Modified bitumen membranes were developed in Europe in the early 1960s and have been in use in the U.S. since the mid-1970s. Modified Bitumen is asphalt that has had modifiers added to it to give it plastic or rubber-like properties. They are typically installed as a two-ply system and are almost always fully adhered.
Old Pro roofing installs two types of modified bitumen membranes: SBS polymer-modified bitumen and APP polymer modified bitumen. SBS modifiers are commonly installed in hot moppings of asphalt or cold adhesive. Many of the new products are even available in a self-adhering roll. APP modifiers are usually heat welded or applied using a torch. SBS modifiers give asphalt a rubberized quality, while APP modifiers give it a more plasticized quality.
Most of the modified bitumen products used by Old Pro Roofing have a mineral coated surface but it is also available with a smooth surface. When installing modified bitumen, we typically tear the old roof off down to the decking. We then install fiber-board insulation on top of the decking to increase strength and moisture resistance. Next, a base sheet is installed which is either mechanically fastened or self-adhered. The final step is to install the modified bitumen membrane which can be hot-mopped, torched, or applied using a cold process.
Modified Bitumen is a great choice that has a proven track record in commercial and residential roofing applications. Let the pros at Old Pro Roofing show you how modified bitumen may be a great choice for your commercial or residential flat roof.