book tile

American  

noun

1. a flat, cellular roofing tile having two parallel edges one of which is convex and the other concave, so that a number may be fit together edge to edge between rafters, joists, etc.

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Example Sentences

On this assumed watertight surface 3-in. book tile was laid with joints normal to the gutter and cemented.

From Concrete Construction Methods and Costs by Gillette, Halbert Powers