EP30: Deadrise Disaster - Scrap-it and Rebuild or Salvage? 

Brother, I'm in the camp of "this is ok." It will dry, and the mold will not have chance to further propagate when that happens. It will also (probably?) all be covered with epoxy and/or paint in the end, sealing off any mold/mildew. If possible, yes, what everyone said about allowing airflow under the enclosure and between wood surface/plastics will be best! I, personally, wouldn't even bother with dehumidifiers; airflow will likely solve the problem. For a dehumidifier to be effective, it will need a completely sealed envelope, including the earth (an infinite supply of moisture... like running an air conditioner outdoors).

My guess is the moisture is coming from the ground. My greenhouse does the same thing (which it should).If you can cover the ground with plastic under the frame it may solve your issue..

heart breaking - sorry to hear

I panic about my build being outdoors all the time, but you're good. This is okay.

I had the exact same problem you are having. I solved the problem by covering the boat with fabric car or truck covers,followed by plastic over that. I also ran a rotating fan within the enclosure. Problem solved.

If you get some dehumidifiers you can set them under the tarp a check daily with a moister meter you can absolutely dry it out may take few days then treat the growth with an anti fungal like ON & GONE

First try to let it dry by ventilation, a little black streaks are not that bad for the wood/construction.

Disheartening. I would be tempted to disassemble the frames and store inside until you can make a fresh start. the mold must be able to be treated by a bleach/chlorine product?

Definately not an expert but........i assume before long in your area it will be constantly below freezing and the moisture problem will go away. Until then can u dry with a fan underneath the plastic? Is it possible to seal enough to use an ozonator in the spring to take kill mold?