What's involved in a chimney relining job?

The first step in a chimney relining project is to remove any debris that may have accumulated in the chimney.

They check to see if a chimney is clear by pulling a probe up the chimney. While you need to remove large obstructions, it is not necessary to entirely clean the chimney as the new liner will serve as a brand new flue. You will get the best draft possible by installing the as large a liner as is practical.

Often they will attach a winch to the top of the chimney and then pull the new chimney liner up from the bottom. Chimney liners can also be pulled down the chimney. How the chimney liner is installed will depend on the unique requirements of the particular chimney and the preferences of the particular installer. Chimney liners are quite flexible, so while it may need some encouragement, there should be no problem pulling it up the chimney.

After being installed chimney liners need to be insulated. While many installers skip this step, it is actually fairly important. You will get a better draft from an insulated chimney liner as it will be able to heat properly. Insulation for chimney liners usually comes in two different types: vermiculite mixed with concrete that is poured down the chimney or a ceramic wool blanket. The use of a ceramic wool blanket often requires greater clearance, thus forcing you to use a smaller diameter pipe. This could cancel out any benefits when it comes to a better draft.

When using a ceramic wool blanket for chimney liner insulation it is best to wrap the pipe before installing it. The insulation should first be placed on a flat surface, and then the chimney liner should be placed on top of it in the center. An adhesive spray is used to keep the insulation in place as it is wrapped around the liner. The combination of liner and insulation is then covered with a wire mesh to protect it during installation. Added strength is received from an additional wire that is wrapped around the mesh. Large hose claps are placed at each end to hold the mesh in place.



 

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