My Chimney Cap Leaks

Roof Leaks

• Functional holes in your roof, such as plumbing vents and chimneys, are notorious for leaking. Roof leaks, which may take years to make themselves known, often lead to mold growth and an increased risk of water damage. The first sign of a malfunctioning chimney cap may appear as water drops or pooling in or around your fireplace or furnace. Immediate investigation can save you time and money in costly repairs.

Cap Repair

• Strong winds can dislodge your chimney cap, allowing rain water to enter your chimney pipe and run into your home. Although most homeowners can replace or repair various styles of chimney caps, some of the older masonry chimney caps require the tools and expertise of a qualified brick mason.A lifted or displaced metal chimney cap is one of the most common causes of a failed chimney system that results in water leakage. Resolve this issue by reattaching the screws that hold a metal chimney cap in place. If this occurs more than once, you may need to use a lower profile chimney cap or additional screws to hold it firmly in place.

Cap Replacement

• A missing or damaged chimney cap requires replacement. Select the correct size and style cap for your specific chimney flue liner. Attempting to use the wrong size cap may result in a build-up of carbon monoxide fumes within your home. Attach the new cap according to the manufacturer’s instructions. Depending on the style of cap you use, you may need to place a membrane flashing around the bottom of the cap or a bead of silicone caulking to help direct water flow or seal out leaks.

Considerations

• Sometimes a leak that seems to come from the chimney cap actually occurs in a different area of your chimney. Although the center of your chimney is one of the most likely sources of leaking, a leak that continues after replacing or repairing the cap requires further investigation. Check the area around the crown, which is the section of the roof structure that meets the chimney piping. Cracks in the mortar along this area may allow water to slide down the outside of the chimney pipe.