable types of protection. Section M1307.3.1
27. Elevation of ignition source. Appliances having an ignition source shall be elevated such that the
source of ignition is not less than 18 inches above the floor in garages. For the purpose of this section,
rooms or spaces that are not part of the living space of a dwelling unit and that communicate with a
private garage through openings shall be considered to be a part of the garage. Section M1307.3
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Footings and Foundations; Residential Concrete:
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28. Compressive Strength. Required minimum compressive strength of concrete in 28 days:
a) Basement walls, foundation walls and other concrete not exposed to the weather 2500 psi
b) Basement slabs and interior slabs on grade, except garage floor slab 2500
c) Basement, foundation, exterior walls, other vertical concrete exposed to the weather 3000
d) Porches, carport slabs and steps exposed to the weather and garage floor slabs 3000
Concrete shall be air entrained (5 % -7 %) for strengths of 3000 and 3500 psi, and when subject to
freezing and thawing during construction for 2500 psi concrete. See Table R402.2.
29. Footings shall be placed on undisturbed natural soil or engineered fill. See Section R403.1.
Minimum depth: Bottoms of exterior wall, bearing wall, pier and column footings shall be not less than
12 inches below finished grade. See Section R403.1.5
30. Minimum sizes: Concrete footings shall be 12" x 6" at 1 -story, 15" x 7" at 2 -story and 18" x 8" at 3-
story structures. For masonry footings or other footing conditions, see Table R403.1 and Figure
R403.1(1). See R403.1.1.
31. Slope. The top surfaces of footings shall be level. The bottom surface of footings may have a slope not
exceeding 1 in 10. Footings shall be stepped where the ground surface is more than 1 in 10. Section
R403.1.6.
32. Ground clearance: Wood siding, sheathing and wall framing on the exterior of a building shall have a
clearance of not less than 6 inches from the ground. See Section R319.1 Item 5
33. Seismic reinforcing: Foundation with stem walls shall be provided with a minimum of one No. 4
bar within 12 inches of the top of the wall and one No. 4 bar at the bottom of the footing. Where a
construction joint is created between a concrete footing and stem wall, a minimum of one No.4 bar shall
be provided at no more than 4 feet on center. The vertical bar shall extend 3 inches clear of the bottom
of the footing, having a standard hook and extend a minimum of 14 inches into the stem wall. See
Section R403.1.4 NOTE: Unless otherwise detailed on plan, a 6 inch 90 degree bend on the short leg
(hook) will be considered as meeting the intent of this section.
EXCEPTION: Foundations constructed monolithically shall be permitted to have a minimum of
two No.4 bars placed in the footing. Section R403.1.4
34. Wood sill plate anchor bolts shall be minimum 1/2 -inch diameter, 7 inches embedment, max. 6 feet on
center and not more than 12 inches from a corner or mudsill splices or less than 7 bolt diameters from
mudsill splice. Minimum 2 anchor bolts per plate, See Section R403.1.8 and R403.1.8.1
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35. Concrete slab on ground floors shall be not less than 3 1/2 inches thick. Where slabs and footings are
constructed monolithically, footings shall comply with requirements in Figure R403.1.1 (1).
36. Concrete foundation walls. Concrete- foundation walls shall be constructed as set forth in Section
R404 and Tables R404.1.1(1), R404.1.1(2), R404.1.1(3) and R404.1.1(4). In Seismic Design Categories D1
and D2, concrete foundation walls shall comply with Section R404.1.4. The foundation wall shall not be
less than the wood frame wall supported.
Crawl spaces:
37. Access opening. Crawl spaces shall be provided with a minimum 18 inches by 24 inches access
opening. Openings through a perimeter wall shall be not less than 16 inches by 24 inches. Pipes, ducts
and other construction must not obstruct accessibility to and within the crawl space. See Section
R408.3. See Section M1305.1.4 for access requirements where mechanical equipment is located under
floor.
38. Crawlspace ventilation: Crawl spaces shall be ventilated through openings to the outside. The
minimum net area of openings shall be 1/1500 of the crawl space area with a vapor barrier / ground
cover installed as required by Section N1104.9.2. One ventilating opening shall be required within 3 feet
of each corner of the building. The openings shall be covered with corrosion resistant wire mesh or
equivalent with 1/8-inch minimum dimension. Ventilation openings may be omitted on one side of a
building. Ventilation openings may be omitted when continuously operated mechanical ventilation is
provided at a rate of 1.0 cfm for each 50 square feet of crawl space floor area and an approved ground
cover is provided. Supply air shall be provided from outside of the conditioned space and the building.
