by Ted Cushman
Asphalt shingles have been a familiar standby for more than 100 years. Over time, they've come to dominate the steep-slope roofing market, accounting for 80% to 90% of all residential roofs. Throughout most of this century, shingles didn't change much: 1965's basic product wasn't a whole lot different from 1925's. Since the mid-1970s, however,...
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