What are the different types of chimney relining?

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There are many different types of chimney relining that can be used to get your fireplace back in order. Even if you are planning on using an insert, the lining has to be capable of protecting your home from heat and flame, and preventing heat transfer. Heat transfer refers to the loss of heat through the chimney structure that can reduce the efficiency of your heating elements.

 The 3 types of chimney relining

There are three basic types of relining materials that are used. Each has a different application and it isn't always as simple as picking the one that is in your budget. The three types are:

1. Clay tile
2. Metal
3. Cast in place

 Type 1 - Clay tile

The traditional chimney lining is made from a clay or terracotta tile. The tile is rarely flat, but is formed like boxy sections of pipe. The lining is stacked inside the chimney and runs up to the cap. There are many advantages to this style of chimney, but it is also almost only used for new construction. The clay material is solid proof against heat transfer and is durable too.

 Type 2 - Metal

This type is most commonly used when you are installing an insert into a fireplace. It is also gaining popularity as a relining method for existing chimneys that can structural fit the specifications for the use of a metal sheathing. The metal may take the form of a flue pipe, it may be an insert fitting that only goes partially up the chimney, or it may also be a full lining of the chimney. There are some types that are set into flame resistant, insulation barriers to prevent heat transfer in the chimney and others are installed away from the chimney walls to resist heat transfer.

 Type 3 - Cast-in place

Cast in place is gaining popularity in new homes and renovations. With this method a light concrete type material is poured along the inside of the chimney to form a new lining. The material is flame and heat resistant. This can be an involved process as it requires the use of a mold or form. In general, cast in place relining material can only be used on chimneys that have a separate heat transfer barrier installed. If your chimney is structurally sound, but the interior lining has degraded, this is often the fix.

 Which do you need?

Deciding which of the chimney relining processes you need isn't something you should do on your own. Talk to the professional contractor who will be doing the job to understand the options that are available to you. Remember that there is more to consider than just price when it comes to relining a chimney. Safety and heat transfer capabilities are much more important. Price can be reduced by talking to the contractor about the various options for installation within the type that is needed in your chimney. You may be able to save money on the job by doing something as simple as your own clean-up. The contractor may also be able to get you discounted materials by purchasing over-runs from other jobs too.

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