Elastomeric coatings can be used to repair any leak on a variety of roof types. Examples include wood, polyurethane foam, single-ply roofing, modified bitumen, metal, concrete, and built-up asphalt. These coatings can be used throughout the year because their ability to stretch makes them ideal for dealing with the fluctuations that heat and cold can create. They are seamless, long-lasting, resistant to fungi and mildew, and provide ozone and UV light protection.
There are four types of elastomeric roof coatings:
Butyl: A synthetic rubber that is impermeable to air and possesses tremendous flex properties. Provides resistance against water and most extreme weather conditions. The primary disadvantage is more material must be used to create the desired thickness, which makes them more costly than other elastomeric coatings.
Acrylic: Inexpensive and highly reflective, they are ideally suited for extreme UV climates and provide
resistance to mildew and dirt accumulation. Unfortunately, they do not stand up well to water
ponding and have been known to become brittle under extreme cold temperatures.
Polyurethane: Recommended for strength, durability, and adhesion, which makes them more impact-resistant
and more suitable to handle pedestrian traffic. Not quite as UV stable as other elastomeric they are highly odorous and quick curing, which can lead to waste if not applied quickly enough.
Silicone: The perfect choice when it comes to UV protection and resistance to water ponding. Solid content exceeds 90 percent, which means less material is needed to achieve the required thickness. Erosion is much slower, closer to 50 years, without becoming brittle.