Fix Leaky Roof Around Chimney

Clean any leaves or other debris out of the gap between the flashing and chimney.

Fix leaky roof around chimney.

First roughen the area around the hole with a wire brush or sandpaper and then clean it. Apply a generous amount of roofing cement behind the flashing. Water test the roof at the area of the chimney using a garden hose. Inspect the flashing for gaps or cracks.

This can involve a significant amount of the roofing tiles felt and flashing to be removed in order to fully uncover the exact leak source and check for any damaged decking or plywood. Use masonry nails or screws to reattach the flashing tight against the chimney. To repair chimney flashing leaks. Use a chisel to remove any hardened roofing cement.

Small holes or corroded spots in flashing can be easily repaired. Plug pinholes with roofing cement and patch holes up to about 3 4 inch in diameter with a patch from the same material as the flashing. Chimney roof leaks are usually caused by gaps or cracks between the metal flashing used to join the chimney to the roof and the chimney. Patch the nail or screw holes by slipping a piece of roof flashing underneath the shingle.

In this case of a roof leaking from around a chimney or fireplace the problem is often the flashing needs to be removed and replaced. Apply roof cement to any gaps or cracks.