Join Date: Nov 2008
Location: Deale, MD
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A nice, simple explaination.
Insulation and vapor bariers aside, in a nutshell you need to start with 2 simple things.
1. Heat the interior warm enough so moisture will evaporate off the walls and "float around" in the air. The walls will appear dry but the moisture will still be in the air. Hopefully your heaters will have fans to move the air around, and hopefully they are safe. (I personally dislike electric heaters on a boat for safety reasons).
2. Use a dehumidifier to capture that "floating moisture" - read the instructions that come with the DH as to what happens when the interior is not warm enough.
Then save up for a diesel hot air furnace.
I'll add to it:
3. Ventilation also "dries" the air if heat is in use; the colder exterior air is always drier because it is cold and cold air holds far less moisture. Houses generally ventilate through leakage; boats are much tighter and much smaller. The clothes drier and bathroom fans can also pull a lot of humid air out of a house.
4. Moisture comes from many sources, but the main source for live aboards is exhalation, perhaps 1/2 gallon per person per day. Add to that cooking, showers, and wet bilges.
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