An elastomeric coating is a thick, flexible waterproofing membrane applied directly to a roof surface. Formulated with elastic properties, it expands and contracts with temperature fluctuations without cracking or peeling. Elastomeric coatings are widely used to extend roof life, improve energy efficiency, and provide a seamless barrier against moisture infiltration and UV damage.
Mil thickness refers to the measurement of a roof coating’s depth, where one mil equals one-thousandth of an inch. This measurement is critical in roof coating applications because thicker coatings generally provide greater durability, waterproofing capability, and UV resistance. Contractors specify mil thickness in project proposals to define the level of protection being applied to your roofing surface.
Reflectivity describes a roof coating’s ability to reflect solar radiation away from the building rather than absorbing it as heat. High-reflectivity coatings — often called “cool roof” coatings — can significantly reduce indoor temperatures, lower cooling energy costs, and minimize thermal stress on roofing materials, ultimately extending the lifespan of the underlying roof system.
In roof coating terminology, the substrate is the existing roof surface onto which a coating is applied. Common substrates include metal, asphalt, modified bitumen, and single-ply membranes. Proper substrate preparation — including cleaning, priming, and repairing damaged areas — is essential to ensuring strong coating adhesion and long-term performance of the finished system.
Ponding water refers to standing water that remains on a flat or low-slope roof surface for 48 hours or more after rainfall. It is a major concern in roof coating projects because prolonged water exposure can degrade coating materials, accelerate membrane breakdown, and lead to structural damage. Roof coatings with superior waterproofing properties are specifically designed to withstand ponding water conditions.
A primer is a preparatory coating applied to the roof substrate before the main roof coating layer. It improves adhesion between the surface and the coating, seals porous materials, and helps prevent issues like delamination or bubbling. Skipping this step can compromise the entire coating system’s integrity, making proper priming a non-negotiable part of a professional roof coating installation.
An acrylic coating is a water-based roof coating known for its excellent UV resistance, flexibility, and ease of application. It is one of the most commonly used roof coating types due to its cost-effectiveness and high reflectivity. While acrylic coatings perform exceptionally well in drier climates, they may require additional layers or alternative formulations in areas with heavy or frequent rainfall.
Seam sealing is the process of reinforcing joints, seams, and penetrations on a roof surface — such as around vents, skylights, or flashing edges — before applying a roof coating. These vulnerable areas are common entry points for water infiltration. Properly sealing seams with compatible materials ensures that the roof coating system delivers uniform, continuous protection across the entire roof surface.
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