Would it be crazy to use TJI’s over old roof rafters?
We are buying a REAL fixer upper with roof problems that include falling off box gutters. It needs a new roof anyway and I had thought about foam board as we would like to use the attic space as living. Is there any major flaw to attaching 12 ” TJI’s over the rafters and using cellulose? The “sheathing” is just spaced boards which could be cut after the TJIs are installed for one cavity in each bay. This should also fix the roof line to use regular gutters too, I think. I am wondering what the drawbacks of this are, and if regular venting (baffles against the sheathing) would be sufficient.
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