Building:
| |
1. One-story detached accessory structures used as tool and
storage sheds, playhouses and similar uses, provided the floor area
does not exceed one hundred twenty (120) square feet (11.15 m2) or
two hundred (200) square feet (19 m2) for portable structures.
| |
2. Fences not over seven (7) feet high.
| |
3. Retaining walls that are not over four (4) feet (1,219 mm)
in height measured from the adjacent grade unless supporting a surcharge.
| |
4. Water tanks supported directly upon grade if the capacity
does not exceed five thousand (5,000) gallons (18,927 L) and the ratio
of height to diameter or width does not exceed two (2) to one (1).
| |
5. Sidewalks and driveways.
| |
6. Painting, papering, tiling, carpeting, cabinets, countertops
and similar finish work.
| |
7. Prefabricated swimming pools that are less than twenty-four
(24) inches (610 mm) deep.
| |
8. Swings and other playground equipment.
| |
9. Window awnings, supported by an exterior wall, that do not
project more than fifty-four (54) inches (1,372 mm) from the exterior
wall and do not require additional support.
| |
10. Decks not exceeding two hundred (200) square feet (11.15
m2) in area, that are not more than thirty (30) inches (762 mm) above
grade at any point, are not attached to a dwelling, do not serve the
exit door required by Section R311.4.
| |
11. Flagpoles forty (40) feet or less in height.
| |
12. Replacement of doors and windows where the opening size
is not increased or decreased.
| |
Electrical:
| |
1. Listed cord-and-plug-connected temporary decorative lighting.
| |
2. Reinstallation of attachment plug receptacles but not the
outlets therefor.
| |
3. Replacement of branch circuit overcurrent devices of the
required capacity in the same location.
| |
4. Electrical wiring, devices, appliances, apparatus or equipment
operating at less than twenty-five (25) volts and not capable of supplying
more than fifty (50) watts of energy.
| |
5. Minor repair work, including the replacement of lamps or
the connection of approved portable electrical equipment to approved
permanently installed receptacles.
| |
Gas:
| |
1. Portable heating, cooking or clothes-drying appliances.
| |
2. Replacement of any minor part that does not alter approval
of equipment or make such equipment unsafe.
| |
3. Portable-fuel-cell appliances that are not connected to a
fixed piping system and are not interconnected to a power grid.
| |
Mechanical:
| |
1. Portable heating appliances.
| |
2. Portable ventilation appliances.
| |
3. Portable cooling units.
| |
4. Steam, hot- or chilled-water piping within any heating or
cooling equipment regulated by this code.
| |
5. Replacement of any minor part that does not alter approval
of equipment or make such equipment unsafe.
| |
6. Portable evaporative coolers.
| |
7. Self-contained refrigeration systems containing ten (10)
pounds (4.54 kg) or less of refrigerant or that are actuated by motors
of one (1) horsepower (746 kW) or less.
| |
8. Portable-fuel-cell appliances that are not connected to a
fixed piping system and are not interconnected to a power grid.
| |
Plumbing:
| |
1. The stopping of leaks in drains, water, soil, waste or vent
pipe; provided, however, that if any concealed trap, drainpipe, water,
soil, waste or vent pipe becomes defective and it becomes necessary
to remove and replace the same with new material, such work shall
be considered as new work, and a permit shall be obtained and inspection
made as provided in this code.
| |
2. The clearing of stoppages or the repairing of leaks in pipes,
valves or fixtures, and the removal and reinstallation of water closets,
provided such repairs do not involve or require the replacement or
rearrangement of valves, pipes or fixtures.
| |
3. Fixture replacement with similar fixtures, including water
heaters, where plumbing connections are not relocated.
|
Ground Snow Load
|
20 PSF
| |
Wind design
|
Speed (mph)
|
115 mph
|
Topographic effects
|
No
| |
Special wind region
|
No
| |
Wind-borne debris zone
|
No
| |
Seismic design category
|
SDC C
| |
Subject to damage from
|
Weathering
|
Severe
|
Frost line depth
|
30 inches
| |
Termite
|
Moderate to heavy
| |
Winter design temp
|
6° F.
