Exception: When a crawl space or supporting wall
is below a walkout basement, that supporting wall is to be engineered
but will not be considered a story.
|
Each townhouse shall be considered a separate building and shall
be separated by fire-resistance-rated wall assemblies meeting the
requirements of Section R302.1 as amended for exterior walls.
|
Each townhouse may be separated with two one-hour fire-resistant
exterior walls or a common two-hour fire-resistant-rated wall. The
two-hour fire-resistant common wall shall not be used for any plumbing
or mechanical equipment, including ducts or vents. Electrical outlet
box penetrations of the common two-hour fire-resistant assembly shall
be installed in accordance with Section R302.4. A parapet is required
above the two-hour common wall or two one-hour fire-resistant exterior
walls constructed in accordance with Section R302.2.3.
|
Table R507.9.1.3(1) Deck Ledger Connection to Band Joist
| |||||||
---|---|---|---|---|---|---|---|
(Deck Live Load = 40 psf, Deck Dead Load = 10 psf, Snow Load
< 40 psf)
| |||||||
Joist Span
|
6'-0" and Less
|
6'-1" to 8'-0"
|
8'-1" to 10'-0"
|
10'-1" to 12'-0"
|
12'-1" to 14'-0"
|
14'-1" to 16'-0"
|
16'-1" to 18'-0"
|
Connection Details
|
On-Center Spacing of Fastenersd,e
| ||||||
1/2-inch diameter lag screw with 1/2-inch maximum sheathing
|
16
|
16
|
16
|
15
|
13
|
11
|
10
|
1/2-inch diameter bolt with 1/2-inch maximum sheathing
|
24
|
24
|
24
|
24
|
24
|
21
|
19
|
1/2-inch diameter bolt with 1-inch maximum sheathing
|
24
|
24
|
24
|
24
|
21
|
18
|
16
|
Table N1102.1.2 (R402.1.2)
Insulation and Fenestration Requirements by Componenta
| ||||
---|---|---|---|---|
Climate Zone
|
Fenestration U-Factorb
|
Skylightb U-Factor
|
Glazed Fenestration SHGCb,e
|
Ceiling R-Value
|
1
|
NR
|
0.75
|
0.25
|
30
|
2
|
0.40
|
0.65
|
0.25
|
38
|
3
|
0.35
|
0.55
|
0.25
|
38
|
4 except Marine
|
0.40
|
0.55
|
NR
|
38
|
5 and Marine 4
|
0.32
|
0.55
|
NR
|
49
|
6
|
0.32
|
0.55
|
NR
|
49
|
7 and 8
|
0.32
|
0.55
|
NR
|
49
|
Climate Zone
|
Wood Frame Wall R-Value
|
Mass Wall R-Valuei
|
Floor R-Value
|
Basementc Wall R-Value
|
Slabd R-Value and Depth
|
Crawl Spacec Wall R-Value
|
---|---|---|---|---|---|---|
1
|
13
|
3/4
|
13
|
0
|
0
|
0
|
2
|
13
|
4/6
|
13
|
0
|
0
|
0
|
3
|
20 or 13 + 5h
|
8/13
|
19
|
5/13f
|
0
|
5/13
|
4 except Marine
|
13l,m
|
8/13
|
19
|
0j,k
|
10, 2 ft
|
10/13
|
5 and Marine 4
|
20 or 13 + 5h
|
13/17
|
30g
|
15/19
|
10, 2 ft
|
15/19
|
6
|
20 + 5 or 13 + 10h
|
15/20
|
30g
|
15/19
|
10, 4 ft
|
15/19
|
7 and 8
|
20 + 5 or 13 + 10h
|
19/21
|
38g
|
15/19
|
10, 4 ft
|
15/19
|
NOTES:
| |
For SI: 1 foot = 304.8mm.
| |
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. Exception: Skylights may
be excluded from glazed fenestration SHGC requirements in Climate
Zones 1 through 3 where the SHGC for such skylights does not exceed
0.30.
|
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 three (3) for heated slabs.
|
e
|
There are no SHGC requirements in the Marine Zone.
|
f
|
Basement wall insulation is not required in warm-humid locations
as defined by Figure N1101.10 or Table N1101.10.
|
g
|
Or insulation sufficient to fill the framing cavity, R-19 minimum.
|
h
|
The first value is cavity insulation, the second value is continuous
insulation, so "13+5" means R-13 cavity insulation plus R-5 continuous
insulation.
|
i
|
The second R-value applies when more than half of the insulation
is on the interior of the mass wall.
|
j
|
Exception: Unfinished basements may have up to a maximum of
twenty percent (20%) of the total basement wall area exposed above
the outside finished grade/ground level as uninsulated concrete foundation
walls. The foundation wall area above the outside grade/ground level
that may be uninsulated is determined by the formula [.20 times the
basement wall height of all walls (including insulated exterior frame
walls for walkout basements and walls common to both basement and
attached garages) times the perimeter of these basement walls]. In
unfinished areas, the basement foundation wall insulation shall extend
down to the basement floor slab or to a minimum of twenty-four (24)
inches below outside finished grade when the grade is above the floor
slab elevation.
