Our old house is unsheathed and was poorly insulated with blown-in before we bought. Now, we suspect due to the rotting lower edges of siding and peeling paint, that the previous insulation got wet, slumped down at the bottom like a soggy towel and now keeps the north side of the house too moist to hold paint and rotting at the bottom.
So, we are going to carefully peel off each board, hopefully salvage most, and clean out the wall cavities before insulating, sheathing, and re-siding.
Should we take this opportunity to treat our wood with borate spray and further protect the house's frame from damage?
Or will treating the wood result in damage to our plaster--say if there should be some overspray to the wall?
If there is any evidence of termite damage or no record of termite treatment within the last 10 years. Then get the ground treated around the entire perimeter of the house. Good Termite treatment companies can be hard to find so do your homework.
I am not sure what you mean when you refer to "insulating Sheathing"? I hope it not foam board as that will create more moisture problems. Old time but still good protection behind the siding- 30# roofing felt.