How To Flash A Metal Roof Chimney

Drill a small hole in this spot to mark the chimney s center.

How to flash a metal roof chimney.

Place the step flashing over the caulk and onto the chimney. Install two layers of butyl tape sealant under perimeter of pan flashing. Remove the rubber boot. Bend a piece of cap flashing to fit around the top corner of the chimney and add the cap flashing across the back of the chimney.

Pound the flashing into the grooves and fasten with the drive in expanding anchors. Place the chimney where it would be related to the stove and mark the center of the chimney on the ceiling. Set the flashing aside. Apply sealant to sidewall flashing where pan flashing tabs will overlap.

In most cases it is essential to use a skilled craftsman to wrap a layer of the rubber material into a step flashing and then counter flash with aluminum or copper. Hammer 2 roofing nails into the flashing and roof. Cut the side cap flashing to fit the angle of the roof so it overlaps each lower cap flashing at least 2 in. Trace the outline of the base of the rubber boot onto the metal roof with a pencil.

As the side base flashing approaches the valley flashing it will have to be shaped to lie in the lower trough section of the roofing so that the second sheet of roofing will lie flat. Cut and fold pan flashing to fold up the back of the chimney and over the sidewall trim. Rivet the pan flashing to the sidewall flashing. Slide the rubber boot over the pipe to check the fit.

Trim the flashing in the center of the rubber boot with a roofing knife so it fits snugly around the pipe. Place a small drop of caulk where the roof and chimney meet at the chimney corner. First fasten the lower sheet of roofing in place alongside the chimney then install the base flashings at the bottom and sides of the chimney. It is a time consuming process.

A do it yourself video detailing step by step how to flash a chimney with our metal roofing chimney kit. Pan flashing should extend at least 12 inches up the roof plane.