Flashing

Deteriorated flashing which may be leaking.

If your roof is leaking, one of the prime suspects is often the flashing.  Flashing is the sheet metal that keeps the intersection between the chimney and roof watertight. It comes in different types, depending on the design of the chimney and homeowner preference, but it is generally made of two layers of overlapping metal plates or “shingles” held on by and sealed with caulk. These shingles form a “skirt” around the base of the chimney so there is no joint there where water can leak in.

Over time, flashing degrades.  It can rust, deform, or pull away from the chimney or the house.  Sometimes damaged flashing is repaired with caulk or tar.  These products may temporarily stop leaks, but they do not expand and contract at the same rate as the chimney or the roof, and eventually crack and pull away, usually within only a year or two.  A product called “FlashSeal” is available which will last somewhat longer.  In cases of extreme flashing deterioration, Barnhill Chimney prefers to install new flashing, which lasts longest of all.

A technician creates a piece of copper flashing.

Barnhill Chimney installs only copper flashing.  Copper chimney flashing is the most durable type of flashing, with the longest service life. Properly maintained and serviced, it can last the life of your roof. It also has the advantage of being solderable, for a watertight seal. Copper can also be embedded in fresh mortar and won’t degrade, even in mortar that’s continuously saturated.