The solution to rotting sidewalls is a small piece of bent metal called a kickout flashing at roofing suppliers which simply directs all that water away from the wall.
Flashing a fieldstone chimney along siding.
Some take shortcuts causing loose foundations or cracks in the chimney after only a few years.
Slide the prebent and soldered chimney saddle into place behind the chimney.
Seal the sides of the chimney with prebent pieces of step flashing under each course of shingles photos 4 and 5.
Each leg should be about 6 in.
On each end of the pan flashing cut about 1 1 2 in.
Using the grind and tuck technique grinding the mortar joints bending the metal along the top of the flashing and tucking it back into the mortar joints.
Gaps between the house siding and chimney may need new flashing.
Kickout flashing installs just like standard step flashing except that half of the kickout flashing hangs over the edge of the roof.
The first part is a one piece pan that is bent at a right angle and laid with one leg against the chimney and the other on the roof.
Outdoors inspect the chimney for small bird or wasp nests and weeds.
This also is a good time to check for areas that need repair.
The first is called step flashing.
And more often than not the culprit is the flashing the sheet metal that keeps the intersection between the chimney and roof watertight.
Pieces of 18 inch wide flashing installed prior to the brick work but on top of the house wrap in a stepped fashion periodically laying on top of the lapped upper portion of the siding to get the water back to the exterior of the wall is more along the lines that i would be thinking of.
Proper flashing around a chimney includes two layers.
Along the bend at both ends so that the flashing bends around the chimney at the bottom and overlaps at the ridge.
Feazel craftsmen deliver the utmost attention to detail.
Nail it to the roof along the top edge.
Install the kickout flashing.