Ground Snow Load
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Wind Design
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Seis-mic Design Cate-gory
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Subject to Damage From
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---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Speed
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Topo-graphic Effects
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Special Wind Region
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Wind-Borne Debris Zone
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Weath-ering
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Frost Line Depth
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Ter-mite
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Winter Design Temp
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Ice Bar-rier Under-lay-ment Re-quired
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Flood Haz-ards
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Air Freez-ing Index
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Mean Annual Temp
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25 lbs./sq. ft.
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115 mph
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No
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No
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No
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A
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Severe
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24"
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Yes
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18° F.
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No
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3-15-19787-2014
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596
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54° F.
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MANUAL J DESIGN CRITERIA
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Elevation
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Latitude
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Winter Heating
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Sum-mer Cooling
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Alti-tude Correc-tion Factor
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Indoor Design Temperature
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Design Temperature Cooling
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Heating Temperature Difference
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23 ft.
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39°
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18° F.
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89° F.
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1.0
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72° F.
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75° F.
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56° F.
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Cooling Temperature Difference
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Wind Velocity Heating
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Wind Velocity Cooling
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Coin-cident Wet Bulb
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Daily Range
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Winter Humidity
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Summer Humidity
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14° F.
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15 mph
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7.5 mph
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75
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M
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50%
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50%
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R310.2.5.1. Replacement window. At least one emergency escape
and rescue opening complying with Section 310.2 is required in any
sleeping room that is being added or gutted due to renovation to a
structure.
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R311.7.5. Stair treads and risers. Stair treads and risers shall
meet the requirements of this section. For the purposes of this section,
all dimensions and dimensioned surfaces shall be exclusive of carpets,
rugs or runners.
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R311.7.5.1. Risers. The maximum riser height shall
be 8 1/4 inches (209.6 mm). The riser shall be measured vertically
between leading edges of the adjacent treads. The greatest riser height
within any flight of stairs shall not exceed the smallest by more
than 3/8 inch (9.5 mm). The riser height at landings with hinged doors
shall be measured from the landing vertically to the top of the threshold
(not the compression strip). The riser height at landings with sliding
doors shall be measured from the landing vertically to the top of
the highest projection of the door track. Risers shall be vertical
or sloped from the underside of the nosing of the tread above at an
angle not more than 30° (0.51 rad) from the vertical. Open risers
are permitted provided that the opening between treads does not permit
the passage of a 6-inch-diameter (102 mm) sphere.
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Exceptions:
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(1)
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The opening between adjacent treads is not limited on spiral
stairways.
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(2)
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The riser height of spiral stairways shall be in accordance
with Section R311.7.10.1.
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R311.7.5.2. Treads. The minimum tread depth shall
be 9 inches (229 mm). 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 greatest
tread depth within any flight of stairs shall not exceed the smallest
by more than 3/8 inch (9.5 mm).
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R313.1. Townhouse automatic fire sprinkler systems. An automatic
residential fire sprinkler system may be installed in townhouses.
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R313.2. One- and two-family dwelling automatic fire sprinkler
systems. An automatic residential fire sprinkler system may be installed
in one- and two-family dwellings.
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R315.2.1. New construction. For new construction, carbon monoxide
alarms shall be provided in dwelling units.
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R324.6. Roof access and pathways. Delete as written and add:
Roof access, pathways and setback requirements shall be provided in
accordance with Sections R324.6.1 and R324.6.2, through R324.6.2.1.
Access and minimum spacing shall be required to provide emergency
access to the roof, to provide pathways to specific areas of the roof,
to provide for smoke ventilation opportunity areas, and to provide
emergency egress from the roof.
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R324.6.1. Pathways. Delete as written and add: A
36" pathway shall be provided on all edges, valleys and hips of roofs.
Pathways on townhomes shall maintain at least 18" from the property
line if the roof on either side of the property line shares the same
plane. If the plane of the roof is different, a 36" pathway shall
be provided on each side.