| |
Ice barrier underlayment required
|
No
| |
Flood hazards
|
(See Floodplain Administrator)
| |
Air freezing index
|
963
| |
Mean annual temp
|
55° F.
|
For SI: 1 pound per square foot = 0.0479 kPa, 1 mile per hour
= 0.447 m/s.
|
Exceptions:
| |
1. Walls, projections, openings or penetrations in walls perpendicular
to the line used to determine the fire separation distance.
| |
2. Walls of dwellings and accessory structures located on the
same lot.
| |
3. Detached tool sheds and storage sheds, playhouses and similar
structures exempted from permits are not required to provide wall
protection based on location on the lot. Projections beyond the exterior
wall shall not extend over the lot line.
| |
4. Detached garages accessory to a dwelling located within five
(5) feet of a lot line are permitted to have roof eave projections
not exceeding four (4) inches (102 mm).
| |
5. Foundation vents installed in compliance with this code are
permitted.
| |
6. Cantilevered manufactured fireplaces meeting the requirements of Chapter 405 of the Municipal Code and protected with 5/8 Type X gypsum.
|
Exceptions:
| |
1. Storm shelters and basements used only to house mechanical
equipment not exceeding a total floor area of two hundred (200) square
feet (18.58 m2).
| |
2. Emergency escape and rescue openings are not required in
basements (other than sleeping rooms), provided the basement was built
prior to January 1, 2016.
|
Exceptions:
| |
1. Exterior balconies less than sixty (60) square feet (5.6
m2) and only accessible from a door are permitted to have a landing
less than thirty-six (36) inches (914 mm) measured in the direction
of travel.
| |
2. Doors that are not required egress doors and are served by
a stairway with no more than three (3) risers.
| |
3. Doors protected by a guard in accordance with this code.
| |
4. Doors protected in a manner approved by the Building Official.
|
Exception:
| |
1. A floor or landing is not required at the top of an interior
flight of stairs, including stairs in an enclosed garage, provided
that a door does not swing over the stairs.
| |
2. Where not required by Section R311.3 and Section R311.3.2.
|
Load-Bearing Value of Soil
(psf)
| ||||
---|---|---|---|---|
1,500
|
2,000
|
3,000
|
>=4,000
| |
Conventional light-frame construction
| ||||
1-story
|
17
|
16
|
16
|
16
|
2-story
|
20
|
16
|
16
|
16
|
3-story
|
23
|
17
|
16
|
16
|
Masonry veneer over light frame
| ||||
1-story
|
21
|
16
|
16
|
16
|
2-story
|
26
|
20
|
16
|
16
|
3-story
|
32
|
24
|
16
|
16
|
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
|
Exceptions:
| |
1. Protection of freestanding accessory structures with an area
of two hundred (200) square feet (18.5 m2) or less, of light-frame
construction, with an eave height of ten (10) feet (3,048 mm) or less
shall not be required.
| |
2. Protection of freestanding accessory structures with an area
of two hundred (200) square feet (18.5 m2) or less, of other than
light-frame construction, with an eave height of ten (10) feet (3,048
mm) or less shall not be required.
| |
3. Decks not supported by a dwelling and not more than four
(4) feet (1.22 m) above the surrounding grade need not be provided
with footings that extend below the frost line.
|
Maximum Wall Height
|
Maximum Depth of Unbalanced Backfill
|
Minimum Nominal Wall Thickness
|
---|---|---|
8'-0"
|
7'-6" or less
|
8" (Note a)
|
9'-0"
|
8'-6" or less
|
10" (Note b)
|
10'-0"
|
9'-6" or less
|
12" (Note c)
|
a.
|
Concrete foundation walls may be constructed a minimum of nominal
eight (8) inches thick where the wall height from the top of the footing
to the top of the wall does not exceed eight (8) feet. A minimum of
two #4 reinforcing bars shall be placed horizontally in the top and
bottom of the foundation wall. A minimum of two #5 reinforcing bars
shall be provided around all window and door openings in concrete
foundation and basement walls; bars shall extend a minimum of twenty-four
(24) inches beyond the corners of the openings.
