EPDM
EPDM membranes are classified as a vulcanized elastomer (also referred to as thermosets). During the manufacturing process the ingredients (polymers) are chemically cross-linked to form the membrane. Once these chemical links have formed, they are permanent and can not be changed. Typical colors are black or white. EPDM membranes are produced by extrusion, calendering and lamination. Seaming of EPDM membranes is accomplished only through the use of an adhesive bonking agent. EPDM membranes are available in non reinforced and scrim reinforced versions. EPDM has been used as a roofing membrane since the early 1960's.
Product Variations:
There are several variations of EPDM membranes. The most commonly used variants are listed below:
A. Different polymer composition.
B. Reinforced and Non-reinforced membranes
C. White or Black membranes
D. Thickness and widths
E. Fleece backing
F. Cleaned membrane or coated with talc or mica.
Method of Installation:
EPDM is attached using paver or stone ballast, mechanical fastener or adhesive methods.
Product Advantages:
A. EPDM has the largest membrane dimensions in the roofing industry which translates to less seaming.
B. EPDM has a long duration of successflJI performance. Based on life cycle analysis, EPDM is a verI cost effective roofing system. 35 plus years track record.
C. Most EPDM roof membranes do not require slope and are warrantable under ponded water cpnditions. D. EPDM manufacturers are financially sound and have the resources to back up the performance warranties of their products.
Product Liabilities:
A. EPDM is available through lumberyard type distributors and inexperienced applicators.
B. EPDM with a low polymer content can exhibit sheet shrinkage and a reduction in tear strength.
C. Non-reinforced EPDM is being installed in mechanically fastened applications.
D. Seaming becomes an important Issue.
1. Talc, mica separation agents or environmental debris must be scrubbed clean prior to bonding seams.
2. Climatic conditions play an important role in quality seaming. Lack of attention to seaming will produce inferior performance.
E. EPDM is marketed through companies that private label materials manufactured by others and not themselves.
Warranties:
EPDM warranties range from poor to a "NO DOLLAR LIMIT" on labor & materials. Some manufacturers allow warranties to be transferred to future owners. Some are perorated and some limit warranty expense to the amount of original roof purchase price. Coverage time includes: 5, 10, 15 & 20 year for materials and labor. Total system warranties are also available. Wind coverage's range from 45 mph to an engineered 120 mph system. Excellent Factory Mutual certification as well as UL, Warnock-Hershey I etc.