What is the expected longevity of EPDM membrane?

With most EPDM installations exceed 20 years of exposure in the field under various climatic conditions. Even though it would be difficult to predict, studies have shown aged EPDM membrane as having a potential life expectancy of 30 years.

How popular is EPDM single-ply membrane?

Studies have shown that within the United States, EPDM represents up to 25% of the entire low slope roofing market. In Europe the market share is around 12% and growing. While it is difficult to predict percentages in other markets, accelerated growth is reported in the Middle East and China as well.

How can the performance of EPDM be gauged over the last 40 years?

With over 1 billion square feet of membrane installed worldwide, EPDM has established itself as the membrane for all climatic conditions. This is supported by various laboratory studies and actual field installations. This excellent track record is the result of unique and unmatched physical characteristics:

• EPDM has superior resistance to UV (ultraviolet) radiation
• EPDM has unmatched resistance to thermal shock
• EPDM exhibits superior resistance to cyclic fatigue
• EPDM has superior resistance to hail damage
• EPDM will not become brittle and will not shatter due to low temperature flexibility

What is the difference between black EPDM and white EPDM membrane?

In addition to the oils and the polymers used to make an EPDM membrane, another ingredient is added to the mix to enhance UV resistance. In the case of a black membrane, carbon black is added, which converts UV rays into heat. With white membrane, in lieu of carbon black, titanium dioxide is typically used to reflect UV rays and prevent it from attacking the polymer.

Are temperature limitations associated with the installation of EPDM roofing system?

In accordance with ASTM standard D 746, EPDM membrane has a brittleness temperature of -49 F. While the membrane will remain flexible and pliable in extremely cold temperatures, adhesives, flashings and tapes should be kept at room temperature (hot boxes are usually used on the rooftop to rotate adhesive cans and rolls of flashing). Although roofing contractors may select not to work in sub-freezing temperatures due to safety concerns, many EPDM installations have taken place in temps below 20 F.

Does EPDM require systematic maintenance or additional coatings or treatment to achieve its life expectancy?

No. No special coating or other surface treatment is required. General maintenance in the form of good housekeeping should periodically be performed to remove debris and leaves, and to investigate the performance of other components.

Can EPDM be coated or painted?

Acrylic coatings are available that can be applied directly to a prepared EPDM surface. Preparation usually consists of cleaning the EPDM with a pressure washer and a detergent solution or wash. Latex-based paint products can also be used, however, the EPDM manufacturer should be contacted prior to application to ensure compatibility and continuation of warranty coverage.

Is EPDM environmentally beneficial?

EPDM is one of the most sustainable and environmental materials used today in the construction industry. Its excellent performance transfers to low life cycle costs and less impact on the environment.

The initial production of the membrane has a low embodied energy number (the amount of energy required to produce and implement a product from material extraction, manufacture, and installation). Also, several other components (cleaners, primers and adhesives) were developed for use with EPDM to reduce VOC (Volatile Organic Compounds) emissions during installation.

Post-industrial products can be reincorporated (recycled) into the manufacturing of other roofing products and accessories (i.e., walkways and roofing tiles), thus minimizing the impact on landfills.

Generally speaking, is an EPDM single-ply membrane roofing system cost effective?

Dollar-for-dollar, EPDM roofing systems are the greatest value in the low slope commercial roofing industry. While installation costs vary from system to system as well as from building to building, generally, ballasted roofing systems have the lowest installed cost per square foot followed by mechanically fastened and fully adhered systems.

How long can an EPDM roofing system be warranted?

Generally speaking, standard warranties that cover material are available in 5, 10, 15 and 20 year increments.

Would repairs to an EPDM membrane be impaired by aging?

No. One of the most unique attributes of EPDM is its ability to be easily repaired as well as its potential for restoration unparalleled in the roofing industry. The characteristics of the membrane are such that, even after years of field service and exposure to the elements, repairs and/or modifications, such as the installation of a new rooftop unit, can be accomplished with ease and with the expectation of long-term performance.

Unlike other roofing systems that degrade or become brittle over time due to UV exposure, EPDM single-ply membrane maintains its integrity and flexibility. This allows for modifications as easy as washing the membrane, preparing the roofing membrane surface, adhesive applications, and the installation of new material.