How to Install a Collar on a Metalbestos Chimney

A Metalbestos chimney is a brand of insulated, double-walled pipe that takes the place of a stone, brick or masonry chimney. The metal pipe is insulated so it can be installed through walls and roofs without creating a fire hazard. The collar is installed on top of the roof where the chimney protrudes. The collar helps to stabilize the chimney and also diverts water away from the chimney base to reduce the risk of leaks.

Roofing tar
Tin snips

Instructions

- 1
  Slide the collar over the top of the chimney on the roof. Slide the collar down the shaft of the chimney to the roof surface.
- 2
  Apply a bead of roofing tar to the underside of the chimney collar. Bend the shingles above the chimney on the roof surface up slightly and slip the rim of the collar underneath them. Apply another bead of roofing tar to the underside of the shingles. Press the collar down against the surface of the roof and the shingles down on top of the collar. Trim the shingles to conform to the circular base of the chimney collar with tin snips.
- 3
  Seal any visible joints between the chimney collar and the roof with more roofing tar.

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