筒瓦为半圆筒形的,由筒型坯对剖制成,[1] 覆盖在仰板瓦的交界处,构成筒瓦屋顶,靠近屋檐口的筒瓦为勾头(宋代称华头筒瓦[2]),顶端粘挂有圆形瓦当

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北京四合院的筒瓦屋顶

中国宋代营造法式》规定,筒瓦共有六个品种,自六寸至二寸五分。清代普通筒瓦宽自四寸五分至二寸五分,琉璃筒瓦宽自六寸五分至三寸。[3]

筒瓦有罗锅筒瓦、花脊筒瓦等形式。

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