Reduced energy use isn't the only benefit of white roof coatings like those from Conklin - they also extend the life expectancy of several roof systems simply by avoiding the high roof temperatures associated with exposure to the sun.
Heavily insulated roofs block this heat from penetrating the building as heat, but in summer months convective heat transfer to the surrounding air and radiant heat transfer are inefficient. Consequently, the heat has nowhere to go and roofing membrane temperatures can skyrocket.
High roof surface temperatures can shorten the life of the roofing system
Rubber and other synthetic polymers - and especially asphalt - is susceptible to damage after prolonged exposure to elevated temperatures. Roof temperatures can rise above ambient air temperatures by as much as 90°F, accelerating the rate of degradation of the roofing materials - especially when the roof surface rises to 140°F and above. Significant damage can begin to occur at these elevated temperatures, causing both short-term and long-term performance issues.Service life is cut in half for every 18°F increase in temperature (weighted and averaged over time).
Most people appreciate that white roof coatings result in savings on cooling costs, but enhanced roof longevity - especially in northern states - can be another major benefit that results in at least as much savings. Without white coatings, roof temperatures can soar in the summer months because they typically have a lot of insulation to help keep in the heat during the winter months.
Additional Cost Savings
Since ripping out the insulation every summer is of course impractical, white coatings are one of the best means available to counteract the deleterious effects of high heat levels and enhance the prospects for a long-lasting roofing system.
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