EPDM, which stands for ethylene propylene diene monomer, has a proven history of providing exceptional life after application in all climates. However, there are times when the material might become damaged. In most cases, this damage occurs due to a seam lifting. This can be due to improper application due to the installer failing to use enough adhesive, or because the membrane was not cleaned properly. Whether the repair is needed due to damage or a seam, the following steps will help you make the proper repair with EPDM coating.
Plan It Out
You will want to plan your repair ahead of time to make sure the weather is going to provide the best conditions. The EPDM will require temperatures of around 55 degrees to cure properly. You will also want to complete the repair with EPDM coating when it is not scheduled to rain. While it will be waterproof right after it is applied, rain can make it appear spotted if it hasn’t had time to cure. It will usually take around nine days for the EPDM to fully cure, or considerably longer if it is applied during cold weather.
Get the Surface Ready
You will need to double check the roof to make sure you have all the areas that need repaired ready. They should have any holes or gaps filled in with a non-silicone caulk. Once those areas are filled in, the area will need to be cleaned thoroughly. A pressure washer works best, but if that isn’t available, you’ll want to make sure you remove all traces of dirt and debris. After that, clean the area with a mild soap and water, or something stronger if there is any mold, mildew, or fungi growing. Once the roof is completely dry, you will be ready to repair with EPDM coating.
You will need to mix the catalyst following the directions provided with your product. You will need a nap roller to ensure an even coating. If there are any areas in which the roller won’t fit, you can go back after the rolling is complete and use a paintbrush to touch up any of those areas. Your goal is to apply a single coat that is around 20 mil thick, which generally equals one gallon to around 40 square feet on a smooth surface. If you are unsure of the proper thickness, take the time to measure off the 40 feet (or 30 if you are working with unsmooth areas), as you want to make sure you have the right thickness. If it’s too thin, it might crack, and too thick will lead to bubbling or excessive swelling.
Make sure to cover the entire surface completely and evenly at the recommended thickness to ensure a proper repair with EPDM. Due to the nap of the roller, it will look slightly bumpy, but the liquid is self-leveling, so this will go away as it cures. If you followed these steps, your application will just need to cure, and the process will be complete.