| 摘要 |
PROBLEM TO BE SOLVED: To completely prevent rainwater from intruding beneath a roof panel. SOLUTION: This metallic roof panel A has a rightward extension 2 formed on the right side of a rectangular and flat roof panel body 1 and folded back upward at the point spaced outwardly from the right side edge of the roof panel body; a double part located outward of the right side edge of the roof panel body is downwardly protrusively bent into a V-shaped cross section to form a draining groove 3, and a folded part located inward of the right side edge of the roof panel body is formed into an upper hook part 4 for a seam joint.
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