Modified

Modified Bitumen

Modified Bitumen roofing is one of the most popular types of roofing systems. It can be installed with one or multiple layers, depending on the roof's substrate. There are two types of modified roof systems; SBS (Styrene Butadiene Styrene) and APP (Atactic Polypropylene). SBS membranes can be mopped in hot asphalt, torch applied, or cold-process applied. APP membranes are torch applied, which requires less room and equipment than a mopped SBS system.

SBS modified systems work well in a warm climate with high UV rays because of its expansion and contraction capabilities. APP systems are very strong because of the fiberglass in the material. Both SBS and APP systems are good heat reflectors because of the granuels in the cap sheet, or top layer. The granules are also a fire retardant. Modified systems should be installed on roofs with not less than 1/4" slope in order to achieve positive drainage.

When installed in single layers, a modified roof system has a 12-16 year life span. Multiple layers add to the life of the system. We offer many different warranties on our modified systems, including and up to 20-year no dollar limit warranties.