What is the difference between PM and PB EIFS?
PM: Polymer Modified: Thick cementitious base coat applied over glass fiber reinforcing mesh. The joints in this system are similar to that in traditional stucco. This system uses a standard finish however a elastomeric finish can be used to fill any hairline cracks that could occur with the thickness of the base coat. PB: Polymer Based: This system typically uses adhesively fastened, expanded polystyrene (EPS) insulation as well as fiber reinforcing mesh embedded in a nominal 1/16 inch base coat. PB EIFS may include additional lares of base coat and reinforcing mesh in order to create a higher level of impact resistance. An EIFS finish coat is applied over the entire base coat.