|
b.
|
Concrete foundation walls may be constructed a minimum of nominal
ten (10) inches thick. A minimum of two #5 reinforcing bars shall
be placed horizontally in the top, middle, and bottom of the foundation
wall. A minimum of two #5 reinforcing bars shall be provided around
all window and door openings in concrete foundation and basement walls;
bars shall extend a minimum of twenty-four (24) inches beyond the
corners of the openings.
|
c.
|
Concrete foundation walls may be constructed a minimum of nominal
twelve (12) inches thick. A minimum of three #5 reinforcing bars shall
be placed horizontally in the top, middle, and bottom of the foundation
wall. A minimum of two (2) #5 reinforcing bars shall be provided around
all window and door openings in concrete foundation and basement walls;
bars shall extend a minimum of twenty-four (24) inches beyond the
corners of the openings.
|
d.
|
The concrete minimum wall thickness shall be eight (8) inches
for foundation walls in soil classes SC, MH, ML-CL and inorganic CL
when maximum wall height is eight (8) feet.
|
e.
|
The concrete minimum wall thickness shall be ten (10) inches
for foundation walls in soil classes SC, MH, ML-CL and inorganic CL
when the maximum wall height is nine (9) feet.
|
f.
|
The concrete minimum wall thickness shall be twelve (12) inches
for foundation walls in soil classes SC, MH, ML-CL and inorganic CL
when the maximum wall height is ten (10) feet.
|
Exception:
| |
1. A drainage system is not required where the foundation is
installed on well-drained ground or sand-gravel mixture soils according
to the Unified Soil Classification System, Group I soils, as detailed
in Table R405.1.
| |
2. Drains provided as detailed in Section R405.1.90 are approved
as an alternative method to meet the requirements of this Section.
|
Table R602.7.5
Minimum Number of Full-Height Studs at Each End of Headers in
Exterior Walls
| ||
---|---|---|
Maximum Header Span
(feet)
|
Ultimate Design Wind Speed and Exposure Category
| |
< 140 mph, Exposure B or < 130 mph, Exposure C
|
< 115 mph, Exposure Bb
| |
4
|
1
|
1
|
6
|
2
|
1
|
8
|
2
|
1
|
10
|
3
|
2
|
12
|
3
|
2
|
14
|
3
|
2
|
16
|
4
|
2
|
18
|
4
|
2
|
NOTES:
| |
a.
|
For header spans between those given above, use the minimum
number of full-height studs associated with the larger header span.
|
b.
|
The tabulated minimum number of full-height studs is applicable
where jack studs are provided to support the header at each end in
accordance with Table R602.7(1). Where framing anchors are used to
support the header in lieu of a jack stud in accordance with footnote
"d" of Table R602.7(1), the minimum number of full-height studs at
each end of a header shall be in accordance with requirements for
wind speed < 140 mph, Exposure B.
|
Table N1102.1.2 (R402.1.2)
Insulation and Fenestration Requirements by Component
| ||
---|---|---|
Climate zone
|
4
| |
Fenestration U-factor
|
0.35
| |
Skylight U-factor
|
0.60
|
See Note B
|
Glazed fenestration SHGC
|
NR
| |
Ceiling R-value
|
38
| |
Wood frame wall R-value
|
13
| |
Mass wall R-value
|
8/13
|
See Note I
|
Floor R-value
|
19
| |
Basement wall R-value
|
0
|
See Note J
|
Slab R-value and depth
|
10, 2 ft
|
See Note D
|
Crawl space wall R-value
|
10/13
|
See Note C
|
NOTES:
| |
a.
|
R-values are minimums. U-factors and SHGC are maximums. When
insulation is installed in a cavity which is less than the label or
design thickness of the insulation, the installed R-value of the insulation
shall not be less than the R-value specified in the table.
|
b.
|
The fenestration U-factor column excludes skylights. The SHGC
column applies to all glazed fenestration.
|
c.
