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在明、清官式建筑的屋顶作法中,灰背(包括泥背)作法是整个屋顶作法中关键的一环。灰背顶可以满足举势小于“二·五”举的屋顶防水要求,并能满足屋顶水流方向发生改变时的防水要求,因此灰背作法是解决平台屋顶以及天沟等部位防水问题的主要措施。瓦顶之所以具有较强的防水性能,是因为它是由瓦面和灰背复合而成的屋顶。瓦面具有一定的硬度,足以抵抗雨水的冲砸,可以疏导大量的雨水。但布瓦(青瓦)的吸水性很强,因此很难抵御
In the roof practices of Ming and Qing official buildings, the grey back (including mud back) practice is a key part of the entire roof practice. The gray back can meet the requirement of less than the “25” lift of the roof waterproofing, and can meet the waterproof requirements when the roof flow direction changes, so the gray back is to solve the waterproof problem of the platform roof and the gutter and other parts The main measure. The reason why tile roof has strong waterproof performance is because it is a tile roof and gray back composite roof. The tile surface has a certain degree of hardness, enough to resist the impact of rain, can ease a lot of rain. But Boo (blue tile) is very absorbent and therefore hard to resist