An exhaust opening equal in size to the supply opening shall be provided. Vertical duets extending to
the outdoors shall be turned down or fitted with a rain cap. See Sections R408.1 and R408.2.
39. Drainage: Provide water drainage from the crawl space by means of crawl space and foundation drains
sloped for gravity drainage and extending to a storm sewer, street gutter, road ditch or other drainage
way or raise the finish grade in the crawl space to the level of finish grade outside. See Section R408.5.
40. Removal of debris: The under -floor grade shall be cleaned of all vegetation and organic material. All
wood forms used for placing concrete shall be removed before the building is occupied or used for any
purpose. All construction materials shall be removed before a building is occupied or used for any
purpose. Section R408.4
Surface and Groundwater Control, Damp Proofing:
41. Surface drainage shall be diverted to a storm sewer conveyance or other approved point of collection so
as not to create a hazard. Lots shall be graded so as to drain surface water away from the foundation
walls. The slope from foundation walls shall fall at least 6 inches in the first 10 feet or at least 6 inches
where the horizontal distance is restricted by property line. Section R401.3
42. Where lot lines, walls, slopes or other physical barriers prohibit 6 inches of fall within 10 feet, drains,
swales or other approved means shall be provided to ensure drainage away from the structure. Section
R401.3 — Exception
43. Waterproofing and Damp proofing: Exterior foundation walls that retain earth and enclose habitable
or usable space below grade shall be dampproofed or waterproofed with approved materials from the
footing to the finished grade. Sections R406.1 and R406.2
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Protection against Decay:
44. Locations requiring pressure treated wood: (there shall be a quality mark of an approved inspection
agency on each piece of treated material - See Section R319)
1. Wood joists or bottom of wood structural floor when closer than 18 inches or wood girders when
closer than 12 inches to exposed ground in crawl spaces or unexcavated area located within the
periphery of the building foundation
2. All wood framing members that rest on concrete or masonry exterior foundation walls and are less
than 8 inches from the exposed ground.
3. Sills and sleepers on a concrete or masonry slab that is in direct contact with the ground unless
separated from such slab by an impervious moisture barrier.
4. The ends of wood girders entering exterior masonry or concrete walls having clearances of less than
05 inches on tops side and ends.
5. Wood siding, sheathing and wall framing on the exterior of a building having a clearance of less than
6 inches from the ground.
6. Wood structural members supporting moisture permeable floors or roofs that are exposed to the
weather, such as concrete or masonry slabs, unless separated from such floors or roofs by an
impervious moisture barrier
7. Wood furring strips or other wood framing members attached directly to the interior of exterior
masonry walls or concrete walls below grade except where an approved vapor retarder is applied
between the wall and the furring strips or framing members.
a) Posts, poles and columns: Posts, poles and columns supporting permanent structures that are
embedded in concrete exposed to the weather shall be approved preservative pressure treated wood
suitable for ground contact use. Section R319.1.3
b) Wood columns: Wood columns shall be approved wood of natural decay resistance or approved
preservative pressure treated wood. Section R319.1.4
EXCEPTIONS:
1. Posts or columns which are either exposed to the weather or located in basements or cellars,
supported by piers or metal pedestals projecting 1 inch above the floor or finished grade and 6
inches above exposed earth, and are separated there from by an approved impervious
moisture barrier.
2. Posts or columns in enclosed crawl spaces or unexcavated areas located within the periphery
of the building, supported by a concrete pier or metal pedestal at a height greater than 8
inches from exposed ground, and are separated there from by an impervious moisture
barrier.
45. Fastenings: all fasteners, hangers, or other metal material for use with pressure preservative and fire -
retardant treated wood shall be hot dipped galvanized steel, stainless steel, silicon bronze or copper.
Framing:
46. Grading and Fasteners: Load bearing dimension lumber (including logs used in log home construction)
shall be identified by a grade mark Refer to Tables R602.3(1) & R602.3(2) for fastener (nails, staples,
etc.) requirements. See Sections R502 and R602.
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47. Floor framing shall be constructed in accordance with Chapter 5, Figure R502.2 and nailed in accordance
with Tables R602.3(1) and R602.3(2).
48. Bearing: Joists and beams must have not less than I 1/2 inches of bearing on wood or metal or 3 inches
on concrete or masonry. Floor joists shall have solid blocking at each support and at the ends, except
where ends are nailed to a rim joist or to adjoining studs. Joists framing from opposite sides on a beam
or wall shall be lapped 3 inches or tied together. Framing anchors or ledgers minimum. 2 inches x 2
inches shall support joists framing into the side of a beam.
