Felt vs synthetic
I built my house using Zip roof sheathing and Zip wall sheathing.
The makers of Zip panels say that an underlayment for the roof and that a house wrap or felt for the walls is not necessary.
The Zip roof sheathing withstood the weather fairly well for the 6 months before I got the metal roofing on.
However, heeding advice from roofers, I did install a synthetic underlayment just before putting on the metal roofing.
On the walls, I was also considering putting on a layer of the same synthetic underlayment before hanging the vinyl siding.
But I have been told that I should use felt instead because the syn. can’t absorb trapped water nor pass through vapor like the felt can.
So my questions are these:
Should I go ahead and put felt over the Zip wall sheathing (maybe at least one layer of 15# felt) or should I just install the vinyl siding directly over the Zip panels ?
Am I ok on the roofing underlayment, or should I have used felt instead of synthetic ?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part