I have an 8' rim joist and sill plate that is rotted about 4' from the corner of an 8x12' addition on my home due to water damage from what appeared to be a water line/washing machine leak that was neglected by the previous owner. Corner has begun to sag ~1/2-1". There is a support beam running perpendicular to the 12' floor joist 6ft from the rim joist, but does not extend to the outer floor joist. The Outer floor joist is rotted ~5ft from the corner. How should I go about replacing these. I know i'll have to support the roof from the outside to replace the rim joist and sill plate but should i replace the outermost parallel floor joist first and what would the easiest way be to go about doing this. I will also be replacing the sublooring which consists of 1/2"plywood, 3/4" tonge and groove overlaid with 1/2 plywood. Ill try to post pictures when i can. Thanks for any help.