49. Joists under bearing partitions shall be of adequate size to support the load. Double joists, sized to
adequately support the load, which are separated for the installation of piping or vents shall have full
depth solid wood blocking not less than 2 inches in nominal thickness and spaced not more than 4 feet
on center. Bearing partitions perpendicular to joists shall not be offset from supporting girders, walls or
partitions more than the joist depth unless such joists are of sufficient size to carry the additional load.
Section R502.4.
50. Bridging: Joist exceeding a nominal 2 inches by 12 inches shall be supported laterally by solid blocking,
diagonal bridging (wood or metal), or a continuous I- inch -by 3 -inch strip nailed across the bottom of
joists perpendicular to joists at intervals not exceeding 8 feet. Section R502.7. 1
51. Gussets plates: Where posts and beam or girder construction is used, plywood gussets or minimum 16
gauge steel connectors shall be provided at all post -to -beam connections. Lateral bracing is required at
the bottom end of posts exceeding 4 -0" in length. Section R502.9
52. Wood floor and roof trusses shall be of approved design and shall be installed and braced in accordance
with the design. Trusses shall not be notched drilled cut or altered unless so provided in the design. See
Sections R502.11 and R802.10.
53. Foundation cripple walls shall be framed of studs not less in size than the studding above. When
exceeding 4 feet in height, such walls shall be framed of studs having the size required for an additional
story. Cripple walls supporting three stories shall be framed with 2 -inch by 6 -inch studs spaced not more
than 16 inches on center. Section R602.9
Cripple walls with a stud height less than 14 inches supporting exterior walls or an interior braced wall
line which is supported by a continuous foundation as required by Section 602.10.99 shall be sheathed
on at least one side with wood structural panel that is fastened to both the top and bottom plates in
accordance with Table R602.3(1), or these cripple walls shall be constructed of solid blocking. Section
R602.9
54. Wall bracing. Walls shall be braced in accordance with Section R602.10. For building in Seismic Design
Categories Dl and D2, walls shall be constructed in accordance with the additional requirements of
Sections R602.10.9, R602.10.11 and R602.11.
55. Stud grade. Studs shall be a minimum No. 3, Standard or Stud grade lumber. EXCEPTION: Bearing
studs not supporting floors and nonbearing studs may be Utility grade lumber, provided the studs are
spaced in accordance with Table R602.3(5). Section R602.2
56. Fireblocking shall be provided to cut off all concealed draft openings (both vertical and horizontal) and
to form an effective fire barrier between stories, and between atop story and the roof space. Wood
fireblocking shall be 2 inches nominal thickness, 23/32" wood structural panels or 3/4 inch Type 2 -M-
W particleboard with joints backed with same material. Firestops may be 1/2" gypsum board, cement -
based millboard or other noncombustible material securely fastened in place. Where unfaced fiberglass
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is used as fireblocking, it must fill the entire cross section of the wall cavity to a minimum height of 16 ".
See Sections 602.8, 602.8.1 and 602.8.1.1.
Fireblocking shall be provided in wood -frame construction in the following locations:
1. In concealed spaces of stud walls and partitions, including furred spaces, at the ceiling and floor level
and at 10 foot intervals both vertical and horizontal. Batts or blankets of mineral wool or glass fiber
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or other approved nonrigid materials shall be allowed as fireblocking in walls constructed using
parallel rows of studs or staggered studs.
2. At all interconnections between concealed vertical and horizontal spaces such as occur at soffits, drop
ceilings, cove ceilings.
3. In concealed spaced between stair stringers at the top and bottom of the run. Enclosed spaced under
stairs shall comply with Section R311.2.2.
4. At openings around vents, pipes, and ducts at ceiling and floor level, with an approved material to
resist the free passage of flame and products of combustion.
5. For the fireblocking of chimneys and fireplaces, see Section R1001.16.
6. Fireblocking of cornices of a two - family dwelling is required at the line of dwelling unit separation,
57. Draft stopping required: When there is usable space both above and below the concealed space of a
floor /ceiling assembly. Draft stops shall be installed, so that the area of the concealed space does not
exceed 1,000 square feet. Draftstopping shall divide the concealed space into approximately equal areas.
Where the assembly is enclosed by a floor membrane above and a ceiling membrane below
draftstopping shall be provided in floor /ceiling assemblies under the following circumstances: Section
R502.12.
1. Ceiling is suspended under the floor framing.
2. Floor framing is constructed of truss -type open -web or perforated members.
58. Draftstopping materials shall be 1/2 -inch gypsum board, 3/8 -inch wood structural panels, and 3/8"
Type 2 -M -W particleboard or other approved material adequately supported. Draftstops shall be
installed parallel to the floor framing members Sections R502.12.1
Wall and Ceiling Covering:
59. Gypsum wallboard shall be installed in accordance with Table R702.3.5. See Section R702.3.
60. Flame spread: Wall and ceiling finishes shall have a flame spread classification of not greater than 200
and a smoke - developed index of not greater than 450, See Section R315 and Section R315.1
Exceptions.
