I'm thinking of using G-P "Plytanium Dryply" as roof sheathing. This
roof has an 'open' overhang, where the underside of the sheathing is
exposed. The plywood would be installed with the coated (red) side
down. My question is whether this will take (and hold) paint.
I like this idea a lot. Do the bottom X feet of the roof in real wood
(but I would go 5/4, even if I had to notch the rafter tails to make the
roof lay flat), since the bottom can breathe, and then do the attic part
in something cheap and moisture-resistant. Back in the 60s and early
70s, my old man did a lot of California-style flying wing houses with 2x
T&G roof decking that was also the inside ceiling, with fiber insulation
above under a built-up roof, but that wouldn't fly with the heating
costs today. You'd have to do a foot thick roof system with layers of
foam, like a commercial building.
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