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 where siding meets brick.
What was suggested about the return is the right way or you cantilever that wall out about a foot over the brick.
Thats why most brick houses you see have a hip roof or a full gable end where the brick runs up to the peak.
Maybe in this case the flashing extends upwards behind the building siding forming a zee shape that might reduce this risk.
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.
If the transition exceeds 10 feet in length it s necessary to use more than one piece of.
Install the flashing before you finish the top of the brick wall as the flashing must go behind the siding as well.
The nails holding up the siding should not be caulked.
There should already be a metal flashing that is sealed to the brick.
It might be buried behind the siding where you can t see it.
Details like this risk rot and insect damage to the structure.
The metal flashing placed on wall top slopes back towards the building directing water inside the structure.
How to use flashing between brick siding 1.
I ve read the following sections of ubc that seem to indicate a need for flashing between the brick and hardi siding trim band.
But with a step back you don t want the brick all the way up to the peak and then sitting on the setbacks roof.
Run the l shaped flashing up under the bottom row of siding so that it tucks under the final bottom row and on top.
Metal flashing or any metal to wood joint should not be caulked another water exit pathway that should never be sealed.
Uniform building code section 1402 2 exterior openings exposed to the weather shall be flashed in such a manner as to make them weather proof.
Install the kickout flashing.
Also avoid caulking tongue and groove siding boards together.