EPS as a water-resistive barrier (WRB) and air barrier?
I plan to build using rough cut 2×6 studs. I plan to sheath it with 2.5” R10 EPS, covered with 30 lb felt. The asphalt felt will be tacked down with 3/8 verticle shims over each 16” oc stud to create an air gap, then horizontal strapping to attach board and baton rough cut cedar as siding. interrior side will have let in corner bracing to prevent racking, 475 intellos membrane with dense pack in the stud bays.
My question is what is the best, most resilliant way to air seal the EPS joints? Tape? Spray foam? A mesh tape with a fluid applied barrier? What sticks well to EPS and stays flexible over the long haul?
Also, I have wondered if asphalt driveway sealing products (crack sealing viscous liquid and the more fluid surface sealer) have ever been experimented with as an inexpensive wrb and air barrier?
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