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I have a 15 year old log cabin with a couple of rotten logs (powder post beetles). Need advise how to replace "D" faced logs without house falling down. A second story (wood frame and vinyl siding) was added later. Any ideas or helpful suggestions?
If the rot doesn't go all the way through, then you can dig out the rot, fill in with 2x and put a new face on the log. Fill in any hollow spots with a closed cell foam before putting on the face board.
Treat all the logs with a product called Timbor or Boracare. The Boracare is quite expensive, but you should be able to cover the whole house with one gallon of concentrate. You use a common garden sprayer to apply. If you use the Timbor, you have to mix it yourself but its a lot cheaper. it works best if mixed with ethylene glycol antifreeze, then dilute with water and spray. The Boracare is essentially Timbor and antifreeze.
Google Timbor for directions and sources.