What Is the Best Coating for a Flat Roof?

Contractors Apply an Acrylic Coating.

What is the best coating for a flat roof?

When you want to preserve your roof and protect it from problems like leaks, a flat roof coating is the ideal solution. Several types of roof coatings are available including silicone and acrylic coatings. The type of coating you’ll want will depend on the type of the roof you have and what your primary purpose is for adding coating, although silicone coatings are quickly becoming the preferred coating for most flat roofs.

Flat roofs are prone to collect water and because silicone is not a water-based material, it doesn’t absorb water like other coatings, which makes it an ideal flat roof coating for ponding water. Moreover, silicone won’t “chalk off” or slowly shed over time. It also doesn’t require a roof fabric to reinforce it and you need fewer coatings, so it is easier to install. But silicone is also slippery when it gets wet, and attracts dirt easily, which reduces its reflective properties. 

Acrylic coatings are also durable as well as inexpensive to install. Because they are highly reflective, they are well-suited to warm climates. They are also highly mildew resistant and don’t accumulate dirt as easily as silicone. They work well on metal roofs. They aren’t as effective at fighting off ponding as silicone. It’s clear different coatings work best for different situations, and if you want to know more about a flat roof coating in Mobile, AL, the professionals at Mobile Roofing & Construction can answer your questions. All you need to do is call 251-888-0301

How often should a flat roof be coated?

To maintain the protection a flat roof coating provides, your roof should be recoated every two to four years. Moreover, about every two years, you should inspect your roof for any flaws like blisters or cracks that could leave your roof vulnerable to leaks and other problems. 

How to apply flat roof coating

For all the protection that they can provide, flat roof coatings are easy to apply. To apply a coating:

  • Clean the roof thoroughly. For best results, use a trisodium phosphate (TSP) solution.
  • Repair any tears, punctures, or open seams with sealant. You may need to reinforce the sealant with roof fabric. Plastic roof cement should be avoided. 
  • When the roof is dry and sealant set, add the coating. Coating can be sprayed, rolled or brushed on. A minimum of two coats will be needed. The top coat should be thick.

A question might come up when it comes time to recoat the roof after a few years: How do you recoat a flat roof? The answer is simple: You use the same process outlined above. You can add the new coat directly over the old one. This is one of the appeals of restoring your roof with a coating, rather than replacing it outright: as the original coating wears out, you can continue to apply new coatings almost indefinitely. Although it’s recommended to re-coat about every two to four years, coatings can last 10 years or more. The older the coatings get, however, the less effective they become as they begin to wear thin.

What do you use to seal a flat roof?

Before you add a flat roof coating, you will need to make any necessary repairs. Most repairs can be made with a crack and joint sealant. You want to use a sealant that is flexible and will move with your roof. Some repairs may also require roofing fabric. The roof coating itself will seal pinhole cracks in the roofing material. All repairs are made primarily to prevent leaks.

Flat roof coating options

There are several types of roof coatings available on the market today. Acrylic and silicone are two of the most widely used in both commercial and residential roofing. Polyurea coatings are also available. These coatings tend to be thicker than elastomeric coatings like acrylics. Although not technically a coating, SPF spray foam is useful for protecting and insulating flat roofs. Roof coatings are applied over SPF for further protection.

Some flat roofing materials like TPO and PVC do not require coatings, as they already have reflective properties to protect from UV radiation. These roofing materials also shed water better so protect from leaks and ponding as well.

What is the longest lasting flat roof?

Although TPO roofing has become popular in the past decade or so, PVC roofing still edges it out when it comes to longevity. PVC roofs can last up to 30 years. Most other flat roofing systems last anywhere from 10 to 20 years.

A Roofer Applies a Roof Coating.

Flat roof coating contractors near me

If you want to protect and preserve your roof with a flat roof coating in Mobile, AL, you can always count on the professionals at Mobile Roofing & Construction for exceptional service. We offer a wide range of coating services. Find out more or get an estimate by calling 251-888-0301.