An outdoor living space is one of the most desired areas of a home. Contributing factors are a growing staycation mentality and a preference for healthy lifestyle choices. Therefore, incorporating outdoor living spaces with rooftop decks is a smart investment.
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For the past 50 years, the commercial roofing industry in North America has developed and adapted many roofing system options for low-slope buildings. Modified bitumen (mod-bit) membrane assemblies are well-suited to the Canadian climate, making the system a significant player in the commercial roofing marketplace.
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For more than two millennia, asphalt bitumen has been used as a key raw component in the construction industry. Long before the first oil refinery produced its first barrel of asphalt, builders and waterproofers used natural sources of asphalt for various applications.
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When this author joined the roofing industry toward the end of 1999, the standard for modified bitumen (mod-bit) sheets was Canadian General Standards Board (CGSB) 37-GP-56M, Membrane, Modified, Bituminous, Prefabricated, and Reinforced for Roofing; the National Building Code of Canada (NBC), along with many provincial codes, was referencing it in Sections 5 and 9.
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Over the last 40 years, the Canadian roofing market has experienced growth in product diversity, expectation, and demand. In short, there are many different acceptable systems and solutions to offer long-term rooftop service. These assemblies have been challenged to provide performance criteria beyond just keeping water out of the building.
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