How To Flash A Metal Roof Chimney

Trace the outline of the base of the rubber boot onto the metal roof with a pencil.

How to flash a metal roof chimney.

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

When installing a chimney for a wood stove on a metal roof you ll first need to assess the position. Pan flashing should extend at least 12 inches up the roof plane. 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. Pound the flashing into the grooves and fasten with the drive in expanding anchors.

Remove the rubber boot. Place the step flashing over the caulk and onto the chimney. Apply sealant to sidewall flashing where pan flashing tabs will overlap. Rivet the pan flashing to the sidewall flashing.

It is a time consuming process. 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. Place a small drop of caulk where the roof and chimney meet at the chimney corner.

Drill a small hole in this spot to mark the chimney s center. A do it yourself video detailing step by step how to flash a chimney with our metal roofing chimney kit. 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. Set the flashing aside.

Flashing the area of a chimney with a rubber roof system is very tricky. Trim the flashing in the center of the rubber boot with a roofing knife so it fits snugly around the pipe.