A prefabricated chimney can vent wood stoves and other appliances safely.
Prefabricated chimneys offer a simple option for adding a new chimney to an existing home when installing a wood stove or another appliance that requires venting to a chimney. The key to such installations is to be aware of the specific requirements set by the manufacturer, as well as local building codes. These guidelines will determine the appropriate venting configuration, clearances and other considerations. Make sure you review these requirements before beginning. If you are ever unsure about a step, contact the manufacturer or a professional for assistance.
Instructions
1. Select a location for your chimney that won't interfere with other roof elements.
2. Position the stove so the flue collar is between the ceiling joists, if applicable. Connect the stove pipes to the flue collar, using metal screws or as directed.
3. Mark the location where the chimney will penetrate the ceiling and drill a starter hole. Cut a square opening based on the size of the ceiling support box using a jigsaw.
4. Install the ceiling support box as directed by the manufacturer. This may require that you construct a frame in the hole for mounting the box. Slide in the support box and mount it in place with screws so that it hangs 3 inches down from the ceiling.
5. Cut holes in additional ceilings, using a jigsaw, if there are multiple stories in your home. Mount firestop radiation shields in each additional floor, and an attic insulation shield in the attic, constructing a frame based on manufacturer instructions. The shields and support boxes function to insulate and provide structure wherever the chimney penetrates a floor.
6. Extend chimney sections down into the support box. Depending on the manufacturer, the chimney may lock in place in the support box, or may need to hang down through the box to connect to a stove pipe adapter. Secure pipe sections with 1/2-inch metal screws or as directed.
7. Cut a hole in the roof of your home, using a drill and jigsaw, based on the size of the chimney flue diameter. Review the guidelines of the stove and add the required clearances when cutting the hole. In many cases, 2 inches of clearance is required on all sides between the pipe and combustible materials.
8. Extend chimney pipe sections through the roof, to a height of at least 3 feet or as required by local building codes.
9. Install roof flashing and a storm collar to the topmost section of the chimney. Pry up the shingles carefully and slide the roof flashing in place. Nail the shingles back down around the pipe to create a watertight seal. This is essential to ensure your roof does not leak. Secure the storm collar around the chimney and bolt it in place.
10. Place a chimney cap on the end of the flue and secure it as directed, using builder's adhesive or as directed by the manufacturer.
Tags: , building codes, ceiling support, chimney flue, directed manufacturer, Extend chimney, flue collar