Roof Repair | The intensity of the sun and its damaging ultraviolet rays are not just a concern for your skin in the summer months. Think about what it’s doing to the roof you maintain.
A flat or low-slope roof – most of which are black in color – faces the brunt of the sun’s UV rays for several hours a day. This not only can break down and weaken an uncoated roof’s materials, but it can dramatically raise the surface temperature on the roof – by some accounts 60-100 degrees higher than the ambient temperature – and the amount of heat that is conducted to the building’s interior.
The case for coatings
One cost-effective way to extend the life of your roof, while improving your building interior’s energy efficiency is by applying a reflective coating to the roof’s surface. A white elastomeric coating, for instance, can help reflect UV rays and lower the temperature on a roof in warm climates.
According to Building Operating Management, an uncoated, black roof absorbs between 70-80 percent of the solar energy that strikes it, but when a white or light-colored coating is applied, the solar absorption rate decreases to 20-30 percent. That can translate to significant savings in cooling costs. Therefore, in climates where cooling days outnumber heating days, white or light-colored roofs are a worthy consideration for energy efficiency.
But wait; there’s more
Coated roofs can extend a roof’s life dramatically when properly maintained and cleaned, depending on climate conditions. They can often be re-coated as well, further delaying the need for a replacement.
Reflectivity, however, can be compromised when dirt and debris accumulates, so regular inspections – twice per year as well as after significant weather events – are recommended to maintain its integrity.
Roof Repair | When choosing a reflective coating for your building, consider seeking the guidance of an experienced roofer who’s qualified to effectively match your building’s specific roof system type with a coating formulation that will best complement it – and the climate it’s in.