Metal roofs are costly but more durable than other materials, lasting 30 to 80+ years. Tar and gravel roof replacement Flat metal roofing costįlat metal roofing costs $5 to $16 per square foot or $7,500 and $40,000 total. Built-up roofs, also called tar and gravel roofs, are made with layers of asphalt sheets, tar, and felt topped with rocks or gravel. Built-up felt roofing costīuilt-up roofing (BUR) costs $3.50 to $7.50 per square foot or $4,500 to $12,600 total with installation. Fiberglass roofing, also called glass-reinforced plastic (GRP), is durable, lightweight, and waterproof but is unsuitable for large roofs. Torch-down modified bitumen roofing installation Fiberglass / GRP flat roof costĪ fiberglass flat roof costs $3.50 to $7.50 per square foot installed. While heat welding is often used to apply modified bitumen and can be dangerous, many brands make self-adhesive rolls. This roof type is flexible, UV-resistant, and lasts 10 to 20 years. Modified bitumen roofing costs $4.00 to $7.50 per square foot or $4,900 to $14,600 installed. PVC is the most expensive rubber roof type but is also the most durable, lasting 20 to 30 years on average.ĮPDM rubber roofing membrane installed on residential house Modified bitumen flat roof cost Polyvinyl chloride (PVC) roofing costs $5 to $12 per square foot with installation. Thermoplastic polyolefin (TPO) is a blend of plastic and rubber and lasts 10 to 25 years. TPO roofing costs $4 to $10 per square foot or $7,700 to $14,000 total installed. Ethylene propylene diene monomer (EPDM), a recyclable rubber, is the cheapest membrane roof option and lasts 15 to 20 years on average. The most common flat rubber roof types are EPDM, TPO, and PVC:ĮPDM roofing costs $4 to $10 per square foot or $6,200 to $16,000 with installation.
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