R505.2.6 Web Holes, Web Hole Reinforcing and Web Hole Patching
Web holes in floor joists shall comply with all of the following conditions:
- Holes shall conform to Figure R505.2.6.1.
- Holes shall be permitted only along the centerline of the web of the framing member.
- Holes shall have a center-to-center spacing of not less than 24 inches (610 mm).
- Holes shall have a web hole width not greater than 0.5 times the member depth, or 21/2 inches (64.5 mm).
- Holes shall have a web hole length not exceeding 41/2 inches (114 mm).
- Holes shall have a minimum distance between the edge of the bearing surface and the edge of the web hole of not less than 10 inches (254 mm).
Framing members with web holes not conforming to these requirements shall be reinforced in accordance with Section R505.2.6.2, patched in accordance with Section R505.2.6.3 or designed in accordance with accepted engineering practices.
Patching of web holes in floor joists not conforming to the requirements in Section R505.2.6.1 shall be permitted in accordance with either of the following methods:
- 1.1. The depth of the hole, measured across the web, exceeds 70 percent of the flat width of the web.
- 1.2. The length of the hole, measured along the web, exceeds 10 inches (254 mm) or the depth of the web, whichever is greater.
- Web holes not exceeding the dimensional requirements in Section R505.2.6.3, Item 1, shall be patched with a solid steel plate, stud section or track section in accordance with Figure 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 with minimum edge distance of 1/2 inch (12.7 mm).