Built-up Roofing Manufacturers List & Website Directory

By Roof Online Staff • Last updated March 30, 2023

To learn more about built-up roofing, see our Built-up Roofs (BUR) page.

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Roofing asphalt being applied to a built-up roof: Hot mopping in the field of the roof.
Installing a built-up roof

Built-up roof (BUR) systems were the single most common type of flat or low-slope roofing throughout the 20th century. Today, they only make up around 2% of new low-slope roof installations, having been almost completely replaced by various types of single-ply membranes.

Although single-ply membranes are cheaper and easier to install, BUR is still an excellent and effective roof system that performs better than single ply roofing on a few different roofing metrics.

BUR is composed of several layers of either asphalt or coal tar pitch and reinforcement felts, typically with a layer of gravel embedded in the surface.

Built-up roofing provides a strong barrier against water, foot traffic, and wind damage.

Hot, liquid roofing asphalt or coal tar pitch is used when installing a BUR system, these materials are usually applied using mops. Kegs or bricks of asphalt or coal tar pitch are melted in a specialized kettle onsite during the roof installation and then piped up from the kettle to the roof.


If you are a reputable and qualified built-up roof system manufacturer and feel that we’ve overlooked your company, feel free to contact us to ask to be added to this list.

Built-up Roofing Manufacturers List