- 1). Check and repair the flashing, which is a protective barrier installed along the brick. Most chimneys also have a counter flashing, which must be properly aligned with the brick mortar. Even a small crack above the flashing can permit significant water intake. Watch for soldered corners of flashing that are broken or have holes.
- 2). Inspect the crown. The crown is the concrete top of the chimney that is angled to disperse water and hangs slightly over the brick to keep the chimney face dry. Inspect the crown for cracks and other signs of damage, especially leading into the flue. Small cracks can be fixed with polyurethane caulk; for more serious issues, you must call a chimney repair specialist.
- 3). Replace old flashing with better flashing. The best kind of chimney flashing to prevent leaks is copper or lead-coated copper. Aluminum flashing tends to corrode. It may also benefit to seal the porous brick with a paint sealant, but this must be done in conjunction with a reliable flashing.
- 4). Install a "cricket" in the back of the chimney. The cricket is a small structure that diverts water away from the chimney. They can be installed after the construction of a house and chimney but it is best (and least expensive) to include it during the construction process.
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