Asphalt Roof

An asphalt roof is a class of low-slope roof that consist of layers of reinforcing felt between asphalt.

A lot of old buildings with nearly-flat or flat roofs”:/flat-roof are topped with built-up roofing, made from layers of asphalt-coated roofing felt. The top layer is usually covered with rock or gravel, which serves as a ballast to hold the roofing material down and protect it from UV damage.

Built-Up Roofs are also known as Tar and Gravel roofs when coal tar is used instead of asphalt.

Typical lifespan of a built-up roof is 10 to 20 years depending on weather conditions.

The service life of a built-up roof can be extended by another 10 years with the application of an elastomeric roof coating. Elastomeric coatings have become a very popular alternative to roof replacement. They are usually white and can reflect up to 90% of the heat from the sun.

Built-Up Roofing Systems are usually installed using hot asphalt. Asphalt, although has good waterproofing characteristics, suffers from a loss of ductility after prolonged exposure to UV.

The reflectivity of BURs depends on the color of the surface layer. Four BUR surfacing options are aggregate, smooth, mineral cap, and protective coating.