Bad weather is not the only thing that can harm your roof, according to William A. Kirn, a Registered Roof Consultant. Most people know that heat, rain, snow, sleet, and high winds can wreak havoc on your roof over time, and all roofs eventually need to be replaced. But the single most damaging component is ultraviolet and infrared radiation from sunlight. The radiation will attack the membrane of the roof and cause a string of chemical reactions to take place. We see the same thing with our skin, as too much sun can actually alter the structure and the DNA within our cells.
Over time, continuous exposure to the sun’s rays can cause shrinking and splitting of the shingles. Many roofing professional will coat the roof with a white, protective layer because white reflects light. This unfortunately does not mean that the roof will be shielded from the harmful effects of the sun.
In his article titled “Why Good Weather is Bad for Roofs,” Kirn states, “Most organic polymers (except aromatic urethanes) do not deteriorate under UV attack but are transparent to UV radiation. This allows the UV to move freely through the coating and attack the substrate, in this case the waterproofing material. The UV can easily be blocked by the incorporation of pigments.”
Good elements that work great at protecting your investment include titanium dioxide, zinc oxide, and calcium carbonate. This UV and infrared radiation blocking material should be applied over the waterproofing material.
A qualified roofing professional should be able to address any questions you might have regarding protecting the longevity of your roof.
Thanks to Focx Photography for the photo of worn roof tiles.