Instead of having to cut flashing materials yourself you can buy a fitting boot for your chimney pipe.
Steel roof flashing around chimney.
The bent edge should fit around 1 corner of the chimney.
Cut two opposing 45 degree notches into z closure to allow a 90 degree bend.
These work better on smaller round chimneys and may be ideal for a stove chimney in a metal roof.
A silent movie about flashing a metal roof into a brick chimney from unioncorrugating.
A different type of flashing is a chimney pipe boot.
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.
Trim panels to fit around the chimney.
Use tin snips to clip the flashing at the point where the other side of the chimney lies against the flashing.
Panels above the chimney should be removed.
Ensure that the nails are spaced evenly.
Cut the side cap flashing to fit the angle of the roof so it overlaps each lower cap flashing at least 2 in.
Pound the flashing into the grooves and fasten with the drive in expanding anchors.