61. Exterior sheathing shall be applied before applying exterior cover. Section R701.2
62. Asphalt saturated felt weighing not less than 14 lbs /100 sq. ft. or equivalent weather - resistive barrier
shall be used under exterior siding, unless siding is applied over water repellent sheathing or consists of
approved weatherproof panels. T -111 plywood panels are approved weatherproof panels. They must
be nailed with a line of nails in each panel edge when used in single wall construction. See Section
R703.2
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63. Siding: Weather resistant siding shall be installed per Table R703.4.
64. Flashing: approved corrosion - resistive flashing shall be provided at tops and sides of all exterior
window and door openings except at self - flashing windows having a continuous lap of not less than 1
1/8 inch over the sheathing material around the perimeter of the opening, including corners. Flashing
shall be installed at the intersection of chimneys or other masonry construction with frame or stucco
walls; under and at the ends of masonry, wood or metal copings and sills; continuously above all
projecting wood trim and at wall and roof intersections. See Section R703.8.
Roof / Ceiling Construction and Attic Spaces:
65. Grade mark: Load bearing dimensional lumber shall be identified by a grade mark. See Section R802.1
66. Drainage control: Where required by the building official, all dwellings shall have a controlled method
of water deposal from roofs that will collect and discharge all roof drainage in accordance with Chapter
32 of this code. See Sections R801.3 & R801.4.
67. Rafters shall be nailed to ceiling joists to form a continuous tie between exterior walls where joists are
parallel to the rafters. Where not parallel, rafters shall be tied with a rafter tie, located as near the plate as
practical. Rafter ties shall be spaced not more than 4 feet on center. Ridge boards shall be at least 1 -inch
nominal thickness and not less in depth than the cut ends of the rafters. At all valleys and hips there shall
be a valley or hip rafter not less than 2 -inch nominal thickness and not less in depth than the cut end of
the rafter. See Section R802.3.
68. Ends of ceiling joists shall be lapped a minimum of 3 inches or butted over bearing partitions or beams
and toenail to the bearing members. Where ceiling joists are used to resist rafter thrust, lapped joists
shall be nailed together and butted joists shall be tied together in such a manner as to resist such thrust.
Section R802.3.2
69. When the roof pitch is less than 3 in 12, members supporting rafters and ceiling joists shall be designed
as beams. Section R802.3
70. Bearing: The ends of each rafter or ceiling joist shall have not less than 1 1/2 inches of bearing on
wood or metal and not less than 3 inches on masonry. Section R802.6. Rafters and ceiling joists having a
depth -to- thickness ratio greater than 5 to I shall be laterally supported at bearing points to prevent
rotation. Section R802.8
71. Lumber sheathing: Allowable spans for lumber used as roof sheathing shall conform to Table R803.1.
Spaced lumber sheathing for wood shingles and shake roofing shall conform to the requirements of
Section R905.7 and R905.8. Spaced lumber sheathing is not allowed in Seismic Design Category D2.
Section R803.1
72. Attic access: attics with a clear height of 30 inches or more must be provided with an access. The rough
framed access opening shall be not less than 22 inches by 30 inches. Section R807.1.
73. Roof ventilation: Cross ventilation shall be provided in enclosed attics and rafter spaces where ceiling is
applied to the underside of rafters. The opening area shall be not less than 1 /150 of the space ventilated.
The area may be reduced to 1/300 if at least 50 percent but not more than 80 percent of the openings
are in the upper part of the ventilated space and at least 3 feet above the eave or cornice vents or when a
vapor barrier not exceeding I perm transmission rate is installed on the warm side of the ceiling.
Ventilating openings shall be provided with corrosion - resistant wire mesh, with 1/8 inch minimum to
1/4 inch maximum openings. See Section R806
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Roof Coverings:
74. Fasteners for roof covering shall be in accordance with Chapter 9 of the Oregon Residential Specialty
Code, based on type of material used. In all, cases, fasteners shall be long enough to penetrate into roof
sheathing 3/4 inches or through the thickness of sheathing, whichever is less.
75. Flashing shall be installed at junctions of chimneys and roofs, in roof valleys and around all roof
openings. See Chapter 9 of the Oregon Residential Specialty Code for specific requirements.
76. Roofing shall be installed according to manufacturer's printed instructions and this code. See Section
R902. (A copy of code requirements for the kind of roofing material used shall be available on request.)
