Today, there are many materials available to choose from, for waterproofing a flat roof. In the past several years liquid applied membranes proved to be a feasible, economical, and more environmentally friendly solution. When searching through various roof “coatings”, as these materials are commonly called, roofing contractors realize that not all are created equal. There are a few general categories of liquid applied membranes for roofing, each of these categories including large varieties of products to choose from. While the 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, and silicone, urethane, and PMMA. Most of today's roof coatings provide the benefits of reflexive white color, which redirects away much of the UV rays and lowers the temperature of the roof during direct sun exposure, characteristics known as a Cool Roof. Additionally, 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. Let’s bring some light to several critical aspects when choosing the appropriate waterproofing solutions for flat (commercial or residential) roofing.