| CPC E04D 1/28 (2013.01) [B32B 3/30 (2013.01); B32B 7/12 (2013.01); B32B 37/12 (2013.01); B32B 38/0004 (2013.01); B32B 38/0012 (2013.01); E04D 1/26 (2013.01); B32B 2419/06 (2013.01)] | 16 Claims |
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1. A roofing shingle, comprising:
a first layer comprising:
a headlap portion configured to be overlapped by at least one additional roofing shingle arranged in a next higher course of roofing shingles, and an exposure portion;
a second layer opposite the first layer; and
multiple groups of indentations, each group comprising:
a pair of first indentations spaced apart by a first distance and positioned along an upper surface of the first layer and extending through the first layer and at least partially into the second layer; and
a second indentation positioned along a bottom surface of the second layer between the pair of first indentations and extending through the second layer and at least partially into the first layer;
wherein at least two groups of indentations are spaced apart by a second distance that is greater than the first distance, and the multiple groups of indentations attach the first layer to the second layer.
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