also: そとかべ
noun
outer wall; exterior wall
Refers to the external wall of a building or structure.
この建物の外壁はレンガでできている。
The outer wall of this building is made of brick.
外壁の塗装が剥がれてきた。
The paint on the exterior wall has started to peel.
Standard kanji spelling; the reading がいへき is the most common.
Alternate reading; less common than がいへき.
内壁 means 'inner wall' or 'interior wall', the opposite of 外壁.
Compound of 外 (outside) and 壁 (wall).