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While more expensive to install, they come with longer manufacturer's warranties, sometimes up to 50 years - typically prorated, as virtually all asphalt shingle roofs are replaced before such an expiration could be reached. While three-tab shingles typically need to be replaced after 15–18 years, Dimensional typically last 24–30 years.
In the United States, the fatal injury rate in 2021 was 59.0 per 100,000 full-time roofers, compared to the national average of 3.6 per 100,000 full-time employees. [17] According to the U.S. Bureau of Labor Statistics, roofing has been within the top 5 highest death rates of any profession for over 10 years in a row. [18]
Shingles historically were called tiles, and shingle was a term applied to wood shingles, [1] as is still mostly the case outside the US. Shingles are laid in courses, usually with each shingle offset from its neighbors. The first course is the starter course and the last being a ridge course or ridge slates for a slate roof.
Felt paper is available in several grades, the most common being Type 1—commonly called 15-pound (15#) or No. 15 (#15)—and Type 2—commonly called 30-pound (30#) or No. 30 (#30). The weight designations originated with organic base felt weighing 15 or 30 pounds per 100 sq. ft. (6.8 kg or 14 kg per 9.3 m 2 ).
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In Scandinavia shakes, traditionally used only for roofing, are generally smaller than in North America, measuring 13–16 inches (330–410 mm) long, 4–6 inches (100–150 mm) wide and 1 ⁄ 8 inch (3.2 mm) thick, [6] while in Poland and Slovakia they are usually 36 inches (910 mm) long, 4–6 inches (100–150 mm) wide and 1–1.25 inches ...