Roof SIPs - Zone 4B - (Is Joe Lstiburek in the house?)
When doing an OSB roof SIP with a polyurethane core in a Zone 4B climate. If one tapes the interior seams with a building tape and uses a peel & stick Butyl membrane on the exterior OSB.
Does one still need a "cold roof" above the roof SIP?
I am under the impression that with both seams (interior and exterior) are sealed with a vapor barrier (interior tape and exterior peel & stick), one can place a standing seam metal roof directly onto the Butyl membrane & roof SIP without needing a cold roof. My concern is of course the "SIP rot" issue.
Posted Mon, 04/28/2014 - 21:42
Edited Mon, 04/28/2014 - 21:51
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