If you have a flat roof in Albuquerque or Rio Rancho, there is a good chance someone has suggested elastomeric roof coating as a way to extend your roof's life and reduce cooling costs. It is one of the most common questions we get from homeowners, and the answer is not always straightforward. Elastomeric coating can be an excellent investment for the right roof, but it is not a miracle fix and it is definitely not a substitute for a roof that needs replacement. Here is what you need to know.
What Is Elastomeric Roof Coating
Elastomeric roof coating is a thick, rubber-like liquid membrane that is rolled or sprayed onto an existing flat roof surface. Once cured, it forms a seamless, flexible, waterproof barrier that reflects UV rays and expands and contracts with temperature changes. The term "elastomeric" refers to its elastic properties, meaning it can stretch up to 300 percent and return to its original shape without cracking. This is a critical advantage in Albuquerque, where thermal cycling causes roofing materials to expand and contract dramatically every day.
Most elastomeric coatings used on residential flat roofs in New Mexico are acrylic-based, though silicone-based options are also available. Acrylic coatings are more affordable and work well in our dry climate, but they do not perform as well in areas with ponding water. Silicone coatings handle ponding water better but cost more and can be slippery when wet.
What Does It Cost
Elastomeric roof coating typically costs between $1.50 and $3.00 per square foot for a professional application, including surface preparation and two coats. For a typical 1,500 square-foot flat roof in Albuquerque, that works out to $2,250 to $4,500. This is significantly less than a full roof replacement, which would run $6,000 to $10,000 or more for the same roof.
Some homeowners try to save money by applying elastomeric coating themselves with materials from the hardware store. We strongly advise against this. DIY applications almost always fail within two to three years because the surface was not properly prepared, the coating was applied too thin, or problem areas were not addressed before coating. A professional application done correctly can last 10 to 15 years.
Benefits for New Mexico Flat Roofs
The benefits of elastomeric coating are especially pronounced in our climate. First, the reflective white surface bounces back up to 90 percent of the sun's UV radiation. At our elevation of 5,000 feet, UV intensity is roughly 25 percent higher than at sea level. This reflectivity can reduce rooftop surface temperatures by 50 to 70 degrees on a summer afternoon, which translates to measurably lower cooling costs. Many homeowners in the Albuquerque area report a 10 to 20 percent reduction in summer energy bills after coating.
Second, the waterproofing properties seal minor cracks and surface imperfections in the existing roof membrane. This is especially valuable on aging modified bitumen and built-up roofs where the surface has started to check and crack but the underlying structure is still sound.
Third, the flexibility of the coating accommodates the thermal movement that our extreme temperature swings demand. Where rigid repair products crack and separate, elastomeric coating stretches and recovers without losing its seal.
When Elastomeric Coating Makes Sense
Elastomeric coating is a good choice when your flat roof is aging but structurally sound. If your roof is 10 to 15 years old, has no active leaks, has good drainage, and the membrane is intact but showing surface wear, coating can extend its useful life by 10 to 15 years at a fraction of the cost of replacement. It is also a good option after minor repairs have been completed, as it seals and protects the repaired areas.
When It Does Not Make Sense
Coating is not appropriate when your roof has active leaks, significant ponding water issues, a spongy or deteriorated deck, or membrane that is splitting or delaminating. Applying coating over a failing roof is like painting over rotten wood. It hides the problem temporarily and makes it worse in the long run because it traps moisture. If your roof has these issues, you need repair or replacement, not coating. A honest contractor will tell you this even though coating is a profitable service.
The Application Process
A proper elastomeric coating application starts with thorough cleaning. The roof surface must be swept, pressure washed, and allowed to dry completely. Any repairs, including seam reinforcement, flashing repairs, and crack patching, are done before coating begins. Then a primer is applied if the manufacturer requires one, followed by two coats of elastomeric coating applied at the recommended thickness. Each coat needs to cure before the next is applied. In Albuquerque's dry climate, curing happens quickly, and a typical residential coating job can be completed in two to three days.
If you are wondering whether elastomeric coating is the right move for your flat roof, Alliance Construction Services will inspect your roof for free and give you an honest recommendation. Jose Astorga has applied elastomeric coatings on hundreds of flat roofs across Albuquerque, Rio Rancho, Corrales, and Bernalillo. We will tell you whether coating will work or whether you need a different solution. Call (505) 206-3705 to schedule your free roof evaluation.