4 Layer Built Up Roofing

They can also be used in combination with modified bitumen.

4 layer built up roofing. Built up roofs or burs also called a tar and gravel roof is a well established and popular style of flat roof that is made up of alternating layers of roofing felt or fiberglass and asphalt that is applied with heat which combine to make a long lasting sturdy roofing system. This combination results in a finished membrane. A built up roof for example will typically include the built up membrane itself with or without gravel as well as some kind of insulation and cover board which will vary in thickness from roof to roof. We pioneered built up roofing systems in america more than 160 years ago.

Arma defines a built up roofing system as a roof where multiple layers of asphalt alternated with ply sheets felts are applied over the roof deck vapor retarder and most often over insulation that is attached to the roof decking. Property managers can choose three four or five ply roofs to meet their needs and budgets. The last layer is rock or stone this layer protects the underlying layers from uv rays extreme heat or cold and wind damage. Learn about the variety of installation methods and roofing system options including bur built up roof sbs and app.

It is composed of alternating layers of reinforcing fabric and bitumen asphalt and is finished with a top layer of aggregate such as stone or gravel. As a result we have long lasting durable and worry free systems. Built up roof bur systems. Typical wall construction would include a cant strip a backer layer that starts about 4 inches out on the membrane up the cant and 8 to 12 inches up the vertical wall or curb see fig.

Asphaltic roofing solutions 101 asphalt is one of the oldest roofing technologies still in use today and it is a reliable solution for both residential and commercial roofing needs. The three types of bitumen material used most commonly in built up. Built up roofing also called bur is the most common roofing material used on low slope roofs. Built up roof membranes bur have been in use on united states houses for over a century.

When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary. Why is a built up roof considered a multi ply roof. This backer layer may consist of a ply sheet or special base sheet and is followed by a mb flashing sheet generally one with a mineral granule. Ply iv 4 and ply vi 6 felts offer excellent durability and ease of application when.

The redundant layers give roofs exceptional resistance to water and weather. Iv 4 and ply vi 6 asphalt impregnated glass fiber mat reinforced roofing felts that can be installed in multiple layers with a flood coat and aggregate.