How much is Hot Mopped Roofing (Cost) Hot mopped roofing cost vary depending on the quality and layers of roofing you are having applied. With a base sheet plus three layers you can expect from $600-$850 a square depending on installation requirements.Click to see full answer. Similarly one may ask, how much does it cost to coat a roof? Flat Roof Coating Flat roof coatings will cost between $0.15 to $2.00 per square foot for materials and an additional $0.50 to $3.00 per square foot for labor as broken down in the cost per square foot section above. This price is for a coating over a pre-existing roof system, such as a rubber membrane or metal roof.Also Know, how much does it cost for a rubber flat roof? Flat roof materials The EDPM thickness affects the price. According to CostHelper, it can cost $2.50 to $4.50 a square foot to have an EDPM rubber roof professionally installed. This would amount to about $2,250 to $4,000 for a 30-by-30-foot flat roof on a single-family home, depending on a number of factors. Then, how much does hot tar roofing cost? Tar roof costs may vary depending on the materials used, the difficulty of the installation, your location, and other factors. The cost to install a tar and gravel roof is $2.50 to $4.50 per square foot. For an average sized 1,500 square foot roof, that’s a total cost of $3,750 to $6,750.How do you hot mop a flat roof?On a sloped roof, hot mopping begins by embedding a 90Lb felt or modified bitumen cap sheet in hot asphalt. The material is back-nailed to secure it to the roof and covered by the following ply.

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