Are multiple layers of housewrap any benefit or harm?
I am in zone 4a.
I recently acquired a BUNCH of typar housewrap.
Is there any benefit, harm if I use multiple layers of housewrap?
Currently, I will air seal OSB on my stud wall, then place 3.5″ of Polyiso outside of the OSB and cover the polyiso with the housewrap, then rainscreen and siding.
However, I was thinking why not put a layer of housewrap over the OSB and then another layer over the polyiso as it will cost no money and little time.
Thank you for your advice.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part