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Insulation Board on Sloped Roof

We are designing a home in Santa Fe, NM with a sloped roof. The structural engineer is really pushing back on the idea of using insulation board here because he doesn't know of a good rigid product to attach the metal roof to nor proper underlayment to use. Does anyone have a product recommendation or detail they could share to help us push for this? We'll use spray foam in the roof cavity, but our energy models suggest that the rigid board is going to make a big impact since it provides a thermal break.

Asked by Heather Gayle Holdridge
Posted Tue, 12/17/2013 - 11:12

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Heather,
Q. "Does anyone have a detail they could share to help us push for this?"

A. Yes. GBA has details for metal roofing installed over rigid foam. The details are available for free to GBA subscribers (that is, GBA Pro members). Here are links to three details:

Detail drawing of metal roofing over 1 1/2 inch of rigid foam

Detail drawing of metal roofing over 3 inches of rigid foam

Detail drawing of metal roofing over 4 1/2 inches of rigid foam

Answered by Martin Holladay, GBA Advisor
Posted Tue, 12/17/2013 - 12:46
Edited Tue, 12/17/2013 - 13:06.

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