Relining Your Chimney


The winter season is approaching us faster than most can believe, and with that comes and increase in people using fireplaces in their homes.  This means that now is the best time if you have not already to schedule your routine chimney maintenance.  Pozzi Chimney Sweep’s professionals are ready to take care of all your needs for the season, including the yearly chimney sweep.  One of the things they will check is your chimney’s lining.

The flue liner protects the exterior masonry from heat damage. Over the life of your home, it may have to be relined.

The flue liner protects the exterior masonry from heat damage. Over the life of your home, it may have to be relined.

So, your main question is probably why do you need a chimney liner?  Chimney liners were not deemed necessary until the 1980s when the National Bureau of Standards (NBS) tested masonry chimneys for questions about performance and safety.  They are important in preventing anything that may be combustible inside of your chimney from catching fire.  Unlined chimneys have the tendency to heat up quickly that nearby woodwork can catch fire in less than fur hours.  Also, a chimney liner will protect your masonry and lengthen the overall life of your chimney.  They will help keep acidic flue gases from entering brick and mortar and ruining the durability of the overall chimney structure.  When this happens heat transfers to combustible particles and creates an environment good for Carbon Monoxide, which can be extremely harmful to your health.  Lastly, chimney liners help create the correct sized flue so the unit can function better.  A liner that is not the correct size however can lead to extra creosote buildup.

There are two types of liners; clay tile liners and metal chimney liners.  Masonry chimneys are usually lined with clay tiles, which are great because they are inexpensive.  The downside to this type of liner is that sometimes they do not distribute the heat evenly and as the uneven tiles heat they can expand, causing flue tiles to expand, crack, and break.  If your chimney’s liner is cracked you must repair it before continuing to use it.  Metal liners can generally withstand more heat and corrosion, often times brought on by gas or oil vents.  If you suspect that there is a problem with the lining in your chimney, always call the professionals, because what looks like a small problem can easily turn into trouble.