Residential · IRC 2021 §R502.8 / §R502.8.1
Floor Joist Notching and Drilling
Sawn joist limits: notches 1/6 depth and 1/3 depth long, none in the middle third, 1/4 depth at ends; holes 1/3 depth, 2 in from edges, other holes and notches.. Referenced to IRC 2021 §R502.8 / §R502.8.1.
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