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Why does it Matter if my Roof Coating is Elastomeric?

Roofs expand and contract as outside temperatures increase and decrease throughout the course of any given day. This makes it necessary to select a roofing product such as an elastomeric roof coating that performs with high elongation – the ability to stretch an extensive distance while being able to return to its original length after the stress of stretching the product has been removed.

Important considerations when considering elastomeric coatings

Elastomeric roof coatings are coatings that contain a polymer called elastomer. The elastomer has the ability to be elastic when stretched, allowing the polymer to withstand the strain of expanding and contracting with a building or rooftop. Elastomers are very similar to rubber or gum making them an ideal ingredient for roof coatings as they provide excellent flexibility for long-term durability and use, and superior waterproofing and sealing of your rooftop.

Elastomeric roof coatings are generally spray applied creating a monolithic membrane that seals and coats around all roof penetrations such as pipes, drains, rooftop equipment, etc… This provides excellent resistance to water infiltration into the building. The high elongation of the coating allows the entire monolithic membrane to stretch and return to its original state without ripping, tearing or failing. Since these roofing systems contain no seams, the stress is evenly distributed across the roof field, instead of building up at seams and joints, which is where most roofs with seams experience water penetration and failures.

National Coatings has a full line of elastomeric base and top coats for asphalt, single-ply, metal, concrete and SPF roofing. These top coats also contain excellent UV resistant ingredients, protecting the roof membrane from premature aging and embrittlement. This added protection allows the roof coating to remain flexible for a longer amount of time compared to traditional roofing products.

ARC’s® roof coatings are formulated to provide maximum water resistance

a highly reflective roof surface, and maximum UV protection. With the development of the Styrene Ethylbutlyene Styrene (SEBS) reflective roof coatings, a product emerged that not only withstands ponding water, but also provides high reflectivity and prevents damage by solar ultraviolet radiation.

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ARC Roof Coatings®


  • APP membranes
  • SBS membranes
  • Built-up roof membranes
  • EPDM or HYPALON roofs
  • Metal roofs
  • Concrete, concrete block, brick or stucco surfaces for waterproofing.
ARC Reflective Roof Coatings®


  • Elongation properties of 600%
  • Tensile strength of 1000% psi
  • Water absorption rate of 0.004%


When my team made the switch to the ARC® lineup of products we noticed productivity go way up. Thier roof coating process is just so efficient. It made all the difference.

James CarlsonDallas, Texas

The quality of the ARC® roof coatings was way above the industry standard. We have used several different roof coating solutions and the ARC® stuff is just plain better than the others. Surprisingly cost effective too. I would highly recommend.

Steven GibbonsChicago, IL.
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