|
"15/19" means R-15 continuous insulation on the interior or
exterior of the home or R-19 cavity insulation at the interior of
the basement wall. "15/19" shall be permitted to be met with R-13
cavity insulation on the interior of the basement wall plus R-5 continuous
insulation on the interior or exterior of the home. "10/13" means
R-10 continuous insulation on the interior or exterior of the home
or R-13 cavity insulation at the interior of the basement wall.
|
d.
|
R-5 shall be added to the required slab edge R-values for heated
slabs. Insulation depth shall be the depth of the footing or two (2)
feet, whichever is less in Zones 1 through 3 for heated slabs.
|
e.
|
(Reserved)
|
f.
|
(Reserved)
|
g.
|
(Reserved)
|
h.
|
(Reserved)
|
i.
|
The second R-value applies when more than one-half (1/2) the
insulation is on the interior of the mass wall.
|
j.
|
Band boards and cripple walls shall be insulated to R-13.
|
Table N1102.1.5
Minimum Projection Factor Required by Orientation for SHGC
| |
---|---|
Orientation
|
Projection Factor
|
North
|
>0.40a
|
South
|
>0.20
|
East
|
>0.50
|
West
|
>0.50
|
NOTES:
| |
a.
|
For the north orientation, a vertical projection located on
the west edge of the fenestration with the equivalent of PF>0.15 shall
also satisfy the minimum projection factor requirements.
|
Component
|
Air Barrier Criteria
|
Insulation Installation Criteria
|
---|---|---|
General requirements
|
A continuous air barrier shall be installed in the building
envelope. The exterior thermal envelope contains a continuous air
barrier. Breaks or joints in the air barrier shall be sealed.
|
Air-permeable insulation shall not be used as a sealing material.
|
Ceiling/attic
|
The air barrier in any dropped ceiling/soffit shall be aligned
with the insulation and any gaps in the air barrier sealed. Access
openings, drop-down stairs or knee-wall doors to unconditioned attic
spaces shall be sealed.
|
The insulation in any dropped ceiling/soffit shall be aligned
with the air barrier.
|
Walls
|
The junction of the foundation and sill plate shall be sealed.
The junction of the top plate and the top of exterior walls shall
be sealed. Knee walls shall be sealed.
|
Cavities within corners and headers of frame walls shall be
insulated by completely filling the cavity with a material having
a thermal resistance of R-3 per inch minimum. Exterior thermal envelope
insulation for framed walls shall be installed in substantial contact
and continuous alignment with the air barrier.
|
Windows, skylights and doors
|
The space between window/door jambs and framing, and skylights
and framing, shall be sealed.
| |
Rim joists
|
Rim joists shall include the air barrier.
|
Rim joists shall be insulated.
|
Floors (including above garage and cantilevered floors)
|
The air barrier shall be installed at any exposed edge of insulation.
|
Floor framing cavity insulation shall be installed to maintain
permanent contact with the underside of subfloor decking, or floor
framing cavity insulation shall be permitted to be in contact with
the top side of sheathing, or continuous insulation installed on the
underside of floor framing; and extends from the bottom to the top
of all perimeter floor framing members.
|
Crawl space walls
|
Exposed earth in unvented crawl spaces shall be covered with
a Class I vapor retarder with overlapping joints taped.
|
Where provided instead of floor insulation, insulation shall
be permanently attached to the crawl space walls.
|
Shafts, penetrations
|
Ductshafts, utility penetrations, and flue shafts opening to
exterior or unconditioned space shall be sealed.
| |
Narrow cavities
|
Batts in narrow cavities shall be cut to fit, or narrow cavities
shall be filled by insulation that on installation readily conforms
to the available cavity space.
| |
Garage separation
|
Air sealing shall be provided between the garage and conditioned
spaces.
| |
Recessed lighting
|
Recessed light fixtures installed in the building thermal envelope
shall be sealed to the drywall.
|
Recessed light fixtures installed in the building thermal envelope
shall be sealed to the drywall by means such as, but not limited to,
a gasketed fixture.
