How do I know if I need a new liner in the chimney?
A wood burning appliance (wood stove or fireplace) needs a "class A" chimney of proper size. This basically means that the chimney must be structurally sound, with a tile liner, or its equivalent. The liner in the chimney is to contain the liquid creosote so that it does not seep into the masonry structure. In the event of a chimney fire, this liner helps to contain the fire, so it does not spread to the surrounding combustibles. If the liner is nonexistent, too large for the appliance or damaged due to age or chimney fire, the liner needs to be replaced. The best way to be sure is to contact a professional chimney sweep to evaluate your situation.