Synthetic slate roofing is a popular alternative to natural slate, offering a similar aesthetic with lighter weight and often easier installation. Underlayment is an essential part of this roofing system, serving as a protective barrier between the roof deck and the synthetic slate tiles. Its main purpose is to prevent water infiltration caused by wind-driven rain, ice dams, or minor roof leaks, which could damage the roof deck and the home’s interior. Typically, a high-quality underlayment like synthetic felt or a synthetic membrane designed for roofing is recommended because it provides better durability and water resistance than traditional asphalt felt. The exact requirements may vary depending on local building codes and the manufacturer’s warranty guidelines, so it’s important to check these when installing synthetic slate to ensure long-term protection and maintain any warranty coverage.
To do a simple DIY check on your underlayment, start by inspecting any roof edges or areas where flashing joins the synthetic slate tiles for signs of moisture, mold, or deterioration. If you notice curled or damaged tiles, it could indicate underlying underlayment issues. However, lifting tiles to inspect the underlayment yourself is usually not recommended due to the delicate nature of synthetic slate. Instead, if there are visible leaks or damage, it’s best to call a professional roofer experienced with synthetic slate installations. When speaking with a contractor, ask specifically about the type of underlayment they use and how it complies with the synthetic slate manufacturer’s recommendations and warranty. You might also want to inquire about their approach to flashing and ventilation, as these factors greatly influence the effectiveness of the underlayment and the overall roof performance.