Which statement correctly describes the first layer from inside in the wood frame exterior wall build-up?

Which statement correctly describes the first layer from inside in the wood frame exterior wall build-up?

• A. The interior wall finish is the first layer from inside the wall build-up.
• B. The exterior siding is the second layer from inside.
• C. The insulation is on the outside of the wood frame.
• D. The plywood sheathing is outside building paper.

Answer: (A)

From inside moving outward, the first layer you encounter on a wood-frame exterior wall is the interior wall finish—typically drywall or plaster—applied directly to the inside face of the studs. This is the layer that forms the finished interior surface and is the first material in the wall assembly when looking from within the building. The other statements don’t fit the usual order: exterior siding is far outside the structure, insulation sits inside the cavity between the studs, and building paper (house wrap) is outside the sheathing, not inside it (with plywood sheathing preceding the building paper).

From inside moving outward, the first layer you encounter on a wood-frame exterior wall is the interior wall finish—typically drywall or plaster—applied directly to the inside face of the studs. This is the layer that forms the finished interior surface and is the first material in the wall assembly when looking from within the building. The other statements don’t fit the usual order: exterior siding is far outside the structure, insulation sits inside the cavity between the studs, and building paper (house wrap) is outside the sheathing, not inside it (with plywood sheathing preceding the building paper).