Installing slate roofing according to manufacturer specifications means following precise steps to ensure durability and warranty compliance. First, begin by inspecting the roof deck to confirm it’s clean, dry, and structurally sound. The underlayment must be installed correctly, often using a breathable felt or synthetic membrane designed for slate; this acts as a moisture barrier. Next, install metal flashing around chimneys, valleys, and edges to prevent leaks. When laying the slate tiles, it’s essential to start at the bottom edge of the roof, overlapping each course so water flows downhill. Nails should be stainless steel or copper and placed through the slate’s pre-drilled holes to avoid splitting. The spacing and overlap will be specified by the slate manufacturer—for instance, 3 inches of exposure is typical, but this can vary by product and climate. Proper alignment and overlapping prevent water infiltration and ice dams.
Before finalizing installation, a basic visual check ensures all nails are flush without raising the slate, no cracks or chips exist, and flashing is secure. DIY homeowners can carefully inspect these areas but avoid climbing on the roof unless comfortable and safe; instead, use binoculars or a drone for close-up views. It’s wise to call a professional roofer when sealing valleys or flashing, or if unsure about slate placement and securing methods, as improper work can void warranties. When meeting a contractor, ask, “How do you ensure slate overlaps meet the manufacturer’s exact exposure recommendations?” and “What type and size of fasteners will you use to maintain slate integrity and warranty coverage?” These questions help confirm their approach matches manufacturer requirements for a long-lasting beautiful roof.