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Cracks in the chimney can be very serious, depending on their location and size. Even small cracks can become serious over time if left unrepaired. Cracks allow heat and moisture to deteriorate your chimney and harmful carbon monoxide gas to seep into your home. Small cracks can often be caulked, while large cracked sections may require full replacement.

Signs that your chimney may need to be replaced include visible damage like cracks in the structure, bricks, or mortar, as well as crumbling or flaking mortar and loose bricks. Leaks, dampness, discoloration, and efflorescence (a white, stain-like substance on the bricks) are also key indicators of water damage, which can compromise the chimney's safety. Addressing these problems is essential, as a chimney in this condition may be at risk of collapsing and causing major damage to your home. A full replacement costs about $10,000 on average, but can range from $3,100 to $15,400.

You can, but you shouldn’t. While you can still start a fire in your fireplace, the smoke and other fumes won’t have a proper way to escape if the flue is cracked. By continuing to operate your fireplace, wood stove, or furnace, you are putting your home at risk of absorbing toxic byproducts of the fire source.

If you’re looking for a cost-effective alternative to a traditional chimney, consider having a dummy chimney installed. Dummy chimneys can either be aesthetic-only or fully functional and can be installed on both new and older homes. Whether installed to match your neighborhood’s aesthetic or to vent your chimney, dummy chimneys are made out of a Glass-Reinforced Plastic (GRP) core, then covered with brick or stone slips to look like a traditional chimney.