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Home Improvement do it yourself electrician general contractor handyman plumber renovation roofer In the United States and Canada, they're often referred to as roofing contractors. The most common roofing material in the United States is asphalt shingles. In the past, 3-tab shingles were used; nowadays, 'architectural' or 'dimensional' shingles are becoming very popular. Depending on the region, other commonly applied roofing materials installed by roofers include concrete tiles, clay tiles, natural or synthetic slate, single-ply (Primarily EPDM or Rubber, PVC, or TPO), rubber shingles (made from recycled tires), glass, metal panels or shingles, wood shakes or shingles, liquid-applied, hot asphalt/rubber, foam, thatch, solar tiles, and specialty roofs like Duro-Last. 'Living roof' systems, or rooftop landscapes, have become increasingly common in recent years in both residential and commercial applications.
In the United States, regulation of the roofing trade is left up to individual states. In California, for example, the California Contractors State License Board licenses and monitors roofing contractors. Unlicensed contracting of projects worth over a set threshold may result in stiff fines or even time in prison.