Ok, this may be a bit long winded, so bear with me:
I am renovating a house we have recently bought and fixing many many of the previous occupant's 20+ years of "fixes" and additions. The current problem is, he has built an addition onto the house, but the addition is built on top of part of an outdoor deck. Two of the Three walls sitting on this deck are flush with the edges of the decking, but the deck extends under and beyond the third wall. The bottom of this third wall is rotten, most likely from rainwater getting between the deck boards and the wall. I can put some temporary jacks under the wall (bearing the load from the roof rafters) and replace the rotten studs and plate, but two problems still remain that I think I have solutions for and want to see what others think about them:
1) the sheathing looks like it's not in great shape, not as punky as the 2x4's but not great, I'd like to just seal it up with a resin "wood hardener" that is available (I've seen it by Minwax, but I'm sure others sell it too) instead of having to rip off siding and sheathing and goodness knows what else. Anyone ever try this and does it work?2) I'm thinking of cutting a 1/4" or 1/2" gap in the decking flush with the edge of the wall (outside). It'll probably mean having to put a pair of joists on either side of the cut (the joists run parallel to the proposed cut). If I did this, put flashing under the plate, gob the heck out of it with caulk - what do you think?
Thanks in advance for any thoughts/advice.