Proper materials for moisture control with a SIP roof
I’m building a house north of Stowe VT using SIP over timber frame construction with R-40 walls, and R-48 to R-53 roof SIPs (different thickness are being used in order to make the ridge line heights match on roof areas with differing pitches).
There seems to be some confusion among my contractor, the SIP installers and myself about what to use for 2 parts of the roof system:
1) material to use over the top of the T&G ceiling boards and under the roof SIPs
2) material to use over the top of the roof SIPs and under the standing seam metal roof
Issues involved include moisture migration from inside to outside and water proofing from outside to inside.
Material options suggested so far are either felt paper, RoofTopGuard for #1 and those plus Ice & Water Shield for #2.
Is there any Energy Star requirement wrt these materials?
Any experiences folks might have heard from anyone having used these and/or any info about their relative merits and/or drawbacks?
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