Built Up Roof Systems

We've Done Roofing Installation & Repair for Decades

Built-Up Roof Installation in Dallas, Houston, San Antonio, Austin, and Denver

Built-up roof systems (BUR) have been in use in the United States for more than 100 years. These roof systems are commonly referred to as “tar and gravel” roofs or “asphalt flat roofing.”

Asphalt Flat Roof Characteristics

Asphalt Flat RoofThe BUR roof system, or asphalt flat roofing, consists of multiple plies of roof felts laminated with bitumen. The bitumen typically used is asphalt (hence the name “asphalt flat roofing”), coal tar or cold-applied adhesive. The asphalt or coal tar is heated in a kettle or tanker and then applied by mop or mechanical spreader. Cold-applied adhesives typically are solvent-based asphalts that don’t have to be heated in a kettle or tanker. The typical surface for built-up roof systems consists of gravel with a heavy application of asphalt or cold tar. The number of plies in a cross section is the number of plies on a roof: The term “four plies” denotes a four-ply roof membrane construction. Sometimes a base sheet, used as the bottom most ply, is mechanically fastened. Built-up roofs generally are considered to be fully adhered if applied directly to roof decks or insulation.

Over the years, BUR has earned a great reputation with building owners, architects, engineers, roofing product manufacturers and roofing contractors. The asphalt flat roofing system has a good life expectancy, usually in the 15 to 25 year range.