| 摘要 |
A roofing system includes shingles having a front surface, a rear surface, an upper portion, and a lower portion. The lower portion is wider than the upper portion. A tongue extends from the upper portion and overlaps the lower portion, thereby defining a first groove between the tongue and the front surface of the lower portion. A return extends from an end of the lower portion opposite the upper portion, thereby defining a second groove between the return portion and the rear surface of the lower portion. |
| 主权项 |
1. A roofing shingle comprising:
a first portion having a first surface, an opposing second surface, a free end, and a second end; a second portion having a first surface, an opposing second surface, a free end, and a second end, said second end of said first portion adjacent said second end of said second portion; a tongue extending from said first portion opposite said free end of said first portion and overlying at least part of said first surface of said second portion, said tongue and said second portion cooperating to define a first groove there between; and a third portion extending from said free end of second portion, said third portion overlying at least part of said second surface of said second portion, said third portion and said second portion cooperating to define a second groove there between; said first portion further having a first width and said second portion having a second width, said second width greater than said first width, whereby said second portion defines a first tab extending beyond said first side of said first portion and a second tab extending beyond said second side of said first portion. |
