Page 174 - 2018_IRC

FLOORS

C.L. C.L.
24 IN. MIN. 10 IN. MIN.

1
1
4 / IN. 4 / IN. CENTERLINE OF WEB
2
2
MAX. MAX.
1
2 / IN. MAX.
2
BEARING CONDITION
For SI: 1 inch = 25.4 mm.
FIGURE R505.2.6.1
FLOOR JOIST WEB HOLES

R505.2.6.3 Hole patching. Patching of web holes in R505.3.1(5) or R505.3.1(6). Anchor bolts shall be located
floor joists not conforming to the requirements in Sec- not more than 12 inches (305 mm) from corners or the ter-
tion R505.2.6.1 shall be permitted in accordance with mination of bottom tracks. Continuous cold-formed steel
either of the following methods: joists supported by interior load-bearing walls shall be
1. Framing members shall be replaced or designed constructed in accordance with Figure R505.3.1(7).
in accordance with accepted engineering prac- Lapped cold-formed steel joists shall be constructed in
tices where web holes exceed the following size accordance with Figure R505.3.1(8). End floor joists con-
limits: structed on foundation walls parallel to the joist span shall
be doubled unless a C-shaped bearing stiffener, sized in
1.1. The depth of the hole, measured across accordance with Section R505.3.4, is installed web-to-web
the web, exceeds 70 percent of the flat with the floor joist beneath each supported wall stud, as
width of the web. shown in Figure R505.3.1(9). Fastening of cold-formed
1.2. The length of the hole, measured along steel joists to other framing members shall be in accor-
the web, exceeds 10 inches (254 mm) or dance with Section R505.2.5 and Table R505.3.1(2).
the depth of the web, whichever is
greater. JOIST
2. Web holes not exceeding the dimensional require-
ments in Section R505.2.6.3, Item 1, shall be SOLID STEEL PLATE,
patched with a solid steel plate, stud section or C-SHAPED OR TRACK,
track section in accordance with Figure MIN. THICKNESS AS
JOIST
R505.2.6.3. The steel patch shall, as a minimum,
be of the same thickness as the receiving member
and shall extend not less than 1 inch (25 mm)
beyond all edges of the hole. The steel patch shall
be fastened to the web of the receiving member
with No. 8 screws spaced not more than 1 inch (25
mm) center-to-center along the edges of the patch
1
with minimum edge distance of / inch (12.7 mm).
2
R505.3 Floor construction. Cold-formed steel floors shall NO. 8 SCREWS
SPACED AT 1 IN. O.C.
be constructed in accordance with this section. (TYP.)
R505.3.1 Floor-to-foundation or load-bearing wall con-
nections. Cold-formed steel-framed floors shall be
anchored to foundations, wood sills or load-bearing walls
in accordance with Table R505.3.1(1) and Figure For SI: 1 inch = 25.4 mm.
R505.3.1(1), R505.3.1(2), R505.3.1(3), R505.3.1(4),
FIGURE R505.2.6.3
FLOOR JOIST WEB HOLE PATCH

2018 INTERNATIONAL RESIDENTIAL CODE ® 149
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