Economical and Long Lasting

EPDM Roofing Systems — particularly designed for use in all types of climates, ethylene propylene diene monomer (EPDM) is a resilient synthetic rubber compound. This roofing membrane is available in both light and dark colors to enhance energy efficiencies. It provides outstanding weathering durability, low maintenance, and design adaptability.

It is an exceptional barrier against extreme temperatures and ultraviolet light, and is exceedingly resistant to puncture and/or penetration. However, it can be vulnerable to the degrading effects of certain oils, gasoline, kerosene, solvents, cooking grease and animal fats. EPDM is inexpensive, simple to install, and clean to work with when compared to conventional built-up roofing systems. EPDM systems generally involve less maintenance, and repairs are rather effortless to accomplish.

EPDM membranes are now manufactured as either non-reinforced or reinforced, meaning the roofing membrane has been strengthened by polyester scrim mats or other supporting materials, and range in thickness from 30 mils (0.03") up to 90 mils (0.09").

Typical installation methods of EPDM consist of loose-laid ballasted, mechanically fastened and fully adhered systems. Since there is no heat or open flame associated with the installation of EPDM roofing systems, they are commonly considered safer and easier to install. A non-woven fleece backing, used to assist adhesion to the substrate, is also offered from manufacturers. The seams along the edges of the EPDM sheets are normally adhered using a manufacturer supplied seam tape or a liquid adhesive.

Loose-Laid Ballasted

The weight of the ballast, be it river rock or concrete pavers, is what holds the loose-laid EPDM membrane in place. This method of attachment is incredibly effortless but very effective. The perimeter and base flashings are usually the only areas that require attachment. River rock ballast normally varies in size from 1-1/2" to 1-3/4". A majority of building codes require 1,000 lbs to 1,200 lbs of ballast per 100 square feet of roof. When using concrete pavers as roof ballast, they need to be a minimum of 18 lbs per square foot and are typically 2'-0" x 2'-0". Depending on the roof formation and wind uplift requirements, additional ballast may be necessary at certain areas of the roof.

Mechanically Fastened

Mechanically fastened roofs rely on special fasteners with metal or plastic discs, which function comparable to washers, to secure the EPDM membrane to the roof substrate. Manufacturers will state the exact placement and amount of attachments necessary to resist wind uplift. The fasteners and disks are later covered with membrane stripping.

Fully Adhered

Fully adhered EPDM systems use a constant application of liquid-applied contact adhesive. With the addition of a fleece backing layer to the EPDM membrane, hot asphalt or low-rise polyurethane foam may be used instead of the liquid contact adhesive. The security of the insulation or base sheet will have to meet any wind uplift requirements.

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