Metal Construction News, February 2021
Cool coatings are solar refl ective pigments that have been altered both physically and chemically to refl ect infrared radiation while still absorbing the same amount of visual light Certain pigments refl ect light better than others mainly used on metal roof panels and referred to as cool roof coatings explains Alexander A cool roof is Cool Coatings and can refl ect antique styles patina aesthetics or natural metals stonework and wood To create a print effect a one color basecoat and then a one or two color tint coat is applied on top that has some opacity says Alexander Coil coaters use a special print roller such as a roto gravure that has a pattern template The pattern is rolled on the top of the primary basecoat to create the desired effect According to Moffat textures have become more popular because of the look it provides One way to add texture to a prepainted metal is by adding texture within the coating Another way is to use an additive which creates the textured effect during the curing process A textured coating is performance you can see and feel adding a nice distinctive fi nish to any project says Alexander one that refl ects the heat emitted by the sun back into the atmosphere keeping the temperature of the roof lower and thereby reducing the amount of heat transferred into the building below resulting in a cooler building which means less energy used and lower energy bills According to King with most coatings available with solar refl ective cool pigments lighter colors will always outperform darker colors for solar resistance In certain environments where this is critical to lower cooling costs and achieve building effi ciency needs such as those outlined by LEED this may limit color selection The best way to validate this is to understand the Solar Refl ective Index SRI needs for a project then validate suitable colors on a product color card Photo courtesy of PPG Industries Inc Photo courtesy of Sherwin Williams Coil Coatings Photo courtesy of PPG Industries Inc February 2021 METAL CONSTRUCTION NEWS 19 www metalconstruct ionnews com
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