How Does Rubberized Roof Coating Work?

Application

• The rubberized roof coating bonds to the roofing surface to seal and repair damage. It will bond to galvanized or coated steel, weathered aluminum, concrete, primed wood and fiberglass roofs. The surface may need a light sanding prior to application. The application method and need for a primer varies by brand. Generally, a rubberized roof coating can be sprayed on or applied with a roller.

Properties

• Read the product label. Properties to look for in a rubberized roof coating include a UL fire rating which will tell you how fire resistant the coating is. Check for toxicity to humans and animals. You should be able to apply a rubberized roof coating as long as the weather stays above freezing; however, look for specific temperature application and temperature curing limits. Different brands will vary in their curing times as well. It is also important that the rubberized roof coating be resistant to standing water and mold and mildew. Make sure that the product you use has a guarantee.

Not Recommended

• Rubberized roof coating does not stick well to certain surfaces such as roofs with many layers of asphalt shingles, thermoplastic olefin, certain recreational vehicle roofing systems, modified-asphalt roll roofing, stainless steel, glass, silicone and caulk. It will also not wear well on rooftop decks or patios where there is a high amount of foot traffic. Check the product label for recommended and not recommended substrate lists. Alternative products may be available to seal these substrates.

Considerations

• Roofs are sometimes exposed to high temperatures, which can deteriorate rubberized roofing. However, you can also find white rubber-based roof coatings designed to reflect light and heat. The building stays cooler, and the roof coating holds up better under high temperatures.