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Modified Bitumen roof: A roof covering that is typically composed of a factory-fabricated composite sheet consisting of a copolymer-modified bitumen, often reinforced with polyester and/or fiberglass, and installed in one or more plies.
One of the most common cool roof options for a flat or low-sloped roof is a modified bitumen roof.
Base Sheet: An asphalt-impregnated, or coated felt used as the first ply in some built-up and modified bitumen roof systems.
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You can cover a flat roof with tar and gravel, modified bitumen roofing, EPDM rubber roofing, asphalt roll roofing, metal, or PVC membrane. Other factors that will affect your decision include location, climate, style, level of maintenance, and cost.
 See also: Energy, Bitumen, Asphalt, Roof, Roofing
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