| 摘要 |
<p>The present utility model discloses a roofing sheet defined by a unitary rectangular sheet body having a plurality of major trapezoidal ribs arranged in a spaced longitudinal manner and minor trapezoidal ribs arranged in-between said major trapezoidal ribs, said minor trapezoidal ribs consisting of a middle rib and a pair of intermediate ribs flanking said middle rib and adjacent one of said major trapezoidal ribs. The distance between the major trapezoidal rib and the intermediate rib is greater than the distance between the middle rib and the intermediate rib, such that the middle space between two major trapezoidal ribs has more strength since the distance between ribs are shorter in the middle space than near the major trapezoidal ribs.</p> |