Chimneys and Fireplaces:
- 77. Reinforcement in Seismic Design Categories DI and D2 : masonry and concrete chimneys and
fireplaces shall be reinforced and anchored as detailed in Section R1003 and illustrated in Figure R1003.1
and Table RI003.1.
78. Foundation: Masonry fireplaces and their chimneys shall be supported on foundations of solid masonry
or concrete at least 12 inches thick and at least 6 inches beyond each side of the exterior dimensions of
the chimney. Bottom of footing must be at 12 inches below the finished grade. See Section RI003.2.
79. Termination: Chimneys shall extend at least 2 feet higher than any portion of the building within 10
feet, but shall not be less than 3 feet above the point where the chimney passes through the roof.
Section R1001.6
80. Wall thickness: Masonry chimney walls shall be constructed of solid masonry units or hollow masonry
units grouted solid of not less than 4 inches nominal thickness. Section R1001 .7
81. Flue lining: Chimneys shall be lined with approved fire clay flue liners or with other approved liners of
material that will resist, without cracking or softening, a temperature of! 800 degrees F. Chimneys may
also be lined with listed chimney lining systems complying with UL 1777 or factory built chimneys or
chimney units listed for installation with masonry chimneys. See Section R1001.8.
Flue liners shall extend from a point not less than 8 inches below the lowest inlet or, in the case of
fireplaces, from the top of the smoke chamber, to a point above the enclosing walls. Refer to Section
RI001.9.
82. Clearance to combustibles of masonry chimneys shall be 2 inches for interior chimneys and 1 inch for
chimneys on the exterior of the building. See Section RI001.15.
83. Fireplace clearances: All wood beams, joists, studs and other combustible materials shall have a
clearance of not less than 2 inches from the front faces and sides of the masonry fireplace and not less
than 4 inches from the back faces of masonry fireplaces. The air space shall not be filled, except to
provide fire blocking in accordance with Section RI003.13. See Section RI003.11.
84. Inlets to masonry chimneys shall enter from the side. Inlets shall have a thimble of fireclay, rigid
refractory material or metal that will prevent the connector from pulling out of the inlet or from
extending beyond the wall of the liner. Section R1001.13 -
85. Chimney crickets: Chimney shall be provided with crickets when the dimension parallel to the
ridgeline is greater than 30 inches and does not intersect the ridgeline. The intersection of the cricket
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and the chimney shall be flashed and counter flashed in the same manner as normal roof - chimney
intersections. See Section R1001.17.
86. Masonry fireplaces shall be constructed of solid masonry units, stone, or reinforced concrete in
accordance with Figure R1003.1. Where a lining of firebrick at least 2 inches in thickness or other
approved lining is provided the total thickness of back and sides, including the lining, shall be not less
than 8 inches. Where no lining is provided, the thickness of back and sides shall be 10 inches of solid
masonry. See Section R1003.5.
87. Steel fireplace units incorporating a firebox liner of not less than 1/4 inch in thickness and an air
chamber may be installed with masonry to provide a total thickness at the back and sides of not less
than 8 inches, of which not less than 4 inches shall be of solid masonry. Warm -air ducts employed with
steel fireplace units of the circulating air type shall be constructed of metal or masonry. See Section
R1003.5.1.
88. Lintel and throat: Masonry over a fireplace opening shall be supported by a lintel of noncombustible
material. The minimum required bearing length on each end of the fireplace opening shall be 4 inches.
The fireplace throat or damper shall be located a minimum of 8 inches above the lintel. Section R1003.7
89. Mantel and trim: Woodwork or other combustible materials shall not be placed within 6 inches of
fireplace opening. Combustible material within 12 inches of the fireplace opening shall not project more
than 1/8 inch for each 1 -inch distance from such opening. See Section R1003.12.
90. Hearths shall be not less than 4 inches in thickness. Hearth extensions shall be of masonry or concrete
at least 2 inches thick and supported by noncombustible materials and reinforced to carry its own
weight and all imposed loads. When the bottom of the firebox opening is raised to at least 8 inches
above the top of the hearth extension, a hearth extension of not less than 3/8 inch brick, concrete,
stone, tile or other approved noncombustible material may be used. Section R1003.9.
91. Hearth extensions shall extend at least 16 inches in front of, and at least 8 inches beyond, each side of
the fireplace opening. Where the fireplace opening is 6 square feet or larger, the hearth extension shall
extend at least 20 inches in front of, and at least 12 inches beyond, each side of the fireplace opening.
Section R1003.10.
