How to Insulate around a Chimney

What You'll Need
Chimney liner
Termination connectors
Saw or tin cutters
Insulating blanket
Connect clamp

Insulation of a chimney is vital in getting the best from your fireplace. Chimneys can allow in a great deal of cold air if they are not properly insulated, and correct chimney insulation may even be one of the factors in complying with your local building code. One way to do this insulation is to use a chimney liner and liner insulation kits to prevent heat loss through the flue of the chimney. This can be easily done in a day, so home improvement enthusiasts can save a bit of money and effort by performing this simple installation themselves.

Step 1 - Preparing Your Liner

Take the chimney liner out of the package, and place it on a flat surface. Using the hose clamp feature, tighten the bottom connector onto the liner. Measure from the bottom termination point to the top of the chimney's crown, and then add 1 foot. Cut the liner to these measurements, leaving a neat edge.

Step 2 - Adding the Insulating Wrap

Remove the insulation from its kit, and lay it out upon the ground, foil side down. Place the liner in the middle of the insulation material, and begin wrapping the liner, allowing for at least 1 inch in overlap along the seam. Leaving more than around 1 11/2 inches in overlap can cause some difficulties when attempting to install the liner.

Inside the kit, you should have some foil tape, which you should use to secure the insulation seem, 1 tape per foot of insulation fabric. Once this is done, unroll the mesh, and wrap the entire liner and insulation in the mesh, as this will help to keep it safe while you are installing it. Cut away any excess mesh.

Step 3 - Install the Liner

You can install the liner by attaching a rope to the top, and lifting it bodily into the chimney. You will probably need an assistant to pull the rope from one end of the chimney, while the liner is being guided down. During the installation, keep the liner in the middle of the chimney, and avoid touching the sides, in order to prevent damage to the liner or the insulation. Once the chimney is in position, you can cut away the top of the liner, if necessary.

Step 4 - Finishing the Installation

Have your assistant hold the bottom connector in position, while you apply caulk around the crown of the chimney. Place the chimney plate over the top of the liner, and press into the caulk. Hold in position, and then pull the connection band around the liner, securing it to the top plate. Fit the cap over the top of the place, and clamp into position.

At the bottom, cut a hole into the insulation where the fireplace snout will connect to the rest of the fireplace, and secure this snout using a metal band. You should then secure the area of the snout with bricks and mortar, finally making sure that the whole area is insulated and free of cold air.