Masonry Chimneys

Masonry Chimneys

Masonry chimneys should have a flue liner to help reduce the possibility of the masonry absorbing creosote. If the flue liner in your chimney is cracked or damaged, it may allow creosote to accumulate and heat to escape. This could increase the chance for a chimney fire. Several products are available to reline your masonry chimney and repair a damaged flue. Before you hire someone to reline your chimney, consider these points:
  • Has the relining product been tested and listed by a nationally recognized testing laboratory?
  • Ask the contractor/dealer who will install the liner if they have been trained in this process and how long they have been installing this type of liner.
  • Ask your local code authorities (such as your building or fire department) if they accept or approve the liner you choose.
Fireplace Inserts or Hearth Stoves

These types of solid fuel burning appliances should have the vent directly connected to the flue of the chimney. This "positive connection" is intended to reduce the creosote accumulation in the flue. An example is shown below.

Factory-Built Metal Chimneys

Factory-built metal chimneys specifically designed for use with a solid fuel heater are often called prefabricated, Class A, or all-fuel chimneys.

If you plan to use or buy a prefabricated metal chimney, consider these points:
  • Be sure the unit is tested and approved by a nationally recognized testing laboratory.
  • Do not try to use a natural gas or fuel oil vent, well casing, stovepipe, or other material as a chimney. These materials are not designed to withstand the high temperatures produced by a woodburner.
  • Use only the type of metal chimney specified by the manufacturer of your unit. There are several different types of metal chimneys for woodburners and some may not be suited for your unit.
  • The installation of the chimney must be done exactly as the manufacturer recommends. Most prefabricated metal chimneys have a minimum of 2 inches clearance to all combustible materials such as wood studs or joists and any type of insulation.
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- Your Guide to Woodburners
- Home Safety Tips

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