|
Plumbing and wiring
|
Batt insulation shall be cut neatly to fit around wiring and
plumbing in exterior walls, or insulation that on installation readily
conforms to available space shall extend behind piping and wiring.
| |
Shower/tub on exterior wall
|
The air barrier installed at exterior walls adjacent to showers
and tubs shall separate them from the showers and tubs.
|
Exterior walls adjacent to showers and tubs shall be insulated.
|
Electrical/phone box on exterior walls
|
The air barrier shall be installed behind electrical or communication
boxes, or air-sealed boxes shall be installed.
| |
HVAC register boots
|
HVAC register boots that penetrate building thermal envelope
shall be sealed.
| |
Concealed sprinklers
|
When required to be sealed, concealed fire sprinklers shall
only be sealed in a manner that is recommended by the manufacturer.
Caulking or other adhesive sealants shall not be used to fill voids
between fire sprinkler cover plates and walls or ceilings.
|
During testing:
| |
1. Exterior windows and doors, fireplace and stove doors shall
be closed, but not sealed, beyond the intended weather stripping or
other infiltration control measures.
| |
2. Dampers, including exhaust, intake, makeup air, backdraft
and flue dampers shall be closed, but not sealed beyond intended infiltration
control measures.
| |
3. Interior doors, if installed at the time of the test, shall
be open.
| |
4. Exterior doors for continuous ventilation systems and heat
recovery ventilators shall be closed and sealed.
| |
5. Heating and cooling systems, if installed at the time of
the test, shall be turned off.
| |
6. Supply and return registers, if installed at the time of
the test, shall be fully open.
|
Exceptions:
| |
1. Direct vent appliances with both intake and exhaust pipes
installed continuous to the outside.
| |
2. Fireplaces and stoves complying with Sections N1102.4.2 and
R1006.
| |
3. Mechanical equipment in an unfinished space.
|
Exceptions:
| |
1. Air-impermeable spray foam products shall be permitted to
be applied without additional joint seals.
| |
2. For ducts having a static pressure classification of less
than two (2) inches of water column (500 Pa), additional closure systems
shall not be required for continuously welded joints and seams, and
locking-type joints and seams of other than the snap-lock and button-lock
types.
| |
3. Sealing is not required where the air handler and ducts are
located within conditioned space as determined by the Building Code
Official.
|
Building Component
|
Standard Referenced Design
|
Proposed Design
|
---|---|---|
Above-grade walls
|
Type: mass wall if proposed wall is mass; otherwise wood frame
|
As proposed
|
Gross area: same as proposed
|
As proposed
| |
U-factor: as specified in Table N1102.1.4
|
As proposed
| |
Solar absorbance = 0.75
|
As proposed
| |
Remittance = 0.90
|
As proposed
| |
Basement and crawl space walls
|
Type: same as proposed
|
As proposed
|
Gross area: same as proposed
|
As proposed
| |
U-factor: from Table N1102.1.4, with insulation layer on interior
side of walls
|
As proposed
| |
Above-grade floors
|
Type: wood frame
|
As proposed
|
Gross area: same as proposed
|
As proposed
| |
U-factor: as specified in Table N1102.1.4
|
As proposed
| |
Ceilings
|
Type: wood frame
|
As proposed
|
Gross area: same as proposed
|
As proposed
| |
U-factor: as specified in Table N1102.1.4
|
As proposed
| |
Roofs
|
Type: composition shingle on wood sheathing
|
As proposed
|
Gross area: same as proposed
|
As proposed
| |
Solar absorbance = 0.75
|
As proposed
| |
Emittance = 0.90
|
As proposed
| |
Attics
|
Type: vented with aperture = 1 ft2 per 300 ft2 ceiling area
|
As proposed
|
Foundations
|
Type: same as proposed
|
As proposed
|
Foundation wall area above and below grade and soil characteristics:
same as proposed
|
As proposed
| |
Opaque doors
|
Area: 40 ft2
|
As proposed
