High relative humidity cause condensation to form over everything in the crawlspace. Fungus grows on floor joists, and rot begins.
When the relative humidity reaches 100%, the air is holding as much moisture as it possibly can at its current temperature.
As humid summer air enters the cool crawlspace and the relative humidity rises, this can easily happen. Any extra moisture in the wet air is left on the floor joists, insulation, beams, floor, and anything stored in there
Any organic surface will quickly be covered in mold and rot, and mildew will form wherever it can. As mold grows, it will send millions of spores into the air. Insects such as termites will enter the basement and feed off the rotting wood.
Rodents move into the home and feed off the insects as well, creating an even larger problem. Dust mites live and thrive in the humidity, sending their fecal matter into the air.
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