92. Factory built fireplaces shall be listed and labeled and shall be installed in accordance with the conditions
of the listing. Factory-built fireplaces shall be tested in accordance with UL 127. See Section R1004 for
additional information.
93. Fireplace stoves shall be listed, labeled and installed in accordance with the terms of the listing. Fireplace •
stoves shall be tested in accordance with UL 737. Section M1414.1
94. Exterior air: factory-built or masonry fireplaces covered in Chapter 10 shall be equipped with an
exterior air supply to ensure proper fuel combustion unless the room is mechanically ventilated and
controlled so that indoor pressure is neutral or positive. See Section R1005.1. •
95. Factory-built fireplaces: exterior combustion air ducts for factory-built fireplaces shall be a listed
component of the fireplace and shall be installed in accordance with the fireplace manufacturer's
instructions. See Section R1005.1.1.
96. Exterior air intake shall be capable of providing all combustion air from the exterior of the dwelling or
from spaces within the dwelling ventilated with outside air such as mechanically ventilated crawl or attic
spaces. The exterior air intake shall not be located within the garage or basement of the dwelling nor
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shall the air intake be located at an elevation higher than the firebox. The exterior sir intake shall be
covered with a corrosion- resistant screen of 1/4-inch mesh. Section R1005.2
Energy Efficiency:
97. Information required on plans and specifications. Plans and specification shall show in sufficient
detail all pertinent data and features of the building and the equipment and systems, including, but not
limited to: the exterior envelop component materials; R- values of insulation materials; HVAC
equipment and controls and other pertinent data to indicate conformance with the requirements of
Chapter 11.
98. The provision of Chapter 11 regulate the exterior envelope; the design, construction and selection of
heating, ventilating and air conditioning systems, and piping insulation, required for the of effective
conservation of energy within a building or structure governed. Refer to Section N1101.1.
Additionally, all conditioned spaces within dwellings shall comply with Table N1104.1(1), for
. prescriptive compliance and Table N1104.1(2) in conjunction with Table NT104.1(3), for performance
calculations.
99. Table N1104.1(1)
PRESCRIPTIVE COMPLIANCE PATHS FOR RESIDENTIAL BUILDINGS
BUILDING . PATH 1 PATH 2 PATH 3 PATH 4 PATH 5 PATH 6 PATH 7 PATH 8 PATH 9 PATH 10
COMPONENTS
Sun Sun Sun Sun House Log
Temper temper tempered temper size homes
(d) (d) (d) (d) limited solid -
(e) timber
Maximum allowable No limit No limit No limit No limit No limit No limit No limit 12% No limit No limit
window area (f)
Window class (g) U =0.40 U =0.40 U =0.50 U =0.50 U =0.60 U =0.60 U =0.60 U =0.40 U =0.40 U =0.35
Exterior doors U =0.20 U =0.20 U =0.20 U =020 U =020 U =0.20 U =020 U =0.20 U =0.54 U =0.20
Os) (h) (h) (h)
Wall insulation (i) R -21 R -15 R -21A R -15A R -24A R -21A R -21A R -I5 (c) R -15
(k) (k) (k) (k) (k)
Under-floor insulation R -25 R -21 R -25 R -21 R -30 R -21 R -25 R -21 R -30 R -30
Flat ceilings R -38 R -49 R -49A R -38 R-49A R49A R -49A R-49 R -49 R -49
(k) (k) (k) (k)
Vaulted ceilings (1) R -30 R -30 R -30 R -38 R38 R -38 R -38 R -38 R -38 R -38
(m) (m) (m)
Skylight dass (g) U =0.50 U =0.50 U =0.50 U =0.50 U =0.50 U =0.50 U =0.50 U =0.50 U =0.50 U =0.50
Skylight area (n) <2% <2% <2% <2% <2 °c <2% <2% <2% <2% <2%
Below -grade wood, R -15 R -15 R -15 R -15 R -15 R -15 R -15 R -15 R -15 R -15
Concrete or Masonry
walls (o)
Slab floor edge R -15 R -15 R -15 R -15 R -15 R -15 R -15 R -15 R -15 R -15
insulation
Forced air duct R -8 R -8 R -8 R -8 R -8 R -8 R -8 R -8 R -8 R-8
insulation
a. Path I is based on cost effectiveness. Paths 2 -7 are based on energy equivalence with Path 1. Cost effectiveness of Paths 2 -9 not evaluated.
b. As allowed in current Section N1104.1, thermal performance of a component may be adjusted provided that overall heat loss does not exceed the total
resulting from conformance to the required U- factor standards. Calculations to document equivalent heat loss shall be performed using the procedure and
approved U- factor contained in Table N1104.1(2).
