Understood, I am NOT drilling through the joist, that would mean drilling more than 6" and I have drilled 2" from bottom and 2" from top and found a hollow opening from the top.DELInstallations said:What you DON'T want to do is drill straight through the double joist that is going to be boxing in each side of the stairs. Usually the cabling is angled through the bottom plate, around the joist and angled back into the stud bay below. Drilling straight through is going to take out all the meat of the joist.
Usually, it's pretty tough to get a large mass of cabling to a spot under the stairs without multiple smaller holes (3/4 or 1" max) and angling from the top plate of the wall enclosing the stairs to form a "closet" space under them and to the joist space or stud bay above.
Sounds like you've got glue-lams or TGI's in your house? If so, proceed with caution.
I think a 1/2" or 3/4" hole should be good enough for the cables I am trying to fish.
What the heck is glue-lams or TGIs? Yes, I can google but a one liner would be helpful.