main roof; housetop
Refers to the primary roof of a building, often contrasted with smaller subsidiary roofs (小屋根).
See also: 小屋根
大屋根の上にソーラーパネルを設置した。
We installed solar panels on the main roof.
この寺の大屋根はとても立派だ。
The main roof of this temple is very impressive.
Compound of 大 (おお, 'large, main') and 屋根 (やね, 'roof').