I am insulating and finishing an attic space. The sloping roof rafters are 24 inches on center. Between the rafters, I will be placing rafter vents and insulation, and then sheetrock over that.
My question is about the thickness of sheetrock that I need to use. I think that 1/2-inch sheetrock is probably too thin for rafters that are 24 inches on center and would tend to sag.
One option is to use 5/8-inch sheetrock.
Another option is to double-rock it with two layers of 1/2-inch sheetrock.
Any suggestions as to what would be the best way to go with this? -- 5/8-inch, double 1/2-inch, something else?