Single-Ply Membranes Commonly Used In The Western United States

PVC: Made of polyvinyl chloride it is one of the most versatile membranes for commercial and industrial applications. It is usually available in 40 to 48 mils thick and generally white. This type of material typically meets 'cool Roof' standards.

CPA: Produced by alloying polymeric plasticizers, stabilizers, biocides and antioxidants with PVC compounds. They are typically produced in thicknesses of 30 to 50 mils.

TPO: Roof membranes are compounded from a blend of polypropylene and ethylene-propylene rubber polymers. Flame retardants, pigments, UV absorbers and other proprietary ingredients may be included in TPO formulations. The membrane may be reinforced and usually is available in white or black but other colors may be obtained. Thicknesses generally range from 40 to 100 mils.

EPDM: Made of a elastomeric compound synthesized from ethylene, propylene, and a small amount of diene monomer. These membranes are available in 30 to 60 mils and are usually black or white in color.