Modified Bitumen roofing is an asphalt-based, near relative of the Built-up-Roof (BUR) implemented for structures with minimal slope or completely flat roof structures. Engineered modified bitumen roofing membranes were originally developed in Europe in the mid 1960′s and have since been deployed with success throughout the United States and Canada since around 1975.
An advantage with Modified Bitumen roofing is the ability for increased resistance to brittleness at cold temperatures, greater flow resistance at high temperatures, and increased elasticity by mixing synthetic rubber infused polymers with asphalt instead of modification by means of the BUR asphalt system, which happens during the blowing process.
Mineral-surfaced Modified Bitumen roofing products tend to be commonly rendered with whitened granules, yet are made available in designer color styles to complement asphalt roofing shingles or even to otherwise harmonize with the structure design.
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