In shrine and temple buildings, straight pieces of wood called Katsuogi are placed on the ridge wood provided at the top of a roof, to press and fix the roof.
神社建築においては、屋根の最頂部にある構造材の棟木（むなぎ）の上に鰹木（かつおぎ）と呼ぶ屋根を押さえる重石の役目を担う水平材が取り付く。