| 摘要 |
A shingle blank is provided including a substrate coated with an asphalt coating and including a first fold region, a second fold region, a third region, a lower edge and an upper edge. The shingle blank has a length. The first fold region extends substantially across the length of the shingle blank. The second fold region extends substantially across the length of the shingle blank and is positioned between the first fold region and the third region. A first perforation line is positioned between the second fold region and the third region. A second perforation line is positioned between the first fold region and the second fold region. The first and second perforation lines are sufficient to facilitate folding of the first fold region and the second fold region on top of the third region to form a three layered stack configured to be applied across a ridge or hip.
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