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How to Install a Flexible Chimney Liner

By Edited Nov 13, 2013 0 0

Your fireplace or wood burning stove needs to be vented outside of your home. This is typically done through your chimney. Your chimney is an essential part of removing the combustible and poisonous gases from your home. Most experts recommend installing a chimney liner in the flue. This can extend the life of your chimney and is a job that many homeowners can perform themselves. One of the best types of liners to install is called a flexible chimney liner. Often when installing a liner you need the flexibility to maneuver the liner so that is doesn't get stuck in the chimney. If you have determined that this is your best course of action, then the next question that you have is “How to install a flexible chimney liner?”.

You can do the installation of the flexible chimney liner yourself (if your towns building codes allow for this) but you will most likely be required to have a building inspector from your town to inspect the final work so that they can assure that it has been done correctly.

Before you begin the installation you need to be sure that the chimney is in good repair. This is a good opportunity to inspect the chimney but you should do this on a regular basis so that you can stay on top of a problem should one arise. Make sure that there do not appear to be any protrusions inside of your chimney that may prevent you from sliding in the liner. Once you have done this you will need to measure the opening of your chimney to determine the width of the flue liner to purchase. You will also need to measure the distance from the top of your flue to the top of your fireplace or stove. This will allow you to determine how long of a flexible chimney liner that you will need. You can easily do this with a long piece of rope.

Take the rope that you have and tie a large knot in the end of it. Lower the rope down your chimney until it is accessible to your from inside of your house through either your fireplace or wood burning stove. Once you have it inside you will raise it up from above and the other person will help you position the rope near the top of your fireplace. This will give the length of liner that you need to purchase.

Once you have purchased the correct size of chimney liner in the required lengths you will then begin to install the product. You will also want to purchase a closing plate for your chimney to be installed when the job is done. This plate should overlap the inside edge of the brickwork at the top of your chimney by a couple of centimeters.

This is a two person job. You will need someone to help you with the installation. You should assemble all of the tools that you will need for the job so that you are not constantly climbing up and down a ladder onto your roof. You will need tin snips, screwdrivers, hammer, trowel, pliers, cold chisel, etc. You will also need a length of rope that is about 25 – 30 feet long.

The first step that you will want to take is to sweep and clean your chimney. If you do not have the tools for this you will need to buy the right size chimney brush and enough chimney rods to clean the length of the chimney. Before you do this it would be best to seal off the inside of your home so that the debris and dust does not enter the room where your fireplace or wood stove is located.

Once you have cleaned the chimney you can proceed with installing the flexible chimney liner. If you have a chimney pot on your current chimney you will need to exercise great care when removing it. You you chisel away some of the cement that is holding it in place. Carefully set it aside to re-install once you are done installing the flexible flue liner.

It is also recommended that you wrap insulation around your flue liner. This will keep the flue warmer and create a better updraft. It will also help condensation from forming near the top of the flue and sending water droplets back toward your fire.

You will pull up your flexible liner from above. Drop your rope back down the chimney. Take the end your your flue liner (make sure it is pointing in the right direction) and mash down the last several inches so that it is flat. Then create a fold in this flattened section of flue. Fold it back onto itself. Then run your rope through this fold and tie it off. Add extra security by duct taping the entire area. Fold over the sharp edges of the flattened section so that it doesn't get caught on the chimney as you pull it through. Pull the flue through the chimney can be a frustrating experience. It will get caught from time to time. You will have to work with your install partner and attempt to move the chimney liner back and forth to free it up. The more precautions that you take before attempting to install the flue the easier the process will go.

Once you have pulled the liner through the chimney cut off the excess portion from the top. You can now re-install your chimney pot or chimney cap if you had one. If you are installing this on a wood stove make sure to hook your flue over the flue outlet of the stove.



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