Substitute for ZIP R
I’m working on a project of several structures in climate zone 7 where ZIP R-6 has been installed on everything enclosed currently – however the builder is having trouble sourcing more ZIP R and is proposing an alternate assembly to keep closer to schedule. They have proposed putting a different integrated sheathing (i.e. Advantech, OSB with wrap, or similar) over 1″ rigid. While this approach is similar to their current assembly, it seems like it may be best to change course to a more standard rigid over sheathing? This would change some of the cladding attachments, but wondering if there are any other considerations I am overlooking.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part