Engineered Lumber

I have unsuccessfully been trying to find documentation of acceptable ways to attach electrical boxes and to staple wire to wood I-joists. Georgia Pacific doesn’t answer the phone. Weyerhauser admitted they have no instructions and said you shouldn’t nail into the flange but you can screw into it but you’d probably be better off nailing blocking between two joists through the web and leave the flange alone. Then attach ceiling boxes to the blocking. I’d like to know how inspectors decide if a box has been attached satisfactorily.

First what type of ceiling material are you using and how were going to attache it?

I am presently working on exposed I-joists. Owner may or may not install ceiling material at a later date.


Don’t know if this is I joist manufacturer approved or not but it passed all AHJ code inspections

Anything that damages the flange is an issue.

I have seen idiots damage a 2x12 with a nail gun… etc.

Hi…i am new here. I think it also called composite wood, man-made wood, or manufactured board, includes a range of derivative wood products which are manufactured by binding or fixing the strands, particles, fibers, or veneers or boards of wood, together with adhesives, or other methods of fixation to form composite materials