| 3 Layer Felt Roofing |
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There are three types of felts. One is organic. ( made of paper). The other two types are fiberglass and polyester. Felts are usually saturated with bitu-men when they are made and are installed in layers, called plies. The layers are held together with bitumen. The plies are mopped together in shingle-fashion. Shingle-fashion is when felts are over-lapped, just like shingles on a house |
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