How to Vent a Chimney Chase

A chimney chase, or flue, is the pipe used to carry the products of combustion safely out of the building. It is vented out of the top of the building in a way that both produces a good draft and prevents water penetration into the chimney. A chimney vent should be 2 feet above anything that is within 10 feet of it. If a chimney vent exceeds 5 1/2 feet, it needs to be supported with a side brace attached to the building.

Metal b-vent
Vented chimney flashing
Storm collar
Caulking
Rain cap
Drill
Self taping screws

Instructions

- 1
  Connect sections of metal b-vent until the chimney is 2 feet above anything within 10 feet of its penetration through the roof. The sections of b-vent push together then turn to lock in place.
- 2
  Screw three self-taping screws through each joint in the b-vent to permanently secure them together.
- 3
  Slide the vented flashing over the top of the chimney and down to the roof. Insert the top of the flashing under the top row of roof shingles. Hammer three roofing nails through the bottom of the flashing and into the roof.
- 4
  Slide the storm collar over the top of the chimney and down to the top of the flashing. Put a continuous bead of caulking around the place where the storm collar and b-vent meet. Put a dab of caulking on top of the nail heads holding down the flashing.
- 5
  Insert the rain cap onto the top of the b-vent. Fasten in place with the drill and three self-taping screws though the rain cap and into the b-vent.

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