If you're thinking about using EPDM for your roof in Spring Valley, you should know that several different types of it might be available. EPDM, which stands for ethylene propylene diene monomer, is a synthetic rubber membrane that is extremity durable and flexible. The synthetic rubber comes primarily in two colors: black and white. Black EPDM is not really a green choice, but it's the one that some manufacturers prefer for low-slope roofs in colder climates because the membrane is far more effective at capturing and holding heat. White EPDM works well in low-slope applications too, but because it's designed to reflect sunlight instead of absorb it, some local building codes actually prefer it for use in warmer climates.
Another consideration is how to attach the membrane: fully adhered, mechanically fastened, or ballasted (the three methods are pictured above). Fully adhered systems are glued directly to the roof deck, with maximum flexibility for complex designs. Mechanically fastened systems employ metal or plastic fasteners and make a good choice for windy areas because they're more resistant to uplift. Ballasted systems employ heavy stones or pavers that hold down the membrane. Each of these installation methods has its advantages and disadvantages; we'll cover them in more detail and let you know which method we recommend.
Besides the installation method and type, it is critical to consider the thickness of the EPDM membrane. The standard thickness is between 45 and 90 mils, with more durable membranes being thicker. However, the warranty options for different thickness levels are what most guide my decision. The warranty for the thicker membrane covers 20-plus years, while the warranty for the thinner option barely covers 10 years. I generally recommend going with the membrane that has the longer warranty and the thickness that (if the area ever needs replacing) will have the labor-free, hassle-free closed-roof system that is covered in insurance policies.
