If not in a leaking boat, most of the moisture condensing under the matresses comes from our bodies. An alternative solution to perforated boards or slats is to stop the moisture from entering the matress at all by glueing a thick polythene foil of the type used to protect floors and furniture during painting or other reconstruction activities to the upper surface and sides of the matress.
The matress stays bone dry and as an added bonus, the covers are now much easier to pull on. You may think it would make the bed
feel clammy particularly in hot weather
but it actually felt drier than before. The only negative side effect is a slight crackle when you move in bed
but I forgot that almost immediately. Use water
based contact glue to prevent eternal solvent stink.
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