How to Make a New Chimney for a Wood Stove Through a Metal Roof

Review the building codes specific to your area before beginning work. Building codes may have guidelines that control where a chimney can be placed, and how high it should extend. In most places, it should extend 3 feet above the surrounding roof line, and 2 feet higher than the roof line within 10 feet. Make sure your chimney kit and stove piping can fit these specifications.

Determine where the chimney will be placed, and plan your stove pipe installation accordingly. Many interior wood stoves require venting that reaches straight through the ceiling and to the roof. You will need to cut openings wherever the pipe passes through these areas.

Measure the diameter of your chimney pipe and add the necessary width per local clearance requirements. Some building codes require 2 inches between the pipe and combustible surfaces.

Cut a hole in the roof for the chimney, according to the dimensions you measured, using metal shears or a circular saw.

Extend the chimney piping down through the hole in the roof until it extends to the required height.

Install flexible roof flashing according to manufacturer instructions. Many products have a rubber cone that can be cut to the dimensions of your chimney pipe. Once you have cut it down, slide it down over the pipe and secure it flush with the roof. Use silicon sealant to seal in place and install self-tapping screws to secure. Make sure the flashing conforms to your metal roof.

Install the storm collar by placing it around the top of the chimney and bolting in place. If your chimney extends higher than 4 feet, connect it to a support bracket and bolt the legs to the roof for extra support.

Complete the interior insulation of the stove piping. Extend the chimney pipe through the ceiling. Install an attic insulation shield around the piping if it runs through an attic, and a ceiling support box wherever it runs through other ceilings. Follow manufacturer instructions for these installations. They may require that you cut a square hole and construct a wooden frame where the shield or box can be nailed in place. These installations ensure safe passage of the pipe through combustible flooring.

Run the chimney pipe down to about 4 inches below the ceiling support box. Install a chimney pipe adapter to the end of the chimney and connect to the stove piping. Secure the stove pipe sections to the flue collar of your stove.