Crawl space vapor barrier without encapsulation
I’m having issues with my crawl space, including standing water, sweating ducts, and minor mold. I’ve since installed a sump pump, covered the vents with plastic, and put in a temporary dehumidifier. I was going to have my crawl space encapsulated, but it’s quite expensive, and I don’t have time to do it myself. So now I’m considering doing the following instead:
1. keeping existing ground vapor barrier
2. keeping my existing fiberglass batts
3. re opening up the crawl space vents
4. adding a new vapor barrier to the walls
5. taping up all seams in the vapor barrier
I’m wondering if this will be enough to control the humidity in the crawl space? My rationale is that my vented attic’s ductwork is exposed to outdoor humidity, and I don’t have problems with sweating ductwork there. So if I keep ground moisture out of my crawl space then that could be enough.
I could keep the crawl space vents closed. I feel like it needs some ventilation though for indoor air quality purposes, especially with the fiberglass batts staying in place. My vents automatically close in high temperatures and close in cold temperatures. So there would be reduction of air movement on hot summer days.
I live in climate zone 4 in Nashville, TN. Also, I live about 30 feet from a drain easement, not sure if that proximity will also affect humidity levels.
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