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Built up roofs consists of multiple layers of roof felts laminated together with asphalt. The hot asphalt is the bonding and waterproofing agent used between the layers. The felts (polyester or fiberglass) reinforce the asphalt and prevent it from cracking. Built up roofs are typically installed as 3, 4, or 5 ply systems. But, with so many Ellisville roofing contractors who claim to be experienced, it can be difficult to sift good contractors from the bad.

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