looks like 2x4 walls and no tape between the Zip panels attached to the 1st and 2nd floors... pushing their luck to get R-20 on those walls... OSB remains a nightmare where we are for mold and if they aren't completely sealing the cuts on the OSB the homeowners will regret it. We have houses built with OSB 10, 20 years ago that have had mold completely eat the OSB away - to the extent a local Realtor bought a house only to find nearly all the OSB GONE....mold heaven. Haven't built anything using OSB since then.
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