Ask the HOA Expert: Recoat of Many Colors
Written By: Richard Thompson
Wednesday, March 06, 2019
1. To maximize roof service life by reflecting harmful ultraviolet UV radiation.
2. To restore a moderately aged roof to a maintainable watertight condition.
3. To restore an earlier coating applications that has deteriorated.
4. To minimize solar gain and reduce a buildingrsquo;s cooling loads.
5. To improve a roofrsquo;s appearance that is visible from the ground or from an adjacent building.
6. Certain UL->
There are at least three situations in which coating is not a good idea:
1. A coating never makes a bad roof good. If a roof has reached the end of its useful life, coating it is a waste of money.
2. Ponded water that remains for more than 48 hours after a rain reduces a coatingrsquo;s service life. These areas need to be properly repaired to promote positive drainage before applying a coating.
3. Coatings will fail prematu>the coating will not adhere or flake off.
Coatings come in a variety of types:
Emulsions. Consist of asphalt dispersed in a colloidal clay-water blend and are dark gray, brown or black. Emulsions generally increase the roofrsquo;s fire resistance.
Aluminum. A mixture of oxidized asphalt, solvents and aluminum paste, and they are available with or without reinforcing fibers. Aluminum coatings reflect UV radiation, reducing rooftop temperatures, premature aging and building cooling loads. The quality of these products is measured by the aluminum content, expressed as 1, 2, or 3 pounds of aluminum paste per gallon.
Emulsion-Aluminum. A hybrid product with fire resistance and filling/sealing properties of an emulsion coating.
Asphalt Cutbacks. Consist of asphalt and petroleum solvents. Cutbacks are primarily maintenance and restoration products, designed to penetrate, resaturate and restore weathered or aged asphalt built-up roof systems.
Resaturants. Made with either an asphalt or coal-tar base, it penetrates, rejuvenates and weatherproofs existing built-up roofs.
Modified Asphalt Coatings. Made with asphalt, synthetic rubber polymers and solvents and might contain reinforcing fibers. Advantages include increased elasticity and cold-weather flexibility.
Bituminous Coating. Compatible with asphalt or coal-tar built-up roofs or with modified bitumen membranes.
Elastomeric Coating. Formulated from latex/acrylic, Hypalon, neoprene, silicone or urethane. Many elastomeric coatings are compatible with common roof membranes, but they are more widely used with metal and sprayed-in-place polyurethane foam roofing systems.
Consult with a knowledgeable flat roof maintenance contractor to determine the proper coating for yours. The cost of application is usually modest compared to the cost of replacing the roof. So, like changing your car enginersquo;s oil, make coating your roof a regular event. To dress it up, you can custom color it, just like paint. But make sure to apply it at recommended intervals. This is a recoat of many colors that should not be worn out.
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