In a wood-frame exterior wall build-up, which layer is the innermost, closest to the interior?

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Multiple Choice

In a wood-frame exterior wall build-up, which layer is the innermost, closest to the interior?

Explanation:
The layer closest to the interior is the interior wall finish. In a wood-frame exterior wall, the interior wall finish (usually drywall) forms the surface you see and touch inside the room and is mounted directly on the studs. All the other components—vapor barrier, insulation, exterior sheathing, building paper or weather barrier, and the exterior siding—sit outward of that finished interior surface. So while a polyethylene vapor barrier helps control moisture, and siding and building paper protect from the outside, none are as close to the interior as the finished interior surface.

The layer closest to the interior is the interior wall finish. In a wood-frame exterior wall, the interior wall finish (usually drywall) forms the surface you see and touch inside the room and is mounted directly on the studs. All the other components—vapor barrier, insulation, exterior sheathing, building paper or weather barrier, and the exterior siding—sit outward of that finished interior surface. So while a polyethylene vapor barrier helps control moisture, and siding and building paper protect from the outside, none are as close to the interior as the finished interior surface.

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