Polymer-modified bitumen or modified bitumen (MB) sheet membranes were developed in Europe in the early 1960s and have been in use in the U.S. since the mid-1970s. Polymer-modified roof membranes are composed of reinforcing fabrics that serve as carriers for the hot polymer-modified bitumen as it is manufactured into a roll material. MB roof system membranes are composed of multiple layers, much like BUR membranes. Modified Bitumen Roof systems typically are installed as a two-ply system and almost always are fully adhered.
There are two types of MB roofing membranes:
- SBS polymer-modified bitumen membranes commonly are installed in hot moppings of asphalt (similar to BUR systems) or cold adhesives. Some SBS modified membranes are self-adhering; this is, they contain an adhesive backing.
- APP polymer-modified bitumen membranes typically are heat-welded or torch-applied. Consumers should be cautioned that the NRCA (National Roofing Contractors Association) does not recommend torch-applying a modified bitumen membrane sheet directly to a wood deck.
Schedule a Complimentary Inspection of your Commercial Modified Bitumen Roof Now!
To experience our fully digital, transparent, industry-leading roofing services, complete the form below and we will follow up to schedule an appointment and give your project the attention, skill, and expertise it deserves.
This site is protected by reCAPTCHA and the Privacy Policy and Terms of Use apply.
