drilling joists

[quogueelectric]

Took a while to find it again but here is a pretty standard engineering alowance for notching and boring wood. http://www.ladbs.org/faq/info bulletins/building code/IB-P-BC 2002-007 Wood cutting notching.pdf

 

[Sparkyrob11]

I should clarify also, I didn't intent to make it sound like removing the middle third area of a microlam is acceptable, merely the recommended area to drill approved diameter holes.

 

[Dennis Alwon]

http://www.ladbs.org/faq/info%20bulletins/building%20code/IB-P-BC%202002-007%20Wood%20cutting%20notching.pdf

This link is for walls not ceiling joists as far as I can tell.