Keep your boat Dry
Controlling mold growth on your boat
I saw Dave reading the electrical meters yesterday and we got to talking. He told me that some boat owners are running space heaters 24/7 to control the mold in the cabin. A few years ago I ran a series of experiments to find a way to control the mold on Papoose, my 36 foot wood sloop. The mold was so bad it was literally eating the hats I hung up below. When I opened hatches, water would be dripping from the cover. The boat was wet. This is the shortened version of what I found. The longer version is on my website. http://L-36.com/humidity.php
First thing was to get rid of the mold. I literally brought a hose below and hosed off everything, and I mean everything. Then I donned a gas mask and sprayed a diluted bleach solution on all the hull surfaces, then washed that down. That got rid of the mold on the hull. Next was figuring out how to keep it gone.
Probably the worst thing you can do is seal the boat up and heat the air, which I tried as one of my experiments and what some people apparently are doing according to Dave. Hot air holds more moisture than cold air and mold loves hot air. There is a theory of sealed spaces that says basically they will suck moisture out of the outside air until the inside air is at 100% humidity unless they are hermetically sealed, which is impossible on a boat. I can't explain that theory but basically it leads to two solutions to keeping moisture out of the boat.
The most effective thing you can do it seal the boat up and run a dehumidifier. That will remove the moisture from the air and with a hose to the sink, get it out of the boat. That is not what I did. This is probably the only solution if you live in somewhere like Florida where it is hot and humid but that is not the case where here in California.
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