How To Flash A Metal Roof Chimney

Cut a piece of prebent base flashing to fit across the front of the.

How to flash a metal roof chimney.

Use metal screws or nails to hold the overlaps together then apply caulking material on the seams to seal them off. If you install a number of flashing segments you need to overlap these segments at about 4 to 6 inches from the previous sheet to prevent gaps. Cut two opposing 45 degree notches into z closure to allow a 90 degree bend. Place a second piece of 8 inch 20 3 cm flashing against the chimney.

Pry chisel and scrape off old metal flashings and roofing cement. Place a small drop of caulk where the roof and chimney meet at the chimney corner. Fold closure 90 degrees and. Hammer 2 roofing nails into the flashing and roof.

Install front base flashing. Bend legs up the chimney sides about 1 inch. Installing chimney flashing gather all materials first then remove old flashing. Place the step flashing over the caulk and onto the chimney.

Slide the rubber boot over the pipe to check the fit. Secure a shingle over the corner flashing using a hammer and roofing nail. 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. Trim the flashing in the center of the rubber boot with a roofing knife so it fits snugly around the pipe.

Panels above the chimney should be removed. Remove the rubber boot. Trim panels to fit around the chimney. 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.

Apply butyl tape to the underside of the closure.