Roofing Services Manchester NH | Call Keystone Siding

In Manchester, our freeze-thaw cycles and heavy precipitation put immense stress on roof valleys and flashing—the critical junctions where water is directed off your roof. Over time, ice dams, thermal expansion, and weathering can cause metal flashing to separate or the sealant in valleys to fail, creating direct pathways for water into your attic and walls.

Our repair process starts with a full inspection to find the leak's origin. For valleys, we often remove the old, compromised material, install a new ice and water shield membrane for superior waterproofing, and then re-cover it with durable, properly interwoven shingles or metal. We ensure the valley is wide enough to handle Manchester's heavy rain and snowmelt, preventing future backups and leaks.

We carefully remove the damaged flashing around chimneys, vents, skylights, and wall intersections. We then prepare the surface, install a new base layer of waterproof membrane, and fabricate and secure new, high-grade metal flashing. Proper installation is key—we ensure it's stepped, overlapped, and sealed correctly to withstand wind-driven rain and thermal movement, providing a long-term seal specific to New England weather.