I am looking for construction details on a deck-style roof where t&g is laid over the rafters to become the finished ceiling inside. 2×4 sleepers are laid on top of the t&g to create a space for ridgid insulation then plywood and shingles follow. I’m specifically wondering how far apart I can go with the rafters if I use 1x t&g (My guess is 24″) and how far I can go with 2x t&g (My guess is 48″)and if the ridge would need to be engineered. This is for a 20×24 cottage in Massachusetts and I’ll probably put a 12/12 pitch on. Any suggestions or resources any one is aware of? Thanks in advance.
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