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Due to a diffusion-open structure, AIR House can breathe. The exterior weight-bearing structure made of massive CLT panels is equipped with thermal insulation panels. The interior side of the sandwich panel made of Steico wood fiber thermal insulation is shielded with an OSB board, the exterior side is covered by a DHF fiberboard. The interior CLT panel along with the OSB board function as a so-called vapor retarder not inhibiting vapor admission into the construction, only limiting its amount. Diffusion-open constructions are being used for hundreds of years in the form of monolayer stone, brick, clay or massive wood constructions.
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