How to Enclose the Chimney Stack

Installing an enclosure around your chimney pipe is a surefire way to protect it and improve its appearance. Prefabricated chases and flue wraps are designed for installing around an exposed chimney stack on the roof. These products make it easy to enclose the pipe. With a faux brick model, you can even make it look like a true masonry chimney. Every flue wrap is different, so follow the manufacturer's guidelines for installation details. Whenever you are working with vent piping, it's important to review local building codes for some of the general regulations that may apply to your situation.

Two rulers
Prefabricated chase
Utility knife
Circular saw
Tin snips
Chase crown
Self-tapping screws
Screwdriver
Flange
Rivets
Rivet hammer
Silicone sealant
Lag scews

Instructions

- 1
  Calculate the slope of your roof line so you can cut this angle into the base of the flue wrap. The slope, or pitch, of the roof is simply the rise over the run, or the rate of its drop. Take two straight rulers and set the first one so it is perfectly horizontal and level, with one end touching the roof. Set the second ruler upright from the roof line so it meets the free end of the first ruler. The distance measured with the second ruler is the rise, while the first ruler represents the run. For example, if the second ruler measures 3 inches, and the first ruler is 12 inches long, your pitch is 3/12.
- 2
  Mark the sides and front edge of the flue wrap to create the pitch angle you measured. First, mark the slope into the sides; for example, measure 12 inches of run and make a mark 3 inches up for a 3/12 pitch. Connect the two lines by drawing a straight line on the back side between them.
- 3
  Score the marks you made with a utility knife to allow for a clean cut with the saw.
- 4
  Cut out the lines with a circular saw or other cutting tool.
- 5
  Mark a circle the size of the flue pipe in the chase crown, if applicable. One way to do this is to take an extra chimney pipe section and trace around it. Cut out the circle with tin snips.
- 6
  Set the chase crown on top of the chase and secure with self-tapping screws and a screwdriver. Secure the flange to the base of the flue wrap with rivets and a rivet hammer.
- 7
  Apply adhesive, such as silicone sealant to the flange and mount the chase onto the roof around the flue pipe. Use lag screws and a driver to secure the chase to the roof.
- 8
  Apply more silicone sealant to seal the edges of the flange, the chimney pipe and the crown.

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Home Additions