| 摘要 |
PROBLEM TO BE SOLVED: To provide light and hard roofing with high weatherability and free from maintenance. SOLUTION: A plurality of hollow holes H are formed along an upstream side from a downstream side of an approximately square plate-like hard roofing A, at the same time, a cover piece 2a projected to the downstream side is formed in the end of the downstream side of a facing surface 1, and the hard roofing A is so constituted that a waterproof gutter 3b intersecting the hollow holes H in width shorter than the length of an overlap in the vertical direction of the hard roofing A and passing through up to the hollow holes H is formed on the upstream side of the facing surface 1. COPYRIGHT: (C)2003,JPO
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