condensation

Even if the cabin is insulated it still has to be ventilated.

The water vapour breathed out has to go somewhere and it will stay in the bedding, carpet, clothing and in the atmosphere of the cabin.

It is one of the great difficulties of living in an unheated poorly insulated small space.

To be in a thoroughly ventilated boat in a very generously insulated sleeping bag or under many togs of duvet with a hot water bottle I've found best.

S.
 
ArthurJStoatfondler said:
No they're pointless unless you seal the boat up and stop outside air entering, in which case you'll suffocate. In normal use they produce lots of water which makes you think they're drying the air. In reality you are like King Canute constantly trying to hold the water back as more enters the boat through the vents.
According to the instruments, the humidity on my boat today is 42%, about right for comfort. Anything less would become a health hazard so, even if it was practical, why would I want to dehumidify? I and probably the OP are in the UK, not the Tropics.
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You think they are pointless. Doesn't make them pointless!!

Im not in the tropics.

Dehumidifiers are great. In my opinion.
 
Should be a good day for it. Don't forget it can be cool on the water at this time of year and also the sun seems to be magnified. Sunscreen and windproof jackets. Enjoy yourselves!
stu9000 said:
Taking the wife and kids for a sail tomorrow. First time on board! Sun set to shine. Its gonna be great!
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Under mattres slats are, we've found, the best thing for allowing mattresses to breath and allow condensation to escape. IKEA do them for their beds: cut them to size to fit your berths and support them on 2 x 1 wood: fix in place with screws if required. Or you can get special ones for boats with patent rubber support for lots more money.
We've tried the open mesh support mats and they're not worth the money in comparison to slats.
 
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