Considered the natural evolutionary development of Built-Up Roofing, this method involves the use of three-foot wide rolls, comprised of asphalt combined polymerized rubber, reinforced via fibreglass or polyester. This results in a flexible, yet highly durable waterproof membrane that is highly advantageous in holding up to our erratic Canadian climate. - given the propensity of buildings to shift due to temperature extremes.
First, a smooth base sheet layer is installed followed by the modified bitumen rolls, which are granulated on top.
Modified bitumen rolls applied typically “torched-down” in a staggered manner, but there are also newer peel-and-stick alternatives. Due to the general convenience of this method, many choose to use “torch-down” as their method of choice to repair older BUR roofs.