Sealing within stud bays along stairs
We have been making progress on our garage with ADU (described previously: https://www.greenbuildingadvisor.com/question/ensuring-good-air-quality-in-garage-apartment)
We have been sealing everything between the garage and apartment, including electrical and plumbing penetrations. We had the underside of the stairs spray foamed, and now realize we hadn’t thought about how to seal the stud bays that run along the side of the stairs (see pictures). There will be drywall under the stairs meeting the wall drywall. However, everywhere else we’ve put in an extra layer of sealing (sealant + xps, or close cell spray foam) in addition to drywall, so that we’re not relying on drywall with paint as the only air barrier.
Any advise on how to seal within the stud bays? As described in my other post, we have 3” of xps on the exterior, which may affect the approach.
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