Did a quick look on Amazon Den dry Mattress Underlay-Queen $99.
But before that I would use Concrobium or other product and kill all the mold. Then use a waterproof paint or one with mold prevented in it or added to it and see if it comes back. Plus, of course, insulate under the wood to prevent moisture coming through or gravitating to the cold area.
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6
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