| 摘要 |
<p>A roofing shingle (10) is formed from a square sheet metal blank. One corner (30) of the blank is provided with a pair of open ended, back to back U-shaped slots (38) transverse to a diagonal (26) passing through that corner (30). The two sides (12, 14) intersected by the slots are downwardly turned to form a small margin (12M, 14M), and the other two sides (16, 18) are upwardly turned to form a margin (16M, 18M) of similar width to the downwardly turned sides (12M, 14M). The corner is also downwardly folded above the slots (38) to form a margin (50M) of similar width to the other margins, and below the slots it is folded so as to be generally parallel to the central area (22) of the shingle. A shingle support (60) preferably of foamed sheet polystyrene is disposed on the under surface of the shingle.</p> |
