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Old 08-03-2013, 04:14 PM   #16
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Will vapor diffusion be a factor .it was super moist for a while . And can I get fungi or mold growth from no airflow was so moist before that some of the insulation had condensation before I aired it out/ ac flow either.


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Old 08-03-2013, 05:55 PM   #17
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If you seal the vents and run a dehumidifier. Keep it 55%RH or lower. You won't have a mold or fungi growing problem. Unless its already there.

Some people put a small fan in the crawlspace to move the air around so the air the dehumidifier conditions is spread equally through out the crawl.
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Old 08-05-2013, 12:28 PM   #18
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The air won't be circulated as much with a dehumidifier alone, IMO. If you are showing signs of moisture depositing on the joists now, with vents, closing them will reduce the moisture as well as reduce air currents. The temperature difference between outside air and floor is a major factor; Fig. 3, 4: You need to decide if a closed crawl is for you and act on it after removing other water sources as said.

Closed vents will reduce air movement (ability to transport water vapor), another option is foamboard on the joists to eliminate the condensing surface temperature difference; Fig. 7;

Enter your 55%RH and your floor temp in the graph at Figure "A" to check if safe or not.



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