I may even rip those 10in boards into 3 pieces. Typical metal roofing only needs a perlin every 2ft and it definitely dosnt need to be 10in wide. It might have had wire running under the tar paper but too long ago to remember. I thought my old house, years ago, had skip sheathing with tar paper and shingles. Smaller gaps between the boards (purlins I guess) would reduce that at least. I've been thinking the stapled tar paper would keep from sagging, maybe not. If there were no spaces, tar paper would seem to be the right thing to do. You might consider a rigid foam board as thin as possible to put under the tin first. The problem with the tar paper is that it may sag between the boards or space between the purlins. I'm under the impression you will have spaces between the 1x pine boards to be used like purlins. I know this is a carport, but you may still have condensation form on the underside of the tin where it is exposed (if I understand your construction completely). Thinking it doesn't matter much once the metal roofing goes over it, or does it?Īlso thinking I'll use up the leftover rolls of tar paper I have over the sheathing. I can rip them in half and cut the spacing in half. If I use them like that, I have only enough boards for a 12" space between them. I have 1x pine boards for sheathing, and metal roofing to go over that. I have the carport I'm building out of left over lumber almost ready to sheath the roof, 10 manufactured 2x4 trusses I got free a long time ago on 4' centers. Small Cabin Forum / Cabin Construction / Skip Sheathing Forums - Register/Sign Up - Reply - Search - Statistics.
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