It is a time consuming process.
How to flash a chimney on a shingle roof.
Secure a shingle over the second piece of flashing with a nail.
The flashing should partially overlap the shingle that covers the first piece of flashing.
Panels above the chimney should be removed.
Flashing the area of a chimney with a rubber roof system is very tricky.
Bend legs up the chimney sides about 1 inch.
Seal the sides of the chimney with prebent pieces of step flashing under each course of shingles photos 4 and 5.
Along the edges or closer if necessary to flatten the metal.
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Hammer 2 roofing nails into the flashing and roof.
Trim panels to fit around the chimney.
Apply butyl tape to the underside of the closure.
Galvanized roofing nails about every 6 in.
Nail it to the roof along the top edge.
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.
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.
Secure a shingle over the corner flashing using a hammer and roofing nail.