![]() ![]() ![]() “There’s a significant challenge in getting a water-based coating to stick to a low-energy substrate because of the two contrasting surface energies,” explains Iyer. Because these primers present handling and environmental hazards, the industry prefers water-based alternatives. One approach to address this challenge is to use solvent-based primers to achieve adhesion. Adhesion to TPO is a significant challenge for water-based solar reflective roof coatings due to its very low surface energy. They’re installed as a rolled membrane that can be either mechanically fastened to the roof or adhered with a roofing adhesive. TPO membranes have been the predominant choice for low slope roofing in the past several years. These substrates include metal, spray polyurethane foam, asphaltic, built-up roofing (BUR) and membranes such as TPO, PVC and EPDM. One of the formidable challenges that solar reflective roof coatings encounter is the need to adhere to diverse roofing substrates that can vary substantially in the chemistry of their composition. “They have a huge impact on the building in terms of reducing its energy consumption while also cooling the environment around it to mitigate the heat island effect.” The shift in substrates “People choose solar reflective acrylic roof coatings because they’re able to reflect the heat energy of the sun,” says Dr. These lifespan-extending coatings are popular due to their ease of application, optimum cost-to-performance balance, energy efficiency and sustainability. They must also be flexible enough to withstand extreme temperature changes and resist cracking and delamination from the substrate. Solar reflective roof coatings are a part of a building’s envelope, acting as a protective barrier against inclement weather, damaging UV rays and water permeation. Many of these changes have been driven by environmental initiatives to reduce energy cost, lower CO 2 emissions, address climate change concerns, and lower volatile organic compound (VOC) emissions. Over the past several decades, there have been many changes to traditional low slope roofing materials and substrates.
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