sloping ceiling; slanted ceiling
Architectural term for a ceiling that is not horizontal but inclined, often found in attics, under roofs, or in modern design.
This room has a sloping ceiling, which gives it a sense of openness.
We are considering insulation work for the sloping ceiling.
General term for ceiling; 勾配天井 specifically refers to a sloped or inclined ceiling.
Synonym also meaning sloping ceiling; 勾配天井 is more common in architectural contexts.
Compound of 勾配 (こうばい, 'slope, incline') and 天井 (てんじょう, 'ceiling'). The exact historical derivation is uncertain, but the term is straightforwardly descriptive.