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Roofing membranes in an unvented roof assembly

Tinybuilds4U | Posted in General Questions on

Hoping to get some suggestions for my unvented roof assembly in zone 4 pacific north west. Is it recommended to use vapor permeable membranes in unvented roof assemblies? Bellow as well as above rigid foam board, Or is it best to use vapor impermeable membranes? 

Thank you,

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