c. R- values used in this table are nominal, for the insulation only and not for the entire assembly, the wall component for Path 9 shall be a minimum solid log
or timber wall thickness of 3.5 inches.
d. The sun- tempered house shall have one lot line which borders on a street within 30 degrees of true east -west and 50 percent or more of the total glazing,for
the heated space on the south elevation. An approved alternate to street orientation based on solar design and access shall be accepted by the building
official.
e. Path 8 applies only to residential buildings with less than 1,500 square foot heated floor space and glazing area less than 12 percent of heated floor area
f. Reduced window area may not be used as a trade - off criterion for thermal performance of any component, except as noted in Table N1104.1(2).
g. Window and skylight U- factors shall not exceed the number listed. Note that CL40 is the same as U =0.40.
h. A maximum of 28 square feet of exterior door area per dwelling unit can have a U- factor of 0.54 or less.
i. Wall insulation requirements apply to all exterior wood framed, concrete or masonry walls that are above grade. This includes cripple walls and rim joist
areas.
j. R -19 Advanced Frame or 2x4 wall with rigid insulation may be substituted if total nominal insulation R -value is 18.5 or better.
lc A = advanced frame construction as defined in Section N1104.5.1 for walls, and Section N1104.6 for ceilings.
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I. Insulation levels for ceilings that have limited attic /rafter depth such as dormers, bay windows or similar architectural features totaling not more than 150
square feet in area may be reduced to not than R -21. When reduced, the cavity shall be filled (except for required ventilation spaces), and a 0.5 perm (dry
cup) vapor retarder installed.
m. Vaulted area, unless insulated to R -38, may not exceed 50 percent of the total heated space floor area.
n. The skylight area is a percentage of the heated space floor area. Any glazing in the roof /ceiling assembly above the conditioned space shall be considered a
skylight.
o. Below -grade wood, concrete or masonry walls includes all walls that are below grade and does not include those portions of such wall that extend more
than 24 inches above grade.
Insulation (General)
100. Insulation R- values must match those indicated in the prescriptive path chosen at the time of submittal.
Insulation R- values, locations etc., will be verified in the field. No deviation from the selected path will
be allowed without complete thermal performance calculations.
101. Loose -fill insulation. Blown, poured and spray -on type insulation complying with Section R316 may
be used in attic spaces where roof slope is 4 units vertical in 12 units horizontal (33.3.percent slope) or
greater and there is at least 44 inches of headroom at the roof ridge. (Clear headroom is defined as the
distance from the top of the bottom chord of the truss or ceiling Joists to the underside of the roof
sheathing). Adequate baffling of the vent opening shall be provided so as to deflect the incoming air
above the surface of the blown or poured insulation. Baffles shall be of weather - resistant, rigid material
capable of retaining the insulation, and shall be in place at the time of framing inspection. Section
N1104.2.1
102. Batt -type insulation shall be installed flush against the warm side of the cavity insofar as practicable.
Section N1104.2.2
103. Recessed light fixtures are not permitted in any insulated cavity unless the fixtures are labeled as being
suitable for direct contact with insulation (i.e. IC rated). Section NI 104.2.4
104. Recessed lighting fixtures. Recessed light fixtures installed within the building envelop shall meet one of
the following requirements. Section NI104.2.6
1.Type IC rated, manufacture with no penetrations between the inside of the recessed fixture and
ceiling cavity, and the annular apace between the ceiling cutout and lighting fixture shall be sealed.
2. Type IC rated in accordance with ASTM E283 with not more than 2.0 cubic feet per minute air
movement from the conditioned space to the ceiling cavity at 1.57 psi pressure difference and shall
be labeled, and the annular space between the ceiling cutout and lighting fixture shall be sealed.
3. Type IC rated installed inside a sealed box constructed from a minimum 0.5.inch -thick gypsum
wallboard or constructed from a preformed polymeric vapor barrier, or other air -tight assembly
manufactured for this purpose.
105. Thermal Insulation must not be installed within 3 inches of any metal chimney or gas vent that is not
listed for insulation clearances. Thermal insulation shall not be installed in a manner that would
obstruct openings required for attic ventilation. A permanent sleeve of fine wire mesh screen, sheet
metal or other noncombustible material shall be installed to maintain the required clearances. See
Section NI104.2.4
106. Flame spread. All exposed insulation materials must have a flame - spread rating of not more than 25
and a smoke developed rating of not more than 450 except for insulation facing in contact with
unexposed ceiling, floor & wall surfaces. See Section R316
107. Foam plastic insulation shall be as specified in Section R3I4.
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Windows and Doors (General)
108. Exterior doors: Doors shall be tested according to the requirements of Section N1104.4. When
calculating the energy performance of the exterior envelop, the area of doors shall be the actual unit
size. Section N1104.3
EXCEPTIONS:
1. Unglazed doors that are not tested according to the requirements of Section N1104.4 shall be
assigned a default U -value of 0.54.
