I recently had my basement framed/rocked/finished, and stupidly told the contractor to leave one small wall unfished. That decision came back to bite me as I now want to finish that wall... It's a short little wall at the bottom of my stairs thats 9' long, and just under 9' high and the contractor wants $500 to do the job. That seems way high for the amount of work to be done but I understand his reasoning in that they would need to be back so many times from start to finish, etc.
So I'm going to tackle this short little wall myself.
I want to hang the few panels of 5/8" drywall on a concrete wall without framing it ahead of time (due to timing, amount of wasted space if I were to frame it out). I have some leftover pieces of RC2 Sound Channel (typically used for sound proofing but I was told would work fine here..) that I'm planning on going directly into the concrete with. And then hanging 5/8" fire-rated drywall on it.
I'm using tapcon's to hold the RC2 to the concrete. The RC2 will give a gap of 1/2" from the concrete wall. 1/2" from the RC2 plus 5/8" drywall equals 1 1/8" total distance.
I know the rule of thumb is 1/3 of screw into material, 2/3 into the backing support, but I can't go very deep due to the concrete being 1/2 away from the back of the panel. So with 5/8" drywall will the 1" screws be sufficient to hold the panels? Should I just add more screws to compensate? Good idea? Bad idea?