Polymer-modified bituminous roofing

Oba, K., and Roller, A., Characterization of Polymer-Modified Bituminous Roofing Membranes Using Thermal Analysis, Mater. Struct., 28 596-603 (1995)... 

Minutes of the April 28-29, 1988 Meeting, CIB/RILEM Committee on Elastomeric, Thermoplastic and Polymer Modified Bituminous Roofing, RILEM, Paris, France (April 1988)... 

Specialty Eaves Flashing Membranes. Specialty eaves flashing membranes are polymer-modified bituminous sheet materials that are used as underlayment to resist leakage of shingle roofs as a result of ice dams. These sheet materials contain an adhesive layer which is exposed by removing its protective sheet. Special eaves flashing membranes can also be useful in warmer climates where a similar backup of water can occur from an accumulation of pine needles and leaves. 

Polymer-modified bituminous membranes were developed in Europe in the mid- 1960s and have been in use in North America since 1975. The polymeric systems have varied from natural rubber to more complex synthetic systems sueh as block copolymers and polymer blends. Most common polymers used as modifiers are polyisobutylenes, polybutadienes, polyisopienes, styrene-butiene-monomer, styrene-butadiene-rubber, butyl rubber, ethylene-vinylaeetate (EVA), atactic polypropylene (APP) as well as natural rubber. Polymers, such as atactic polypropylene or styrene-butadiene-styiene (SBS), impart flexibility and elasticity, improve cohesive strength, resist flow at high temperatures, and toughness.1 1 They are the most widely used modifiers of bitumen-based roofing materials. 

---