The rim joist on the front of my house has water damage and needs to be replaced. When I pulled off most of the rot, less than half the board's thickness remained. The floor is cantilevered about 3 feet. The joist is a 2x10 about 13' long. I originally was going to sister in a replacement for the damaged area but my neighbor (a city inspector) said that if it were his house, he'd replace the whole board. And since I have the entire board exposed right now anyway, I figured I might as well. What I don't know is how be sure the house doesn't shift while I replace it.
I haven't noticed any dip in the floor inside. There is nothing especially heavy in the bedroom over the cantilevered area (no piano or anything like that).
I was thinking I'd put temporary 2x10 blocking between the floor joists and then pull out and replace the rim joist. Is that safe or do I need to somehow put the floor on jacks? Can I also replace the rotted section of the bottom plate at the same time?