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Two Rivers Construction offers maintenance, repair and installation of various types of flat roofing. Flat roofs can be composed of several types of membranes including EPDM, Modified Bitumen and TPO. Each membrane has it's own unique characteristics and should be chosen based on the intended environment and application.

What is EPDM and what does it look like?


EPDM is an elastomeric compound that is manufactured from ethylene, propylene, and a small amount of diene monomer. The combination of these ingredients produces a product that is able to withstand ultraviolet light, weathering and abrasion, and extremely low temperatures. The ingredients used in EPDM are also resistant to acids, alkalis, and oxygenated solvents. In regards to appearance, black EPDM has a smooth surface similar to natural gray slate. It doesn’t contain the surface granules that can eventually be lost on other materials.

How has EPDM performed since its introduction into roofing in the 1960’s and what is its expected longevity?


Over 1 billion square feet of membrane have been installed worldwide, and various laboratory studies and actual field installations have proven that EPDM is durable and effective in all climates. EPDM’s excellent performance is attributed to its structure and ingredients mentioned in question 1. As a result, EPDM …

  • has superior resistance to UV (ultraviolet) radiation

  • has unmatched resistance to thermal shock

  • exhibits superior resistance to cyclic fatigue

  • has superior resistance to hail damage

  • will not become brittle or shatter due to low temperatures

Many EPDM installations have already exceeded 40 years of exposure in various climates and have not shown alarming signs of degradation. Although its difficult to say for certain, studies have shown that EPDM could have a life expectancy of 50 years.

We are licensed and insured for all kinds of Wisconsin Roofing projects.

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