Notwithstanding the provisions of section 25.03.01 of this article, section R503.2.4 is added to the Residential Code to read as follows:
R503.2.4 Openings in horizontal diaphragms. Openings in horizontal diaphragms with a dimension perpendicular to the joist that is greater than 4 feet (1.2 m) shall be constructed in accordance with Figure R503.2.4.
a. Blockings shall be provided beyond headers.
b. Metal ties not less than 0.058 inch [1.47 mm (16 galvanized gage)] by 1.5 inches (38 mm) wide with eight 16d common nails on each side of the header-joist intersection. The metal ties shall have a minimum yield of 33,000 psi (227 MPa).
c. Openings in diaphragms shall be further limited in accordance with Section R301.2.2.2.5.
FIGURE R503.2.4
OPENINGS IN HORIZONTAL DIAPHRAGMS
(Ord. 0-19-1357, 11-13-2019)
Notwithstanding the provisions of section 25.03.01 of this article, lines 37 and 38 of table R602.3(1) of the Residential Code are amended to read as follows:
TABLE R602.3(1) - continued
FASTENER SCHEDULE FOR STRUCTURAL MEMBERS
ITEM | DESCRIPTION OF BUILDING MATERIALS | DESCRIPTION OF FASTENERb, c, e | SPACING OF FASTENERS | |
Edges (inches)i | Intermediate supportsc, e (inches) | |||
ITEM | DESCRIPTION OF BUILDING MATERIALS | DESCRIPTION OF FASTENERb, c, e | SPACING OF FASTENERS | |
Edges (inches)i | Intermediate supportsc, e (inches) | |||
Wood structural panels, subfloor, roof and interior walls sheathing to framing and particleboard wall sheathing to framing | ||||
32 | 3/8" - ½" | 6d common (2" x 0.113") nail (subfloor wall)j 8d common (2-1/2" x 0.131") nail (roof)f | 6 | 12g |
33 | 19/32" - 1" | 8d common nail (2-1/2" x 0.131") | 6 | 12g |
34 | 1-1/8" - 1-1/4" | 10d common (3" x 0.148") nail or 8d (2-1/2" x 0.131") deformed nail | 6 | 12 |
Other wall sheathingh | ||||
35 | ½" structural cellulosic fiberboard sheathing | 1-1/2" galvanized roofing nail, 7/16" crown or 1" crown staple 16 ga., 1-1/4" long | 3 | 6 |
36 | 25/32" structural cellulosic fiberboard sheathing | 1-3/4" galvanized roofing nail, 7/16" crown or 1": crown staple 16 ga., 1-1/2" long | 3 | 6 |
37k | ½" gypsum sheathingd | 1-1/2" galvanized roofing nail; staple galvanized, 1-1/2" long; 1-1/4 screws, Type W or S | 7 | 7 |
38k | 5/8" gypsum sheathing | 1-3/4" galvanized roofing nail; staple galvanized, 1-5/8" long; 1-5/8 screws, Type W or S | 7 | 7 |
Wood structural panels, combination subfloor underlayment to framing | ||||
39 | 3/4" and less | 6d deformed (2" x 0.120") nail or 8d common (2-1/2" x 0.131") nail | 6 | 12 |
40 | 7/8" - 1" | 8d common (2-1/2" x 0.131") nail or 8d deformed (2-1/2" x 0.120") nail | 6 | 12 |
41 | 1-1/8" - 1-1/4" | 10d common (3" x 0.148") nail or 8d deformed (2-1/2" x 0.120") nail | 6 | 12 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s; 1 Ksi = 6.895 MPa.
a. All nails arc smooth-common, box or deformed shanks except where otherwise stated. Nails used for framing and sheathing connections shall have minimum average bending yield strengths as shown: 80 ksi for shank diameter of 0.192 inch (20d common nail), 90 ksi for shank diameters larger than 0.142 inch but not larger than 0.177 inch, and 100 ksi for shank diameters of 0.142 inch or less.
b. Staples are 16 gage wire and have a minimum 7/6-inch on diameter crown width.
c. Nails shall be spaced at not more than 6 inches on center at all supports where spans are 48 inches or greater.
d. Four-foot by 8-fool or 4-foot by 9-foot panels shall be applied vertically.
e. Spacing of fasteners not included in this table shall be based on Table R602.3(2).
f. For regions having basic wind speed of 110 mph or greater, 8d deformed (2'/2"x 0.120) nails shall be used for attaching plywood and wood structural panel roof sheathing to framing within minimum 4S-inch distance from gable end walls, if mean roof height is more than 25 feet, up to 35 feet maximum.
g. For regions having bask wind speed of 100 mph or less, nails for attaching wood structural panel roof sheathing to gable end wall framing shall be spaced 6 inches on center. When basic wind speed is greater than 100 mph, nails for attaching panel roof sheathing to intermediate supports shall be spaced 6 inches on center for minimum 48-inch distance from ridges, eaves and gable end walls; and 4 inches on center to gable end wall framing.
h. Gypsum sheathing shall conform to ASTM C 1396 and shall be installed in accordance with GA 253. Fiberboard sheathing shall conform to ASTM C 208.
i. Spacing of fasteners on floor sheathing panel edges applies to panel edges supported by framing members and required blocking and at all floor perimeters only. Spacing of fasteners on roof sheathing panel edges applies to panel edges supported by framing members and required blocking. Blocking of roof or floor sheathing panel edges perpendicular to the framing members need not be provided except as required by other provisions of this code. Floor perimeter shall be supported by framing members or solid blocking.
j. Where a rafter is fastened to an adjacent parallel ceiling joist in accordance with this schedule, provide two toe nails on one side of the rafter and toe nails from the ceiling joist to top plate in accordance with this schedule. The toe nail on the opposite side of the rafter shall not be required.
K. Use of staples in braced wa9 panels snail be prohibited in Seismic Design Category D0, D1, or D2.
(Ord. 0-19-1357, 11-13-2019)