Sheathing between attached garage and house
New build, zone 2A. I’m using 7/16″ zip system on exterior walls of house.
I need some opinions on the best way to sheath the wall between the house and the attached garage. The wall will be insulated, probably with open cell foam, but maybe blown rockwool. My concern is getting a good air seal between the house and garage. I can use 7/16″ zip system (with zip tape) for the wall (on the garage side), but the resulting aesthetics probably won’t be acceptable. I can use OSB (painted on the garage side) and air seal it on the house side with a paint-on air sealer, or depend on the OC foam and drywall for air sealing. Any other ideas? The wall will be 2×6 studs. This is a hot, humid area.
Is it a bad idea to use zip sheathing or OSB with air sealing, and then cover it with drywall on the garage side?
Thanks.
Replies
Are you sure the 7/16 is good, or do you need the 1/2?
https://www.huberwood.com/zip-system/wall-sheathing#products
I only see a vapor transmission rating for the half inch
https://www.huberwood.com/zip-system/wall-sheathing#products
(please excuse/explain if there is a reference I can become more familar with)
have you looked at an exterior drywall? a fiberglass faced 5/8 seems like it would do the trick inside your garage, which would also provide the benefit of a fire barrier between the garage and the house.
https://gypsum.org/single-family/exterior-gypsum-sheathing/
You could put the exterior drywall on the garage side of your exterior vapor barrier surface.
I tried to include some links, but they would not let this post
exterior drywall (with fiberglass instead of paper faces) seems like the right stuff to use. you need a fire barrier between the garage and house, don't you?
On the huber site, I only see a vapor transmission spec for the half inch zip sheathing.
Yes two layers of 5/8" firecode drywall on entire party wall between House and Garage. That includes any gable wall BEFORE trusses or roof framing. Also 1 hr firerated door. This should be all included in sealed drawings/permit.