On Thu, 6 May 2021 10:04:07 -0500, Leon lcb11211@swbelldotnet wrote:

On 5/5/2021 3:45 PM, jboisver wrote:
A good rule of thumb is that the screw should drive through to about
half the thickness of the bottom piece. So a 1" thick piece being
screwed to a 2" thick piece should have a 2" screw.



Actually the rule of thumb is close to 2/3's of the thickness of the
bottom piece plus the thickness of the top piece.

OK, again assuming the 6" wall and 1/2" sheetrock, you're going to use
4-1/2" screws? The electrician and plumber aren't going to like you.

1" on to 2", use a 2.25 ~ 2.5" screw.

In normal measurements where the 1x is 3/4" and the 2x is 1.5" use a
1.75" screw.