In the cold climate wall, which layer lies directly inside insulation?

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Multiple Choice

In the cold climate wall, which layer lies directly inside insulation?

Explanation:
In cold climate wall assemblies, controlling moisture diffusion is essential. The vapor barrier is placed on the warm, interior side and sits directly against the insulation, forming the first moisture-control layer as vapor tries to move inward. This positioning helps keep interior moisture from reaching the cold outer layers where it could condense and cause problem like mold or rot. The interior finish remains on the room side beyond the barrier, while exterior cladding and the wall sheathing are on the outside of the insulation. So the layer directly inside the insulation is the vapor barrier.

In cold climate wall assemblies, controlling moisture diffusion is essential. The vapor barrier is placed on the warm, interior side and sits directly against the insulation, forming the first moisture-control layer as vapor tries to move inward. This positioning helps keep interior moisture from reaching the cold outer layers where it could condense and cause problem like mold or rot. The interior finish remains on the room side beyond the barrier, while exterior cladding and the wall sheathing are on the outside of the insulation. So the layer directly inside the insulation is the vapor barrier.

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