New answers tagged moisture
To make long story short from what I see my best guess is that you have condensation issue. Most likely since your pump is in the corner there is somewhere thermal insulation missing and since you said that there is draft that means cold air is coming inside. Where from?.... I cannot be 100% sure. My money would be on the wall because most likely places ...
Use a combined moisture & sound deadening barrier like Roberts Unison 2-in-1. I put this under my engineered bamboo floor. It was an easy install and works great.
You can either vent straight out or through your roof. I don't know exactly what is above your fan but I will assume it is finished space and you are venting through the side. In order (and note giving advice without pictures): Figure out which way the joists are running above the bathroom. You will be venting out which ever way you can run parallel to ...
Try a tanking slurry product like KA tanking slurry , uselly used in basements, brushed onto the concrete floor. The correct method as previous poster mentioned would be to remove the concrete floor and install a proper dpm.
This is related to your question, but something I felt like commenting on: since your CMU exterior walls are covered up with vinyl siding, you have a perfect opportunity to insulate your house, which should give you quite a lot of bang for buck given that it currently has none. Remove the vinyl siding (carefully), cover the CMUs with 3+ inches of rigid foam ...
Other than taking a jackhammer to it and doing it right from the bottom up, (or turning it back into a carport): Lay 6 mil plastic in a continuous sheet, place 1 or 2 inches of XPS rigid insulation sheets, pour 2" of gypsum cement (might as well place radiant floor heat tubing while you are at it, even if you don't have immediate plans to use that.) A ...
There should be a vapor barrier to all exterior/cold areas. Seal and tape all wall/ceiling interfaces. The plastic should be 6 mil thick.
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