Flashing is a critical component when installing synthetic slate roofing because it prevents water from seeping into vulnerable areas like valleys, chimneys, vents, and skylights. Synthetic slate often has a different thickness and flexibility compared to natural slate or asphalt shingles, so it’s important to choose flashing materials that work well with these characteristics. Metal flashings like aluminum or copper are preferred due to their durability and resistance to corrosion. The flashing should be installed in a way that allows water to flow over it smoothly without trapping moisture beneath the synthetic slate panels. A common best practice is to use step flashing along roof edges and around protrusions, ensuring each piece of flashing is integrated with the synthetic tiles to create a continuous waterproof barrier.
If you’re inspecting or installing synthetic slate yourself, look for signs such as curled or lifting flashing edges, rust, or gaps between the flashing and the roof surface which can signal potential leaks. You can carefully check these details with a flashlight and a mirror if the spots are hard to reach, but avoid walking on the tiles to prevent damage. When hiring a roofer, ask them to explain which metal and sealing techniques they will use around tricky areas and how they ensure a tight fit with synthetic slates specifically. For example, you could inquire, “What type of flashing metal do you recommend for synthetic slate, and how do you secure it without compromising the tile?” and “How do you maintain roof warranty compliance when integrating flashing with synthetic slate systems?” These questions help ensure your roofing system is both secure and backed by proper warranty coverage.