I have not been paying attention- these are horizontal 2x4s, right? To
act as a ledger for the shelves? Or vertical 2x4s to hold brackets? On a
horizontal 2x4, you may wanna go with a wider board, to reduce the lever
action that will dig into the drywall. Back in the stone age, for
closets and utility rooms and such, I always had good luck with a pretty
1x8 band screwed into the studs, and metal brackets screwed into that
wherever needed. Held a 12" shelf, supported by the brackets and the top
edge of the 1x8, heavily loaded, with no problem.
Let's do the math. 2 x 4's are actually 1 1/2" thick some 1 5/8". Drywall
1/2", less an eighth or so for recess. That gives you about an inch of
penetration into the stud that will hold it all. I'd use them.
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