Interior rigid foam installed vertically?
My home in Santa Rosa, CA (zone 3c), has a stucco exterior and uninsulated 2×4 walls. I was hoping to make gradual improvements to the envelope as my budget allows. However, a termite problem has accelerated my schedule, at least in the bathroom, which I have now stripped down to the studs, inside and out. I would like the exterior finish to stay uniform, so I thought a good option for increasing insulation would be to use some kind of batt in the walls with 2″ or so of rigid polyiso on the interior. I saw somewhere that much of the additional insulation value is lost to thermal bridging of the plates in this instance. What I’m wondering is if the rigid insulation can be aligned vertically on 24″ centers with the 2×2 battens offset from the 2×4 studs and attached to the top and bottom plates and the drywall blocking that, in this wall anyway, is located halfway up the wall?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part