underlay with metal roof and spray foam

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underlay with metal roof and spray foam

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I am installing a metal roof on a 12 12 pitch over a 1" solid wood substrate I will be spray foam insulating between the 2x10 rafters under the substrate. Do I need to use an underlay beneath the metal roof or can I install the metal roof right on the wood since there will be no airspace?
Guest User
2012-08-06 20:17:04.000000
I would suggest underlayment, and building codes require it.
Todd Miller
2012-08-06 20:36:47.000000
+1 Gotta use underlayment. Also recommend that you put some underlayment or rigid foam in the rafter bays and they spray the roof. If you spray directly to the sheathing/decking, any future roof work or wood replacement will take the foam with it.
Eric Novotny
2012-08-09 08:49:15.000000