Flashing Repair & Installation
One of your chimney’s most important shields against water infiltration is its flashing, which is installed on all four sides where the chimney rises up out of the roof. When you’re trying to keep water out of anything — including a chimney — seams are potential weak points. So the seams between the chimney and the roof are of particular concern, and strong, properly- installed flashing is your best defense against leaks there.
Flashing Installation Explained
Proper flashing is constructed in layers, to provide optimum protection against water. A base layer of what’s called step flashing is installed first — L-shaped metal pieces are laid in with the roof shingles and up against the chimney. On top of the step flashing, we place counter flashing, which gets integrated with and installed into the mortar joints. Remaining seams are reinforced with caulk for even more protection.
With that layered construction, bolstered by caulk, water shouldn’t have any weak points to get into, and your chimney and home should have strong protection against water infiltration for years.
The materials used in flashing can differ, but the most commonly used are galvanized metal, stainless steel and copper. Galvanized metal will be the least expensive option, but it’s also the least durable, and often succumbs to rust and corrosion in relatively short order, making the installation of new flashing necessary. Stainless steel provides much longer-lasting protection.
Is your flashing in need of repairs, or do you need new chimney flashing installed? Northeastern Masonry & Chimney is here to help. Give us a call at 518-767-9315 or click here to make an appointment with our experienced, CSIA-certified technicians!