How To Install a New Chimney Liner Yourself

With the modern fireplace, you’re going to need a chimney liner in order to safely keep your room or your home warm. Before you begin installing a new chimney liner yourself, make sure that you are up-to-date on local building codes and requirements. You may need to purchase a permit for this work to be done on your property.

Do You Have Everything You Need?

Before beginning, make sure that you’ve got all of the components that you will need for a successful installation. The liner is going to come in a coil, so you will need to straighten out the liner before beginning. Watch out as you take off the protective plastic coating because the coil can sometimes spring out on you. Within the chimney, run your measurement from top to bottom to determine where you need to cut the liner to length with a pair of tin snips.

Make Sure to Insulate Your Chimney Liner

Once cut to size, you will need to insulate the chimney liner. This is a national building code and ½ inch liner insulation is required. You can get ¼ inch insulation, but you will need to wrap the liner twice. Affix insulation tape to keep the covered liner in place and then wrap it with mesh in order to fully secure it.

You’ll want to drop the chimney liner from the roof into place instead of trying to push it through the bottom of the chimney. You will likely need to bend it to put it into place, so look for cracks or separation as you place the liner. You’ll likely hit the smoke shelf, which is your cue to go inside to finish the interior installation first.

Now You’re Ready to Move to the Interior Portion of the Installation

The stove top adapter is the next piece of the insulation. It fits on the outside of the liner and affixes with a basic pipe clamp. This allows the creosote to stay within the fireplace or fireplace insert that you are installing. To reduce your draw, you may want to coat the area with furnace cement so that you get a good seal. Once this has dried, you’re ready to connect the liner to your fireplace or fireplace insert.

Now you can place your insert into your hearth area.

Now you’ll need to go back up on the roof. You’ll be cutting the excess top of the liner to size, so make it flush with the top plate that you’re intending to use. Attach the top plate after you’ve cut the liner to size, affix a bead of silicone caulk underneath the top plate so you can get a good seal. Then affix with screws, but be careful not to break out any liners that you’re using, such as a terra cotta liner.

You can use a heavy weight on the liner to help the caulking set if you prefer, but the screws hold up better against a windy environment. Seal up any holes or screws that you’ve placed with caulking sealant as well so that you get a weather-resistant, tight fit.

Run a bead of silicone around the edge between the top plate and the chimney liner to seal out insects and rain from the chimney as well. It doesn’t have to be a perfect bead because it is going to be covered up by the cap. Just clean up any excess caulk that has come up on the side of the plate.

Now you’re ready to slide your chimney cap into place. Tighten up the clamp and you’re done!