Elastomeric Roof Coatings

Elastomeric roof coatings made from acrylic emulsions have an advantage over low-grade asphalts which are prone to deterioration. Roof coatings based on acrylic copolymer emulsions are tough and flexible. Superior resistance is shown to water ponding along with dirt pick-up resistance and reflectivity. 

While field exposure conditions can vary, the Tg for an elastomeric copolymer should be lower than the minimum low temperature for a given geographic region where the roof coating is to be apphed (i.e. <20 °C). This helps assure that during cold weather, the membrane will remain flexible and thus, prevent the roof membrane from cracking under contraction stresses. 

Waterproof. Waterproofing barrier systems may be either hot- or cold-appHed. The hot-appHed generaUy involve a bituminous material such as asphalt used in conjunction with a reinforcing fabric such as roofing felt, cotton, or glass cloth. Cold-appHed can be bituminous or elastomeric materials either in Hquid or sheet form, with or without fabric reinforcement. Liquid elastomeric treatments include neoprene, polyurethanes, and blends of these or epoxies with bituminous materials. Among the commonly used precured elastomeric sheet materials are neoprene, polyisobutylene, EPDM mbber, and plasticized PVC. Polyethylene and PVC films and nonwoven plastic or glass fabric coated with bituminous materials also find use (78). Because these... 

---