Ranch style home with crawl space in SC along coast that is five years old. This crawl space has 28% moisture readings in two or three areas of the joists. The crawl space has approx. 2,179 s.f. with. The design of house has two long earthen porches on the front and rear of house without any ducting to allow venting to the crawl space. The HVAC ducting is in attic, so this is not an issue. There are no plumbing leaks in the crawl space. As such the house has no crawl space vents on front, six on one end, four on opposite end and six on the rear of house. A building inspector when we purchased the property (three years ago) recognized this moisture problem and recommended vapor barrier (plastic on ground) and two power vents. Vapor barrier probably covers 75% of ground. I have installed a third power vent and moved the power vents to one end of the house, closed all the vents on the end with the power vent and opened all the vents on the opposite end of the house. I was having a problem with high moisture, mold build up on joists in the middle of the crawl space against the walls where the porches are, so I modified the power vents to pull air through the crawl space to avoid those "dead" areas along the porch walls. The power vents move approximately 33,000 c.f. of air per hour. The question is should I cover the remainder of the crawl space with 6 mil platic and have the plastic go all the way to the walls and up them for 6 to 12 inches to help alleviate the moisture problem? Any other suggestions on how to alleviate this moisture problem!
- posted
20 years ago