Keeping a sealed crawl space dry during construction?
While my home is being built, I am having condensation issues under my Advantech subfloor in the sealed 4 foot crawlspace and it is starting to produce mold. Since it is winter, I cannot run a dehumidifier under there, certainly not at night because it just freezes the coils in the dehumidifier, but sometimes during the day I can run it if its a warm day – but that isn’t nearly enough to keep this from happening.
Right now I have run an extension cord in to the crawlspace and am running a series of high velocity fans to keep air circulating down there, as well as to bring in fresh air from the access hole in the floor (which is how I get down there)
I’m spraying white vinegar on the bottom of the Advantech to fight the mold, but obviously this does not solve the moisture issue causing the mold in the first place.
What can I do to help this situation while the house is being built? I won’t be in the dry for another month AT LEAST, and even after that I won’t have the place conditioned using its own electricity and furnace until probably summer of 2020 sometime.
What should I do?
By the way, for more information, the entire crawlspace floor is sealed concrete with a vapor barrier under the concrete and the stem walls surrounding the crawlspace are 4 feet high. I do not have any insulation down there yet, but am planning to do 2 inches of closed cell spray foam at some point at all the rim joist bays and the entire stem wall.