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My Chimney Is Leaking After a Storm, What Do I Do?

Last updated October 25, 2026

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The short answer

Stop the Water First

If the chimney is leaking, your first job is to keep more water from coming in. A tarp over the top of the chimney, secured with bungee cords or rope, can block rain for a short time. You can also place a large plastic bin or bucket under the leak inside your home to catch drips.

Move furniture, rugs, and electronics away from the affected area. Open windows if the weather allows to increase airflow. The longer water sits, the more damage it can do to walls, floors, and framing. If you can safely access the roof, check for obvious gaps or cracks, but never climb up in slippery conditions.

Look for the Likely Causes

Storm leaks around chimneys usually come from one of a few places. The flashing, the metal strip where the chimney meets the roof, can pull away or crack. The crown, the concrete cap at the top, may have hairline cracks. Bricks and mortar can also erode over time, letting water seep through.

Water often shows up far from the actual entry point, so the leak may not be directly above the stain. Check the attic around the chimney base for wet insulation or dark streaks. If you see daylight through any joints, that is a clear sign of a gap.

  • Flashing lifted or separated from the roof
  • Cracks in the chimney crown or mortar joints
  • Missing or damaged chimney cap
  • Clogged gutters or downspouts sending water backward
  • Ice dams forming at the roof edge during winter

Dry Out the Affected Areas

Once you have stopped the active leak, drying the wet materials is critical. Use fans and a dehumidifier to pull moisture from the air and surfaces. Remove wet carpet padding or drywall if it is soaked, as these can hold water and lead to mold growth.

Do not wait to start drying. Even a small leak can cause wood rot or mold if left damp for days. A water damage pro can use moisture meters to find hidden pockets of water in walls and insulation. They also have industrial drying equipment that works faster than household fans.

When to Call the Pros

You can handle the immediate tarp and cleanup, but a professional assessment is wise. A water damage inspector can trace the leak path, identify all affected materials, and recommend the right repairs. They can also spot structural issues that are not obvious from the ground.

If the leak is large, or if water has spread to ceilings or walls, call local water damage pros. They have extraction tools and drying systems that can prevent secondary damage. For the chimney itself, you may also need a mason or roofer to fix the flashing or repoint the bricks.

Prevent Future Leaks

After the storm passes, take steps to reduce the chance of another leak. Inspect the flashing and crown twice a year, especially before winter sets in. Keep gutters clear of leaves and debris so water flows away from the chimney base.

Heavy snow and ice can stress the roof and chimney in cold climates. Consider having a professional check the flashing and mortar before the cold season. Sealing small cracks early is far easier than dealing with a major leak later.

  • Inspect flashing and crown after every major storm
  • Clear gutters and downspouts regularly
  • Seal any visible cracks with masonry caulk
  • Trim tree branches that overhang the roof
  • Check attic insulation for damp spots

Talk to someone now

Call (952) 522-6744 any time, day or night, and describe what happened.

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Frequently asked questions

How long can I wait before fixing a chimney leak?

You should act quickly. Water can soak into wood and drywall within hours, leading to mold and rot. Even a small leak can cause big problems if ignored. Cover the chimney and start drying right away, then call a pro to assess the damage.

Can I fix the chimney leak myself?

Some minor repairs, like sealing a small crack or replacing a cap, are doable if you are comfortable on a roof. But if the flashing is damaged or water has spread inside, a professional should handle it. Incorrect repairs can make the leak worse.

Will my insurance cover chimney leak damage?

Policies vary, and your insurer decides what is covered. Storm damage is often covered, but gradual wear is usually not. Take photos of the leak and any damage, and check your policy for exclusions. Your insurance company can tell you what applies.

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