Here, where the humidity is 90-100% for over half the year and so mold is routine, people have various solutions. I was surprised to find a neighbor also charring
wood (with a
dragon torch, as I have) to keep mold from growing on it. He was using natural wood, I was using lumber. Is there merit to this approach?
And while reading about beeswax, I had a thought. If it naturally suppresses mold, why not char-finish your exposed wood, then lightly coat it with beeswax while it's still hot? Just rub the bar on the
heated spot. Obviously, it can't be in a spot where rodents can get to it. In late winter beeswaxed wood must be like buttered bread!
I've been treating mold with Concrobium mold killer then painting with Kilz, but it'd
be nice to crib together some less manufactured method...or revive a traditional method. Concrobium, I hasten to point out, has as its active ingredient sodium carbonate, that is, washing soda. At $30 a gallon, I've wondered if I can't just make a solution of washing soda and apply that. I'll probably try it on some uninhabited outbuilding and post results.