Installing Roof Coatings in Cold Weather


As we begin 2020 and continue having cooler temperatures, we want contractors to know the challenges of installing roof coatings in cold weather.

Water-based coatings are risky this time of year. Acrylic coatings, mastics, and primers are likely to freeze and ruin if the temperature freezes the night after they are installed. Freezing is not the only issue—cooler temps can dramatically slow the dry time of water-based coatings. Wash-offs are common this time of year due to slow drying and dew or rain causing problems days after coating are applied. Please keep your installers educated and install these coatings only at 50°F and rising.

Solvent-based coatings are the better option, but also come with challenges. Urethane and silicones both thicken when the coating is stored in cold temps to the point that they can become very difficult to spray or roll. The roof surface or air temperature is not nearly as important as the temperature of the coating. If the products are stored at 70°F, they will spray or roll well, even on a roof that is currently at 35-40°F. Storing these products below 60°F can cause the material to thicken. We do not recommend installing roof coatings below freezing temperatures because precipitation on the roof will not be as evident.

For more information on installing roof coatings in cold weather, check out our post on preparing your hydraulic spray-rig for winter.

Please call Technical Services with any questions at 800.309.6416.

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