Modified Bitumen Vs Built Up Roof

Modified bitumen displays the built in redundancy of asphalt built up as well as the uv resistance and flexibility of a modified membrane.

Modified bitumen vs built up roof. Each system is designed to waterproof the roof and protect it from sun rain snow and more. Flat roofs are one of the most popular roofing designs and yet still one of the best investments for most of the facilities. This caused the roof to underperform. You will never see actual gravel chunks of rock say 3 16 to 1 4 in size on a modified bitumen roof.

A built up roofing system is installed by alternating layers of bitumen and reinforced fabric. Built up roof bur modified bitumen and single ply. If needed a base sheet can be fastened to the roof to create a flat and safe work space. Built up roofing the first layer can be adhered directly to the roof substrate.

These roof systems are constructed with layers of felt and bitumen that provide a redundancy of durable protection. First although an app modified bitumen roof is designed to resist uv light damage blistering cracking and oxidation a lack of standards led some manufacturers to skimp on the addition of the app modifier. Conventional built up roofs bur are known to require a heavy gravel cover significantly adding to the roofing job. January 22 2019 share the wealth.

Bit cap sheet if done correctly over any single ply membrane. This prevent leaks mold and rot all of which can weaken the roofing structure and cause costly damage. Bur roof systems have been utilized for over 100 years in the roofing industry. A plain tar and gravel roof also referred to as a built up roof or bur is quite different from modified bitumen.

Built up roof membranes bur and modified bitumen mod bit are generally composed of alternating layers of bitumen and reinforcing fabrics that create a finished membrane. And roofers can pick from three commonly accepted methods of application hot asphalt heat and cold adhesive roofing installations. There are 3 main types of flat roofing systems. Modified bitumen mb roofing is an asphalt based close cousin of the built up roof bur designed for buildings with low slope or flat roof structures.

Except for the overlap at seams a modified bitumen roof is a single membrane in thickness over the roof surface. However the type of materials used for the flat roofs depends a lot on your locality. It is more durable tougher and has redundancy you don t get with a single ply. Modified bitumen is a roofing membrane consisting of asphalt and plastic or rubber polymers and is therefore widely considered an evolution of asphalt built up roofing bur.

Build up vs modified bitumen vs rubber membrane flat roofing. A single ply just offers a cleaner easier solution but without the longevity of a built up roof. Second although the gravel spread over a modified bitumen roof is intended to offer uv and hazard. Engineered modified bitumen roofing membranes originated in europe in the mid 1960 s and have been used successfully in the united states and canada since approximately 1975.