Modified Bitumen Vs Built Up Roof

And roofers can pick from three commonly accepted methods of application hot asphalt heat and cold adhesive roofing installations.

Modified bitumen vs built up roof.

Having worked with most and specified several i can tell you i prefer a built up roof with a mod. Built up roof bur modified bitumen and single ply. It is more durable tougher and has redundancy you don t get with a single ply. Pros of the build up roof.

Conventional built up roofs bur are known to require a heavy gravel cover significantly adding to the roofing job. This is not a requirement at all for modified bitumen roofing systems. Bit cap sheet if done correctly over any single ply membrane. 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. 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. A built up roofing system is installed by alternating layers of bitumen and reinforced fabric. Except for the overlap at seams a modified bitumen roof is a single membrane in thickness over the roof surface.

These roof systems are constructed with layers of felt and bitumen that provide a redundancy of durable protection. You will never see actual gravel chunks of rock say 3 16 to 1 4 in size on a modified bitumen roof. However the type of materials used for the flat roofs depends a lot on your locality. Flat roofs are one of the most popular roofing designs and yet still one of the best investments for most of the facilities.

A plain tar and gravel roof also referred to as a built up roof or bur is quite different from modified bitumen. 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. Built up roofing the first layer can be adhered directly to the roof substrate.

A single ply just offers a cleaner easier solution but without the longevity of a built up roof. If needed a base sheet can be fastened to the roof to create a flat and safe work space. Each system is designed to waterproof the roof and protect it from sun rain snow and more. This caused the roof to underperform.

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. There are 3 main types of flat roofing systems. Modified bitumen displays the built in redundancy of asphalt built up as well as the uv resistance and flexibility of a modified membrane. 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.