24 Sep '11, 5pm

Green Building Q&A: Porch Insulation

This is another of those porch attic insulation interface questions-- Zone 4 - New construction A couple of attached 3 season porches are created by overhanging roofs. The roof is truss built and the area over the conditioned space will be an unvented conditioned attic insulated with spray foam. The main question is how to handle the attic space over the porches-- Due to the porches being created by the overhanging roof trusses and since the attic is unvented, it is not practical to vent the porch attic. Let me clarify, it is not possible to vent the top of the attic space through the roof with ridge vents etc. but soffit vents are possible. Since the porches are not large, the expense to bring them into the conditioned attic space is not a killer. If this option were chosen, I would continue the insulation of the underside of the roof deck with the spray foam and then cov...

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