平屋顶的构成方式基本上与木地板相同。若干个平顶搁栅(或屋顶搁栅)从一面墙伸向对面的墙。

Flat roofs are framed in essentially the same way AS wood floors. a number of ceiling (or roof) joists run from one wall to the opposite wall.

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屋面两坡的下方，檐口的连系梁支承在平顶搁栅之上。

At the lower end of each roof slope, eaves purlins are provided over the ceiling joists.

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