How To Flash A Metal Roof Chimney

A do it yourself video detailing step by step how to flash a chimney with our metal roofing chimney kit.

How to flash a metal roof 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. Hammer 2 roofing nails into the flashing and roof. Fit an 8 inch 20 3 cm piece of square step flashing over the chimney s front corner. Cut and fold pan flashing to fold up the back of the chimney and over the sidewall trim.

When installing a chimney for a wood stove on a metal roof you ll first need to assess the position. Pound the flashing into the grooves and fasten with the drive in expanding anchors. Rivet the pan flashing to the sidewall flashing. 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.

Flashing the area of a chimney with a rubber roof system is very tricky. 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. Place the chimney where it would be related to the stove and mark the center of the chimney on the ceiling. Trim the flashing in the center of the rubber boot with a roofing knife so it fits snugly around the pipe.

Apply sealant to sidewall flashing where pan flashing tabs will overlap. Install two layers of butyl tape sealant under perimeter of pan flashing. Slide the rubber boot over the pipe to check the fit. Pan flashing should extend at least 12 inches up the roof plane.

Remove the rubber boot. Set the flashing aside. Cut the side cap flashing to fit the angle of the roof so it overlaps each lower cap flashing at least 2 in. Place a small drop of caulk where the roof and chimney meet at the chimney corner.

It is a time consuming process. Place the step flashing over the caulk and onto the chimney.