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Re: Can you use I-Joists in an Attic as Rafters?
It's not too unusual to see that here, especially for the vaulted ceiling application. To get R-38, you need the depth of a TJI or similar instead of the traditional 2x12. The other advice on cuts, stiffener blocks, etc is all good. The manufacturer's instructions are what you'll need to reference.
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Jim Robinson
New Mexico, USA
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