Page 150 - ICC IEBC 2018

APPENDIX C

For SI: 1 inch = 25.4 mm.
[BS] FIGURE C103.5.3
FASTENER SPACINGS FOR LUMBER-TO-LUMBER CONNECTIONS OPERATING IN SHEAR PARALLEL TO GRAIN

4. The distance between fasteners perpendicular to C103.5.3.1, fasteners shall be permitted to be
the grain (center-to-center) in lumber that is less spaced according to the fastener holes fabricated
1
than 3 / inches (89 mm) deep in the direction of into the strap.
2
the fastener length shall be 1 inch (25 mm). 3. Fasteners in metal nail plates shall be spaced not
1
5. The distance between fasteners perpendicular to less than / inch (12.7 mm) perpendicular to
2
1
the grain (center-to-center) in lumber that is more grain and not less than 1 / inches (38 mm) paral-
2
than 2 inches (51 mm) thick in the direction of lel to grain.
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the fastener length shall be / inch (12.7 mm).
2
[BS] C103.5.3.2 Wood-to-wood connections of two
members each 2 inches or less in thickness. Wood- SECTION C104
to-wood connections fastener spacing shall meet the RETROFITTING GABLE END WALLS
following conditions. TO ENHANCE WIND RESISTANCE
[BS] C104.1 General. These prescriptive methods of retrofit-
1. The distance between fasteners parallel to grain
1
(center-to-center) shall be not less than 2 / ting are intended to increase the resistance of existing gable
2
inches (64 mm). end construction for out-of-plane wind loads resulting from
high-wind events. The ceiling diaphragm shall be comprised
2. The distance between fasteners across grain (cen- of minimum / -inch-thick (12.7 mm) gypsum board, mini-
1
2
ter-to-center) shall be not less than 1 inch (25 mum nominal / -inch-thick (9.5 mm) wood structural panels,
3
mm). 8
or plaster. An overview isometric drawing of one type of
3. For wood-to-wood connections of lumber at right gable end retrofit to improve wind resistance is shown in Fig-
1
angles, fasteners shall be spaced not less than 2 / 2 ure C104.1.
inches (64 mm) parallel to the grain and 1 inch [BS] C104.2 Horizontal braces. Horizontal braces shall be
(25 mm) perpendicular to the grain in any direc- installed perpendicular to the roof and ceiling framing mem-
tion.
bers at the location of each existing gable end stud greater
[BS] C103.5.3.3 Metal connectors for wood-to-wood than 3 feet (91 cm) in length. Unless it is adjacent to an omit-
connections. Metal connectors for wood-to-wood con- ted horizontal brace location, horizontal braces shall be mini-
nections shall meet the following conditions. mum 2-inch by 4-inch (38 mm by 89 mm) dimensional
1. Fastener spacing to edge or ends of lumber shall lumber as defined in Section C103.3. A single horizontal
be as dictated by the prefabricated holes in the brace is required at the top and bottom of each gable end stud
connectors and the connectors shall be installed for Retrofit Configuration A, B, or C. Two horizontal braces
in a configuration that is similar to that shown by are required at the top and bottom of each gable end stud for
the connector manufacturer. Retrofit Configuration D. Maximum heights of gable end wall
1
2. Fasteners in 1 / -inch-wide (32 mm) metal straps studs and associated retrofit studs for each Retrofit Configura-
4
that are installed on the narrow face of lumber tion shall not exceed the values listed in Table C104.2. Hori-
1
shall be a minimum / inch (6.4 mm) from either zontal braces shall be oriented with their wide faces across the
4
edge of the lumber. Consistent with Section roof or ceiling framing members, be fastened to not fewer
2018 INTERNATIONAL EXISTING BUILDING CODE ® 131
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