Tuesday, October 23, 2012

Liquid EPDM vs. Other Roofing Materials

When compared to other roofing materials and sealants, Liquid EPDM may seem more expensive. As it turns out, the other materials will cost you more in the long run. Here’s why.

Liquid EPDM is identical to the older sheet EPDM rubber that was often used in roofing to waterproof and protect the underlying timber or other materials. The primary disadvantage of the sheet type is that there are seams. Even when seam-sealers are used, rain and temperature eventually cracks the seams. If the damage is not caught early enough, leaks are the outcome.

Liquid EPDM rubber is seamless. It is self-adhering. So, there is no need to use adhesives or fasteners, which are a source of corrosion and leakage. The liquid can also be used on any shape or angle.

Other liquids and sheets are now available, but none last as long as EPDM. It is resistant to tearing, ozone, abrasion and temperature changes.

The other liquid sealants require the use of primers, multiple coats and top coatings. EPDM is a one-coat system that does not require primers. That’s the first way that your overall cost is reduced. You don’t have to buy the primers and you don’t have to use multiple coats.

Another way that you save money has to do with repair and replacement. The initial EPDM coating can be applied three times as thick as neoprene and other elastomers. In side by side comparisons, the EPDM last three times as long as those other materials. It is also superior to acrylics and urethanes.

When compared to neoprene, which is an older elastomer that is less expensive, EPDM has a wider temperature range. It can withstand temperatures as low as 40 degrees and as high as 300 degrees without cracking, swelling or bubbling. Neoprene’s temperature range is from 60 degrees to 250.

The biggest “temperature” disadvantage of neoprene is that it cracks during cold winters, especially if ice builds up on the roof. This is not usually a problem with EPDM, because the temperature inside of the building will usually keep the roof temperature at or above freezing. It’s still a good idea to remove ice build-up, just to be on the safe side.

Neoprene is also less resistant to water damage and swelling. When you have to replace or repair something frequently, you can see how the costs add up. You’ll find that liquid EPDM really pays for itself as the years go by. With a 25 year history of success, you simply can’t go wrong with liquid EPDM.

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