Modified bitumen roofing, also known as modified bitumen membrane roofing (MBR), is a type of flat roofing system commonly used in commercial and residential construction. It is an evolution of traditional built-up roofing (BUR) systems, incorporating modern materials and technology for improved performance and durability.
Modified bitumen is a blend of asphalt/bitumen and rubber or plastic modifiers, such as styrene-butadiene-styrene (SBS) or atactic polypropylene (APP). These modifiers enhance the properties of the bitumen, making it more flexible, durable, and resistant to temperature extremes, UV radiation, and weathering.
Modified bitumen membranes are typically reinforced with either polyester or fiberglass mats to provide strength, stability, and dimensional stability. The reinforcement helps to prevent stretching, tearing, and cracking during installation and throughout the life of the roof.
Modified bitumen roofing systems can be installed using various methods, including heat welding, torch application, cold adhesive, or self-adhered membranes. Heat-welded membranes are bonded together using a hot-air gun or torch, while cold adhesive or self-adhered membranes are applied with adhesive directly to the substrate.
Modified bitumen membranes come in various surface finishes, including smooth, granulated, or mineral-surfaced. Granulated or mineral-surfaced membranes offer additional protection against UV radiation, weathering, and foot traffic, while smooth membranes provide a sleek appearance.
STATE LICENSE: CCC1334376
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