|
Orientation: north
|
As proposed
| |
U-factor: same as fenestration from Table N1102.1.4
|
As proposed
| |
Vertical fenestration other than opaque doors
|
Total areab = 15% of the conditioned
floor area
|
As proposed
|
Orientation: equally distributed to 4 cardinal compass orientations
(N, E, S and W)
|
As proposed
| |
U-factor: as specified in Table N1102.1.4
|
As proposed
| |
SHGC: as specified in Table N1102.1.2, except that for climates
with no requirement (NR) SHGC = 0.40 shall be used
|
As proposed
| |
Interior shade fraction: 0.92 - (0.21 x SHGC for the standard
reference design)
|
0.92 - (0.21 x SHGC as proposed)
| |
External shading: none
|
As proposed
| |
Skylights
|
None
|
As proposed
|
Thermally isolated sunrooms
|
None
|
As proposed
|
Air exchange rate
|
Air leakage rate of 5 air changes per hour at a pressure of
0.2 inches w.g. (50 Pa). The mechanical ventilation rate shall be
in addition to the air leakage rate and the same as in the proposed
design, but no greater than 0.01 x CFA + 7.5 x (Nbr + 1)
where:
CFA = conditioned floor area Nbr = number of bedrooms
Energy recovery shall not be assumed for mechanical
|
For residences that are not tested, the same air leakage rate
as the standard reference design. For tested residences, the measured
air exchange ratea.
The mechanical ventilation rateb shall
be in addition to the air leakage rate and shall be proposed
|
Mechanical ventilation
|
None, except where mechanical ventilation is specified by the
proposed design, in which case:
Annual vent fan energy use: kWh/yr = 0.03942 x CFA + 29.565
x (Nbr + 1)
Where:
CFA = conditioned floor area
Nbr = number of bedrooms
|
As proposed
|
Internal gains
|
IGain = 17,900 + 23.8 x CFA + 4104 x Nbr (Btu/day per dwelling unit)
|
Same as standard reference design
|
Internal mass
|
An internal mass for furniture and contents of 8 pounds per
square foot of floor area
|
Same as standard reference design, plus any additional mass
specifically designed as a thermal storage elementc but not integral to the building envelope or structure
|
Structural mass
|
For masonry floor slabs, 80% of floor area covered by R-2 carpet
and pad, and 20% of floor directly exposed to room air
|
As proposed
|
For masonry basement walls, as proposed, but with insulation
required by Table R402.1.4 located on the interior side of the walls
|
As proposed
| |
For other walls, for ceilings, floors, and interior walls, wood
frame construction
|
As proposed
| |
Heating systemsd, e
|
Fuel type: same as the proposed design Efficiencies:
Electric: air-source heat pump with prevailing Federal minimum
standards
Non-electric furnaces: natural gas furnace with prevailing Federal
minimum standards
Non-electric boilers: natural gas boiler with prevailing Federal
minimum standards
Capacity: sized in accordance with Section N1103.7.
|
As proposed
|
Cooling systemsd, f
|
Fuel type: electric
Efficiency: in accordance with prevailing Federal minimum standards
Capacity: sized in accordance with Section N1103.7
|
As proposed
|
Service water heatingd, e, f
|
Fuel type: same as proposed design
Efficiency: in accordance with prevailing Federal minimum standards
Use: gal/day = 30 + 10 x Nbr
Tank temperature: 120° F.
Where:
Nbr = number of bedrooms
|
As proposed Same as standard reference
|
Thermal distribution systems
|
Duct insulation: from Section N1103.2.1 A thermal distribution
system efficiency (DSE) of 0.88 shall be applied to both the heating
and cooling system efficiencies for all systems other than tested
duct systems. For tested duct systems, the leakage rate shall be 4
cfm (113.3 L/min) per 100 ft2 (9.29 m2) of conditioned floor area at a pressure of differential
of 0.1 inches w.g. (25 Pa)
|
As tested or specified in Table R405.5.2(2) if not tested. Duct
insulation shall be as proposed.
|
Thermostat
|
Type: Manual, cooling temperature setpoint = 75° F.
