In the cold climate wall assembly, which layer lies immediately outside the insulation?

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Multiple Choice

In the cold climate wall assembly, which layer lies immediately outside the insulation?

Explanation:
In a cold climate wall, insulation fills the cavity between the interior and exterior surfaces. The layer immediately outside that insulation is the exterior sheathing, typically plywood or OSB, which provides structural support and forms the base for the weather barrier and cladding. The vapor barrier is placed on the warm side of the insulation (toward the interior) to control moisture diffusion, and the interior finish sits on the inside, with the cladding on the far exterior. So the outside layer directly adjacent to the insulation is the exterior sheathing.

In a cold climate wall, insulation fills the cavity between the interior and exterior surfaces. The layer immediately outside that insulation is the exterior sheathing, typically plywood or OSB, which provides structural support and forms the base for the weather barrier and cladding. The vapor barrier is placed on the warm side of the insulation (toward the interior) to control moisture diffusion, and the interior finish sits on the inside, with the cladding on the far exterior. So the outside layer directly adjacent to the insulation is the exterior sheathing.

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