Does your home have a fireplace that you use regularly? If so, you'll want to make sure that the liner is in good condition. The potential dangers of a bad liner include the chimney catching on fire. Here is what you need to know in order to identify a chimney liner that needs replacement.
Mortar That's Decaying
A chimney will have joints that use mortar to hold it all together. Over the years, the mortar within the joints will crumble and crack.