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R324.6.2. Setback at ridge. Delete as written and
replace with: A 36" clear setback is required on each side of the
horizontal ridge.
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R324.6.2.1. Alternative setback at ridge. Delete
as written.
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All continuous footings shall be a minimum of 8" depth by 16"
width. Footings shall be sized to support the imposed loads. Footing
projections, P, shall be not less than 2 inches (51 mm) and shall
not exceed the thickness of the footing. Footing thickness and projection
for fireplaces shall be in accordance with Section R1001.2. The size
of footings supporting piers and columns shall be based on the tributary
load and allowable soil pressure in accordance with Table R401.4.1.
Footings for wood foundations shall be in accordance with details
set forth in Section R403.2, and Figures R403.1 (2) and R403.1 (3).
Footings for precast foundations shall be in accordance with the details
set forth in Section R403.4, Table R403.4, and Figures R403.4 (1)
and R403.4 (2).
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Exceptions:
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1.
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Minimum footings for single-story decks shall be 3 times the
widest nominally measured side of the post. Footings must also be
sized to support the imposed loads; interior post locations support
more weight than perimeter posts.
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2.
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Decks having vertical members spaced 6 feet (1,289 mm) on center
or less may be placed on a 4 inch (101 mm) concrete pad, provided
the vertical members are placed 12 inches (305 mm) inside the perimeter
of the pad and are anchored on all corners with approved anchoring
devices. Decks 20 feet (6,096 mm) or more in length shall have two
additional anchors installed on each side mid-span.
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3.
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Residential accessory structures less than 300 square feet (27
square meters) in area, with the exception of a pole building and
garage, shall be leveled and secured with tie-downs or equivalent
manufactured home anchoring devices, one in each corner. Structures
20 feet (6,096 mm) or more in length shall have two additional anchors
installed on each side mid-span. All lumber and wood siding is to
be pressure-treated from grade to 8 inches (203 mm) above finished
grade. Pressure-treated lumber shall meet the requirements set forth
in Section R317.
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4.
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Prefabricated room enclosures are to be placed on an approved
support system per the manufacturer's installation instruction.
|
R405.1. Concrete or masonry foundations. Drains shall be provided
around concrete or masonry foundations that retain earth and enclose
crawl space/basements of habitable or usable spaces located below
grade. Drainage tiles, gravel or crushed stone drains, perforated
pipe or other approved systems or materials shall be installed at
or below the top of the footing or below the bottom of the slab and
shall discharge by gravity or mechanical means into an approved drainage
system. Gravel or crushed stone drains shall extend not less than
1 foot (305 mm) above the top of the footing and be covered with an
approved filter membrane material. The top of open joints of drain
ties shall be protected with strips of building paper. Except where
otherwise recommended by the drain manufacturer, perforated drains
shall be surrounded with an approved filter membrane or the filter
membrane shall cover the washed gravel or crushed rock covering the
drain. Drainage tiles or perforated pipe shall be placed on not less
than two inches (51 mm) of washed gravel or crushed rock not less
than one sieve size larger than the tile joint opening or perforation
and covered with not less than six inches (152 mm) of the same material.
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Exception: 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 1 soils, as detailed in Table R405.1
|
R405.2.3. Drainage systems. In other than Group 1 soils, a sump
shall be provided to drain the porous layer and footings. The sump
shall be not less than 24 inches (610 mm) in diameter or 20 inches
square (0.0129 m2), shall extend not less
than 24 inches (610 mm) below the bottom of the crawl space or basement
floor and shall be capable of positive gravity or mechanical drainage
to remove any accumulated water. The drainage system shall discharge
into an approved sewer system or to daylight
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R502.3. Allowable joist spans. Spans for floor joists shall
be in accordance with Tables R502.3.1(1) and R502.3.1 (2). For other
grades and species and for other loading conditions, refer to the
AWC STJR.
|
R502.3.4. Deck floor joist spans. Deck floor joist spans shall
be in accordance with the American Forest and Paper, Design for Acceptance
#6, Prescriptive Residential Wood Deck Construction Guide.
|
R502.5. Allowable girder and header spans. The allowable spans
of girders and headers fabricated of dimension lumber shall not exceed
the values set forth in Tables R602.7 (1), and R602.7 (2) and R602.7
(3).
