Built-Up Roof

Material and system description

Statewide Roofing a Commercial Oklahoma Roofing Company install Built-up roof

Built-up roof Built-up roof Built-up roof systemA21Built-up roof membranes , referred to by the acronym BUR, have been in use in the U.S. for more than 100 years. These roof systems are commonly referred to as “tar and gravel” roofs. BUR   systems generally are composed of alternating layers of bitumen and reinforcing   fabrics that create a finished membrane. 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.
The reinforcing   fabrics also are called roofing felts or ply sheets. Roofing felts are   reinforced with either glass-fiber mats or organic mats. Felts are produced in a   standard width of 36 inches and metric width of about one meter.
The bitumen typically used in Built-up roof systems is asphalt, 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. Asphalt is a petroleum product refined   from crude oil; coal tar is derived from the distillation of coal. Cold-applied   adhesives typically are solvent-based asphalts that don’t have to be heated in a   kettle or tanker.
Surfacing for built up roof systems include aggregate (such as gravel, slag or mineral granules), glass-fiber or mineral surfaced cap sheets, hot asphalt mopped over the entire surface, aluminum coatings or elastomeric coatings.

A roof system composed of a built up roof membrane with two or three plies and a polymer-modified bitumen membrane cap sheet is commonly referred to as “hybrid” system. NRCA considers this type to be a polymer modified bitumen membrane   system. In Oklahoma call Statewide Roofing in for all your Built-up roof needs.

Material standards

NRCA does not make any recommendations about which product or manufacturer to use; however NRCA does recommend that bitumen’s, felts and mats used for BUR systems   meet standards established by ASTM International.