Unlicensed contracting of projects worth over a set threshold may result in stiff fines or even time in prison. In California, for example, the California Contractors State License Board licenses and monitors roofing contractors. In the United States, regulation of the roofing trade is left up to individual states. 'Living roof' systems, or rooftop landscapes, have become increasingly common in recent years in both residential and commercial applications.
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. In the past, 3-tab shingles were used nowadays, 'architectural' or 'dimensional' shingles are becoming very popular. The most common roofing material in the United States is asphalt shingles. In the United States and Canada, they're often referred to as roofing contractors. Home Improvement do it yourself electrician general contractor handyman plumber renovation roofer
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