Replacing rim joists in brick house
Thank you for the responses.
I ran into a bit of good luck and got the rim joists replaced yesterday.
Two things helped greatly.
First, when I removed the rotted out threshold at the french doors, it revealed a large portion of the damaged area of the double rim joists.
Second, there was a space between the joists and the bricks which allowed cutting them with a sawzall.
It could have been a nightmare since the bricks are actually structural. They run from the footer to the eaves. If the damage had been somewhere other than beneath the door, which allowed just enough access, I`m not sure how it would have been done.
As it is, all is well.