How To Flash A Metal Roof Chimney

Install two layers of butyl tape sealant under perimeter of pan flashing.

How to flash a metal roof chimney.

Flashing the area of a chimney with a rubber roof system is very tricky. Place the step flashing over the caulk and onto the chimney. 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. Rivet the pan flashing to the sidewall flashing.

When installing a chimney for a wood stove on a metal roof you ll first need to assess the position. Set the flashing aside. Pan flashing should extend at least 12 inches up the roof plane. Trace the outline of the base of the rubber boot onto the metal roof with a pencil.

Cut the side cap flashing to fit the angle of the roof so it overlaps each lower cap flashing at least 2 in. 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. Fit an 8 inch 20 3 cm piece of square step flashing over the chimney s front corner. Slide the rubber boot over the pipe to check the fit.

Hammer 2 roofing nails into the flashing and roof. Remove the rubber boot. Cut and fold pan flashing to fold up the back of the chimney and over the sidewall trim. Pound the flashing into the grooves and fasten with the drive in expanding anchors.

Place a small drop of caulk where the roof and chimney meet at the chimney corner. A do it yourself video detailing step by step how to flash a chimney with our metal roofing chimney kit. Drill a small hole in this spot to mark the chimney s center. Trim the flashing in the center of the rubber boot with a roofing knife so it fits snugly around the pipe.

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. It is a time consuming process.