|
k
|
Basement blankets will be required only to depth of the frost
line.
|
l
|
Low expansive foam shall be used around doors and windows. Foam
insulations shall be applied around all exterior wall penetrations
and electrical boxes, and caulking shall be applied at the top and
bottom of wall plates.
|
m
|
Exhaust systems shall be installed in the home and designed
to have the capacity to exhaust a minimum air flow rate of 50 cfm
intermittent or 20 cfm continuous to help provide outside air through
typical home use and passive air infiltration.
|
Table N1102.4.1.1 (402.4.1.1)
Air Barrier and Insulation Installation
| ||
---|---|---|
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 the 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
Class I vapor retarder with overlapping joists taped.
|
Where provided instead of floor insulation, insulation shall
be permanently attached to the crawl space walls.
|
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.
| |
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 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.
| |
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.
|
NOTES:
| |
a.
|
In addition, inspection of log walls shall be in accordance
with the provisions of ICC 400.
|
Table N1105.5.2(1) [R405.5.2(1)]
Specifications for the Standard Reference and Proposed
Designs
| ||
---|---|---|
Building Component
|
Standard Reference 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 absorptance = 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 absorptance = 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 four cardinal compass orientations
(N, E, S & 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 in Climate Zones
1 and 2, and 3 air changes per hour in Climate Zones 3 through 8 at
a pressure of two tenths (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 ventilation.
|
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
Nonelectric Furnaces: natural gas furnace with prevailing Federal
minimum standards
Nonelectric 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.
|
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
|
NOTES:
| |
For SI: 1 square foot = 0.93 m2,
1 British thermal unit = 1055 J, 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
| |
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
|
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.
|
d
|
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.
|
e
|
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.
|
f
|
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.
|
g
|
For a proposed design with a nonstorage-type water heater, a
forty (40) 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 (40) 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.
|
Table M1601.1.1
Duct Construction Minimum Sheet Metal Thickness for Single Dwelling
Unitsa
| ||||
---|---|---|---|---|
Round Duct Diameter
(inches)
|
Static Pressure
| |||
1/2 inch water gage
|
1 inch water gage
| |||
Thickness (inches)
|
Thickness (inches)
| |||
Galvanized
|
Aluminum
|
Galvanized
|
Aluminum
| |
< 12
|
0.013
|
0.018
|
0.013
|
0.018
|
12 to 14
|
0.013
|
0.018
|
0.016
|
0.023
|
15 to 17
|
0.016
|
0.023
|
0.019
|
0.027
|
18
|
0.016
|
0.023
|
0.024
|
0.034
|
19 to 20
|
0.019
|
0.027
|
0.024
|
0.034
|
Rectangular Duct Dimension
(largest dimension)
|
Static Pressure
| |||
---|---|---|---|---|
1/2 inch water gage
|
1 inch water gage
| |||
Thickness (inches)
|
Thickness (inches)
| |||
Galvanized
|
Aluminum
|
Galvanized
|
Aluminum
| |
< 8
|
0.013
|
0.018
|
0.013
|
0.018
|
9 to 10
|
0.013
|
0.018
|
0.016
|
0.023
|
11 to 12
|
0.016
|
0.023
|
0.019
|
0.027
|
13 to 16
|
0.016
|
0.027
|
0.019
|
0.027
|
17 to 18
|
0.019
|
0.027
|
0.024
|
0.034
|
19 to 20
|
0.019
|
0.034
|
0.024
|
0.034
|
NOTES:
| |
For SI: 1 inch = 25.4 mm, 1 inch water gage = 249 Pa.
| |
a.
|
Ductwork that exceeds twenty (20) inches by dimension or exceeds
a pressure of one (1) inch water gage shall be constructed in accordance
with SMACNA HVAC Duct Construction Standards - Metal and Flexible.
|
Exception:
| |
•
|
AFCI protection shall not be required for an individual branch
circuit supplying a fire alarm system where the branch circuit is
installed in a metal raceway, metal auxiliary gutter, steel-armored
cable, Type MC or Type AC, meeting the requirements of Section E3908.9,
with metal boxes, conduit bodies and enclosures.
|
•
|
AFCI protection shall not be required for all kitchen countertop
receptacles, laundry receptacles and/or other already required GFCI
protected outlets.
|
Exception: AFCI protection shall not be required
where the extension of the existing branch circuit conductors is not
more than thirty (30) feet (9.5 m) in length and does not include
any additional outlets or devices other than splicing devices. This
measurement shall not include the conductors inside an enclosure,
cabinet or junction box. [210.12(B) Exception]
|