2. Sliding glass doors and swinging glass doors shall meet the specification for glazing and shall be
treated as such.
3. Doors that incorporate glazed areas more than 2.5 square feet in area shall be considered windows.
109. Doors shall meet the air leakage requirements of Section N1104.8.
110. Single glazed windows may be used for decorative purposes or as a unique architectural feature
provided the area of single glazing is equal to or less than 1% of the heated floor area. See N1104.4
(Exception)
113. Thermal performance labeling. Windows must meet the U -value or "class" requirement for the path
chosen and must be labeled accordingly. See Section N1104.4.1
114. Air leakage requirement: All windows and doors must meet the air leakage requirements of Section
N1104.8
115. Seal required: Exterior joints around window and doorframes, between wall cavities and windows or
door frames, between wall and foundation, between wall and roof, between wall panels, at penetrations
of utility services through walls, floors and roofs and all other openings in the exterior envelope shall
be sealed in a manner approved by the building official. Section R1104.8.2
Moisture Control (Vapor Barriers)
116. Vapor barriers are required on the warm (in winter) side of insulation. Ref. Section N1104.9.1
117. Exterior walls shall have a vapor barrier of 1.0 perm dry cup rating or less. Ref. Section N1104 9 1
118. Roof /ceiling assemblies shall have a vapor barrier of 0.5 perm or less in exterior ceilings without attic
apace above. The vapor barrier need not be an integral part of the insulation. In ceilings, flanges shall
be lapped over framing members. Ref. Section N1104.9.1
119. Floors shall have a vapor barrier of 1.0 perm or less, Ref, Section N1104.9.1
120. Ground cover. Crawl spaces must have aground cover (vapor barrier) of 6 mil. black polyethylene or
other approved material of equivalent perm rating and durability. Ground cover must be lapped 12" at
joints, blanket the entire crawl space area and turn 12" minimum up the foundation walls, Ref. Section
N1104.9.2
122. Concrete slabs in heated spaces must have a ground cover of 6 -mil polyethylene or approved equal on
the ground beneath floor slabs located in conditioned spaces. Slabs in heated spaces must be insulated
per the prescriptive path chosen.
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4
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General Mechanical System Requirements
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123. All appliances shall be listed and bear the label of an approval agency unless otherwise approved in
accordance with Section R104.11 Section MI302.1
124. Appliances shall be accessible for inspection, service, repair and replacement without removing
permanent construction. Thirty inches of working space shall be provided in front of the control side
to service an appliance. Section M1305.1
125. Central furnaces or appliances located in compartments, alcoves or similar spaces shall conform to
Sections M1305.1.1 and M1305.1.2.
126. Appliances in attics. Attics containing appliances requiring access shall be provided with an opening
and a clear and unobstructed passageway large enough to allow removal of the largest appliance, but
not less than 30" high and 22" wide and not more than 20 feet in length when measured along the
centerline of the passageway from the opening to the appliance.. The passageway shall have continuous
solid flooring not less than 24" wide. A level service space at least 30" deep and 30" wide shall be
present along all sides of the appliance where access is required. The clear access opening dimensions
shall be a minimum of 20 inches by 30 inches where such dimensions are large enough to allow
removal of the largest appliance. Refer to Section M1305.1.3. Additionally, attic insulation shall be
maintained continuous under the appliances.
EXCEPTIONS:
1. The passageway and level service space are not required where the appliance is capable of being
serviced while standing on a portable ladder extending through the required opening.
2. In existing structures the access opening shall be large enough for removal and replacement of
the largest piece of the equipment.
127. Clearances from combustible construction shall be in accordance with Section M1306.
128. Mechanical system piping support requirements are to be in accordance with Section M1309 and Table
1309.1.
129. Heating and cooling equipment shall be installed in accordance with the manufacturer's installation
instructions and the requirements of Chapters 13 -24. The equipment shall be sized based on building
loads calculated in accordance with ACCA Manual J or other approved heating and cooling
calculation methodologies. Section M1401.3
130. Range hoods and down draft exhaust systems shall comply with the requirements of Section M1502
131. Building cavities used for return air duct or plenums shall conform to Section M1601.1.1.1.
132 Combustion air: Liquid and solid fuel- burning appliances shall be provided with a supply of air for
fuel combustion, draft hood dilution and ventilation of the space in which the appliance is installed.
See Section M1701
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