[lcmelly63]

What is the length of floor joist that can be cut for a 3 inch toilet pipe without comprising the strength of the floor

 

[Gary in WA]

Welcome to the forum!

Minimum 2x10 or 2x12 is required, follow the rules, pp.2: http://arch.umd.edu/Tech/Structural...Wood_Products/Notching_&_Boring_Guide_A11.pdf

Gary