Vapor/air barrier necessary with SIPS panels and Rockwool?

I’m installing R15 Rockwool Comfortbatts in the exterior walls of a bedroom in southern New England (climate zone 5). The house was retrofitted with SIPS panels in 2009 on every exterior wall w/asphalt paper beneath. Do I need to install any kind of vapor barrier, smart membrane, foam, or anything at all in between the drywall and the insulation? I can’t seem to get a clear answer on this, only ambiguous/it depends, sometimes replies from elsewhere on the internet. Please help

Apr 22, 2025 - 01:31
 0

I’m installing R15 Rockwool Comfortbatts in the exterior walls of a bedroom in southern New England (climate zone 5).

The house was retrofitted with SIPS panels in 2009 on every exterior wall w/asphalt paper beneath.

Do I need to install any kind of vapor barrier, smart membrane, foam, or anything at all in between the drywall and the insulation?

I can’t seem to get a clear answer on this, only ambiguous/it depends, sometimes replies from elsewhere on the internet.

Please help