Answer:
The best protection will be to cover the walls with tempered glass walls to shield them from getting any moisture. (Just kidding…sort of. Keep reading.)
Let’s start with the basics: invest in a great exhaust fan (if the shower is indoors) and some highly absorbent microfiber towels that can be used to dry.
Multiple coats of a very moisture-resistant polyurethane will help, with an extra maintenance coat applied every 6 months to a year, or any time it looks like the logs have moved enough to crack the coating. Poly’s are very hard and logs move a lot, so you have to watch continuously and carefully for tannin staining (water damage) and act quickly to repair the coating whenever that is seen.
Additionally, we’d recommend you install a copious amount of CobraTM Rods. CobraTM Rods are what they use in the utility poles in Canada. They’re solid rods of borate and copper that do a heck of a job preventing rot. Install them in all log courses and seal with a bit of backer rod and caulking. Apply them from the bottom curvature up into the log to make it less noticeable. Inspect every 6 months to a year with a thin wire to make sure the rods haven’t dissolved. If they have, replace them.
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