I am putting some 3/4 plywood on top of 2x6 framing joists on my flat garage roof. The framing is spaced 16oc. I figured that I place 4x8 plywood sheets in such way that their short edge will be resting on joists. The entire roof is 17 1/2' X 10 1/2' so it requires about 7 sheets total.
That brings up 2 questions:
Do I need to space sheets from each other and from concrete walls of the garage? I heard that 8d nails used as spacers between sheets work well for it.
How do I nail those edges? I mean - there would be only 3/4" (not even counting spacers) under the edge. Do I just nail so close to the edge? Will it work? Should I put nails at the edge toward the center of the joist or just straight down?