Page 439 - 2018_IRC

ROOF-CEILING CONSTRUCTION

R804.2.5 Fastening requirements. Screws for steel-to- with Section R804.2.6.2, patched in accordance with
steel connections shall be installed with a minimum edge Section R804.2.6.3 or designed in accordance with
1
distance and center-to-center spacing of / inch (12.7 accepted engineering practices.
2
mm), shall be self-drilling tapping and shall conform to R804.2.6.2 Web hole reinforcing. Reinforcement of
ASTM C1513. Structural sheathing shall be attached to web holes in ceiling joists not conforming to the
cold-formed steel roof rafters with minimum No. 8 self- requirements of Section R804.2.6.1 shall be permitted
drilling tapping screws that conform to ASTM C1513. if the hole is located fully within the center 40 percent
Screws for attaching structural sheathing to cold-formed of the span and the depth and length of the hole do not
steel roof framing shall have a minimum head diameter of exceed 65 percent of the flat width of the web. The
0.292 inch (7.4 mm) with countersunk heads and shall be reinforcing shall be a steel plate or C-shaped section
installed with a minimum edge distance of / inch (9.5 with a hole that does not exceed the web hole size lim-
3
8
mm). Gypsum board ceilings shall be attached to cold- itations of Section R804.2.6.1 for the member being
formed steel joists with minimum No. 6 screws conform- reinforced. The steel reinforcing shall be the same
ing to ASTM C954 or ASTM C1513 with a bugle-head thickness as the receiving member and shall extend not
style and shall be installed in accordance with Section less than 1 inch (25 mm) beyond all edges of the hole.
R805. For all connections, screws shall extend through the The steel reinforcing shall be fastened to the web of the
steel not fewer than three exposed threads. Fasteners shall receiving member with No. 8 screws spaced not greater
have rust-inhibitive coating suitable for the installation in than 1 inch (25 mm) center to center along the edges of
which they are being used, or be manufactured from mate- the patch with minimum edge distance of / inch (12.7
1
rial not susceptible to corrosion. mm). 2
R804.2.6 Web holes, web hole reinforcing and web hole R804.2.6.3 Hole patching. Patching of web holes in
patching. Web holes, web hole reinforcing and web hole roof framing members not conforming to the require-
patching shall be in accordance with this section. ments in Section R804.2.6.1 shall be permitted in
R804.2.6.1 Web holes. Web holes in roof framing accordance with either of the following methods:
members shall comply with all of the following condi- 1. Framing members shall be replaced or designed
tions: in accordance with accepted engineering prac-
1. Holes shall conform to Figure R804.2.6.1. tices where web holes exceed either of the fol-
2. Holes shall be permitted only along the centerline lowing size limits:
of the web of the framing member. 1.1. The depth of the hole, measured across
3. Center-to-center spacing of holes shall be not less the web, exceeds 70 percent of the flat
than 24 inches (610 mm). width of the web.
4. The web hole width shall be not greater than one- 1.2. The length of the hole measured along
half the member depth, or 2 / inches (64 mm). the web, exceeds 10 inches (254 mm) or
1
2
the depth of the web, whichever is
5. Holes shall have a web hole length not exceeding greater.
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4 / inches (114 mm). 2. Web holes not exceeding the dimensional require-
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6. The minimum distance between the edge of the ments in Section R804.2.6.3, Item 1, shall be
bearing surface and the edge of the web hole shall patched with a solid steel plate, stud section or track
be not less than 10 inches (254 mm). section in accordance with Figure R804.2.6.3. The
Framing members with web holes not conforming steel patch shall, as a minimum, be the same thick-
to Items 1 though 6 shall be reinforced in accordance ness as the receiving member and shall extend not

C.L. C.L.
24″ MIN. 10″ MIN.

4½″ 4½″ CENTERLINE OF WEB
MAX. MAX.
2½″ MAX.
BEARING CONDITION

For SI: 1 inch = 25.4 mm.
FIGURE R804.2.6.1
ROOF FRAMING MEMBER WEB HOLES

414 2018 INTERNATIONAL RESIDENTIAL CODE ®
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