Heating temperature setpoint = 72° F.
|
Same as standard reference
|
For SI: 1 square foot = 0.93 m2; 1 British thermal unit = 1055J;
1 pound per square foot = 4.88 kg/m2; 1 gallon (US) = 3.785 L; °C
= (°F-32)/1.8; 1 degree = 0.79 rad
|
NOTES:
| |
a.
|
Where required by the code official, testing shall be conducted
by an approved party. Hourly calculations as specified in the ASHRAE
Handbook of Fundamentals, or the equivalent, shall be used to determine
the energy loads resulting from infiltration.
|
b.
|
The combined air exchange rate for infiltration and mechanical
ventilation shall be determined in accordance with Equation 43 of
2001 ASHRAE Handbook of Fundamentals, page 26.24, and the "Whole-House
Ventilation" provisions of 2001 ASHRAE Handbook of Fundamentals, page
26.19, for intermittent mechanical ventilation.
|
c.
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"Thermal storage element" shall mean a component not part of
the floors, walls or ceilings that is part of a passive solar system,
and that provides thermal storage such as enclosed water columns,
rock beds, or phase-change containers. A thermal storage element must
be in the same room as fenestration that faces within fifteen degrees
(15°) (0.26 rad) of true south, or must be connected to such a
room with pipes or ducts that allow the element to be actively charged.
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d.
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For a proposed design with multiple heating, cooling or water
heating systems using different fuel types, the applicable standard
reference design system capacities and fuel types shall be weighted
in accordance with their respective loads as calculated by accepted
engineering practice for each equipment and fuel type present.
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e.
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For a proposed design without a proposed heating system, a heating
system with the prevailing Federal minimum efficiency shall be assumed
for both the standard reference design and proposed design.
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f.
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For a proposed design home without a proposed cooling system,
an electric air conditioner with the prevailing Federal minimum efficiency
shall be assumed for both the standard reference design and the proposed
design.
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g.
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For a proposed design with a non-storage-type water heater,
a forty-gallon storage-type water heater with the prevailing Federal
minimum energy factor for the same fuel as the predominant heating
fuel type shall be assumed. For the case of a proposed design without
a proposed water heater, a forty-gallon storage-type water heater
with the prevailing Federal minimum efficiency for the same fuel as
the predominant heating fuel type shall be assumed for both the proposed
design and standard reference design.
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Exceptions:
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1. Spray polyurethane foam shall be permitted to be applied
without additional joint seals.
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2. Where a duct connection is made that is partially inaccessible,
three (3) screws or rivets shall be equally spaced on the exposed
portion of the joint so as to prevent a hinge effect.
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3. Continuously welded and locking-type longitudinal joints
and seams in ducts operating at static pressure less than two (2)
inches of water column (500 Pa) pressure classification shall not
require additional closure systems.
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Exceptions:
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1. Taking return air from a kitchen is not prohibited where
such return air openings serve the kitchen only, and are located not
less than ten (10) feet (3,048 mm) from the cooking appliances.
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2. Dedicated forced-air systems serving only the garage shall
not be prohibited from obtaining return air from the garage.
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3. Taking return air from an unconditioned crawl space shall
not be accomplished through a direct connection to the return side
of a forced-air furnace. Transfer openings in the crawl space enclosure
shall not be prohibited.
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4. Return air from one (1) dwelling unit shall not be discharged
into another dwelling unit.
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5. Return air may be taken from a bedroom closet over sixty-four
(64) square feet in area.
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Exceptions:
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1. A receptacle supplying only a permanently installed fire
alarm or burglar alarm system. Receptacles installed in accordance
with this exception shall not be considered as meeting the requirement
of Section E3901.9. [210.8(A)(5) Exception]
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2. Where a simplex receptacle is installed to serve an installed
sump pump.
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Exceptions:
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1. Openable windows may be added without requiring compliance
with the light and ventilation requirements of Section R303.
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2. Newly installed electrical equipment shall comply with the
requirements of Section AJ501.5.
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3. An existing stairway being rebuilt shall not be required
to comply with the requirements of Section R311.7.5 if the existing
space and construction does not allow for a reduction in pitch or
slope.
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