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Why is a vapor barrier not required in the exterior wall assembly of an AAC wall?

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Why is a vapor barrier not required in the exterior wall assembly of an AAC wall?

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The enclosed cellular structure of AAC along with the exterior finishes provides the healthy balance between resistance to moisture penetration and vapor diffusion. This balance maintains a dry system, prevents moisture condensation and allows vapor diffusion when and if any presence of vapor occurs within the wall system.

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