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Holes in joists

R

Raywesebaum

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Joined
Sep 14, 2021
Messages
12
Location
Petersburg, Alaska
I am aware of holes being drilled in floor joists. Must be 2" from the top and bottom and only 1/3 the D of the board and in the center half of the board. I cannot find anything stating how many holes I can have and how far away.
 
2" away from any other holes per the text in 502.8.1.

As for how many holes you can drill... there is no limit in the code.
 
R502.8.1 Sawn lumber. Notches in solid lumber joists, rafters and beams shall not exceed one-sixth of the depth of the member, shall not be longer than one-third of the depth of the member and shall not be located in the middle one-third of the span. Notches at the ends of the member shall not exceed one-fourth the depth of the member. The tension side of members 4 inches or greater in nominal thickness shall not be notched except at the ends of the members. The diameter of holes bored or cut into members shall not exceed one-third the depth of the member. Holes shall not be closer than 2 inches to the top or bottom of the member, or to any other hole located in the member. Where the member is notched, the hole shall not be closer than 2 inches to the notch.
 
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