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Material and system description

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.   MB roof systems typically are installed as a two-ply system and almost always   are fully adhered.

There are two types of MB roofing membranes:

  1. SBS polymer-modified bitumen membranes commonly are installed in hot   moppings of asphalt (similar to BUR systems) or cold adhesive. Some SBS modified   membranes are self adhering; that is, they contain an adhesive backing.
  2. APP polymer-modified bitumen membranes typically are heat-welded or   torch-applied. Consumers should be cautioned that NRCA does not recommend   torch-applying a modified bitumen membrane sheet directly to a wood deck.

Generally, APP modifiers impart a “plasticized” quality to asphalt,   and SBS modifiers impart a “rubberized” quality to asphalt. MB membranes and EPDM, a thermoset membrane, often are confused   by consumers because of colloquialisms used by roofing contractors. MB and EPDM   membranes are sometimes called “rubber roofs.”
Surfacing for MB   membranes include aggregate surfacing, mineral surfacing, metal foil-laminate   surfacing and smooth liquid-applied surfacing.

A roof system composed of a built up roof membrane with 2 plies or 3 plies and a   polymer-modified bitumen membrane cap sheet is commonly referred to as “hybrid”   system.