What's the roof pitch? You really don't need one when properly flashed with a smaller chimney.
If one doesn't do a cricket the water will pond and eventually rust out the metal flashing, won't it?
For the sides I think flashing and counter flashing (step flashing) that goes in the grout joints is the way to go.
I've never heard of copper or aluminum rusting.
I've never heard of copper or aluminum rusting.
No salt here. But when I find steel flashing on roofs it's usually from 2 or 3 roofs ago and still holding fine.
There needs to be a step/ pans attached directly to the roof and separate counter flashing attached directly to the chimney. The reasoning or this: The wood framed roof will move and deflect with weight and temperature changes and the masonry is stable.
Here is a chimney I did. Aside from the flashing and counter flashing detail, notice the drain space between the flashing bend and the shingle edge. This keeps the water flowing down alongside washing dirt and debris away.
The "Tinner ears" move the water past the tiny holes created by the two pieces, caulking blocks those tiny holes that get very little weather/ water.
Do you ever have a problem with Galvanic corrosion ?