New builder Evan here with my tiny 8×10 cabin in Vermont. Been building for 4 months and without you all I never would have been able to get this far! Thank you so much for your support.

We are ready to order and install our interior wall material. Currently the wall assembly is: vinyl siding, Tyvek WRB with seams Tyvek taped, 1.5″ foam board insulation with seams DOW weathermate taped, OSB sheathing with seams 3M all weather taped, 2×4 studs with kraft faced fiberglass insulation.

I’ve been planning to use the airtight drywall approach with mold resistant drywall given the small cabin’s likelihood of high humidity and for an air barrier interior of the fiberglass. However friends on a tiny house forum are recommending plywood or pine boards as better alternatives than drywall, which can crack when the cabin is moved (only once or twice in it’s lifetime – not on wheels). My understanding is that going with an alternative interior wall material would require a separate air barrier like Membrain, but most of the tiny house folks I speak with aren’t familiar with air barriers at all. I’ve reread some of the GBA articles on air barriers (like “one air barrier or two?”) and it seems like one exterior air barrier might be sufficient. Can you all help steer me in the right direction? Should I still go with drywall as an interior air barrier or are the taped exterior barriers sufficient in my case? Thank you! Evan