Will building paper over foil faced polyiso negate the radiant barrier?
I’m planning an exterior renovation in S.C. (hot, humid zone 3). I’ll be installing 1″ of foil faced polyiso on the exterior. I plan to seal the seams, but am considering a belt and suspenders approach to the drainage plane. I don’t know that I trust the tapes and sealants to hold up under such extreme conditions, so I’m considering installing a house wrap over the top to allow better flashing integration, especially in the area where a gable roof ties directly into the side of the home. If done this way, does the building paper have any effect on the radiant barrier, since it will not have an air space? I am planning on installing furring strips for a ventillated rain screen as well that will allow that air space.
Thanks in advance!
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