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A chimney liner is held in place by a top plate and attached top clamp, both of which should be included in most chimney liner kits. The top plate seals to the top of the chimney flue and attaches directly to the liner. This not only holds the liner in place but supports its weight in the chimney.

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.

Your fireplace flue is open when the chimney is unsealed and open to the outside air and sky. That’s why one of the best ways to figure out if your flue is open is to visually check for daylight inside of your chimney—or to feel for a draft, which may be generated by the difference in temperatures inside and outside of your home.

When your fireplace is not in use for longer periods of time, such as over the summer, you can keep smells at bay by spraying either a commercial fireplace deodorizing product or a blend of one part distilled white vinegar to one part water around the walls of the fireplace. 

Or, you can place a container of charcoal inside the fireplace to absorb odors. Just be sure to remove it before it’s time to start using the fireplace again.