book tile
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, or the like.
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, or the like.