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R502.5.1. Deck girder spans. Deck girder spans shall be in accordance
with the American Forest and Paper, Design for Acceptance #6, Prescriptive
Residential Wood Deck Construction Guide.
|
R602.10. Wall bracing. Buildings shall be braced in accordance
with this section or, when applicable, Section R602.12. Where a building,
or portion thereof, does not comply with one or more of the bracing
requirements in this section, those portions shall be designed and
constructed in accordance with Section R301.1.
|
Exception: Porches with roofs and screen porches
shall not be required to comply with the requirements of R602.10.
Wall bracing, when constructed with approved translucent or transparent
plastic not more than 0.125 inch (3.2 mm) in thickness.
|
R611.1. Definitions. POST FRAME BUILDING: A structural building
frame consisting of a wood truss or rafters connected to vertical
timber columns or sidewall posts, which function as the principal
gravity and load resisting elements of the building. A building used
for motor vehicles is considered a garage and must meet the requirements
in Section R309 as well as Section 614 of this code.
|
R612.1. Design loads. Plans are required to meet the minimum
design loads noted in Table R301.2 (1). Uplift reaction forces involved
are required to be provided.
|
R612.2. Truss design drawings. Truss design drawings are required
at the time of plan submittal. The building plans should specify the
permanent bracing for cords and webs to meet the bracing requirements
shown on the truss design drawings.
|
R612.3. Size, grade, and species of wood members. All lumber
shown on the submitted drawings should identify the size, grade and
species or species group. Any engineered lumber should be identified
by the product name, size and stress grade.
|
R612.4. Isolation of siding. Methods and materials to isolate
steel siding from preservative treated lumber should be specified
26 and detailed on the submitted plans.
|
R612.5. Connection of truss carrier to bearing post. Submitted
plans shall specify a bearing notch, properly designed bearing block,
or other means for positive load transfer.
|
R612.6. Fastener schedule. Submitted plans are required to include
a fastener schedule completely describing the fasteners and quantities
required at each connection. Power-driven nails should specify the
type, diameter and length.
|
R612.7. Roofing and siding diaphragms. Submitted plans shall
include metal roof and wall panel thickness, fastener type and size,
and the fastener pattern for roof and siding panels. If stitch screws
are required to attach metal sheet-to-sheet, the plans should show
the locations. Shingled roofs shall meet the requirements of Section
R905.
|
R613.1. Footing depth. Footings for post frame structures shall
extend a minimum of 40 inches (914 mm) below grade.
|
R613.2. Footing size. Footings for all post frame structures
shall be sized to support the loads imposed. Minimum footing sizes
for all post frame structures shall be 18 inches (457 mm) diameter
and a minimum of 12 inches (203 mm) thick concrete under the support
posts.
|
R613.3. Resistance to uplift. A lumber cleat shall be attached
to the bottom of all vertical support posts to resist uplift. Exception:
Other means to resist uplift may be used and should be noted on the
submitted plans.
|
R614.1. Preservative treatment. All wood in contact with the
ground shall be preservative-treated meeting the requirements of Section
R319.
|
R614.2. Support posts. Support posts fabricated from multiple
plies shall have the number of plies of lumber, lumber species, grade,
and connection system between plies noted.
|
R614.3. Truss carrier spans. The allowable spans for truss carriers
shall support the load of the proposed roof structure and floor system
if present. Fabricated or dimensional lumber shall not exceed the
values set forth in Tables R617.4 (1) through R617.4 (3). Spans exceeding
the values set forth in Tables R617.4 (1) through R617.4 (3) shall
be engineered.
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