Whether is a new deck or an existing roof system this process is very important, as liquid products need to adhere directly onto the clean bare substrate surface. This type of surface does not accept any other kind of coating, as silicone surface will obstruct the adhesion.Įqually important before waterproofing a flat roof is the proper cleaning of the substrate. Another example, is a roof previously covered with silicone. The solvent contained by most urethane coating presents a high risk of re-emulsification for the acrylic. For example, it is a bad idea to apply urethane over a surface previously coated with acrylic elastomeric. Not paying attention to the type of material previously used to coat single-ply roofs can be a costly mistake. The first condition that must be met in choosing the right material is the compatibility between the existing roof surface and the liquid product intended to be used. When deciding the most suitable solution for waterproofing a flat roof, the building owner or property manager should take in consideration with equally importance not only the expertise and reliability of the roofing contractor, but as well, the material system chosen. Entirely replacing the old roof system with a new one is often prohibitively expensive, but in the past several years liquid applied roof systems emerged on the market as reliable worthy alternatives. What to do before waterproofing a roofĪ large proportion of the flat roofs covered two or three decades ago with single-ply roofing membranes such as torched-down modified bituminous membranes (mod bit) or with EPDM, are today good candidates for being recovered. Let’s bringing some light over several critical aspects when choosing the appropriate waterproofing solutions for flat (commercial or residential) roofing. Most of today roof coatings provide the benefits of reflexive white color, which redirect away much of the UV rays and lower the temperature of the roof during direct sun exposure, characteristics known as Cool Roof.Īdditionally, recovering existing roofs using liquid applied solutions brings the significant environmental aspect of not having to add thousands of tons of scrapped roofing materials every year to the landfills. While Miami-Dade County Product Approval database makes a distinctive difference between maintenance coatings and liquid applied roof systems, the most frequent fluid products found in both categories are elastomeric, polyurethane, silicone, urethane, and PMMA. There are a few general categories of liquid applied membranes for roofing, each of these categories including large varieties of products to choose from. When searching throughout various roof “coatings”, as these materials are commonly called, roofing contractors realize that not all are created equal.
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In the past several years liquid applied membranes proved to be a feasible, economical and more environmentally friendly solution. Today, there are many materials available to choose from, for waterproofing a flat roof. How much it costs to waterproof a flat roof.