I have been reading this forum for months but have not found the solution to my situation so Please help!!!
DETAILS ON HOUSE/CRAWL SPACE
1. Thirty year old house with 5 vents located on the back fifth of the house only.
2. Crawl space height is about 3 feet where the vents are located & gradually tapers off to about 1 1/2 feet in the back third.
3. During heavy rains water runs into the crawl space on the back side of the house only. It starts coming in about half way back of the house & only wets about 3-4 feet into the crawl space. I made a small trench under the plastic to channel the water more directly into the sump pump. The sump pump is located just inside the deepest end of the crawl space where the vents & entry to the crawl space is located.
4. Four mil plastic is on 90% of the ground except for the last part which cannot be gotten to easily even if laying on back & scooting. Plastic recently put on the inside of the brick foundation wall the whole length of the house on the side where the water comes in & earth touches the outside of the brick foundation. I just noticed moisture behind this plastic last week.
THE PROBLEMS ARE
1. Last spring during heavy rains & high humidity I noticed insulation sagging close to the exit of the return air duct to our heat pump. I poked a hole in it & water came streaming out. Also had dripping condensation on the rest of the insulation on the return duct & the round duct work toward the vented end of the house. Moisture was sitting on the pink insulation between the floor joists as well.
2. Occasionally have musty smelling air coming into the house. No mold on coils etc & drains well.
3. Checked last week & still have condensation dripping from duct work but not as bad but I realize the amount is based on how much humidity is entering through the vents.
Don't want to close the vents because during heavy rains some of the water running into the crawl space ends up on top of the plastic until the sump pump gets rid of it.
..... Advice received from NON HVAC people..........
1. Tear off all the insulation & leave metal duct work bare allowing the condensation to evaporate faster. Otherwise constant moisture in the insulation COULD CAUSE IT TO MOLD??? But won't this result in more moisture on top of the plastic?
2. Have vent fans installed in some of the vents to pull out musty humid air out of the crawl space. Or will this just pull more humid air INTO the crawl space through the side vents? If done I'm thinking they should be installed at the END of the house so as not to pull humid air through the side vents. I have temporarily placed a fan in the entrance pulling musty humid air out.
3. Have all of the duct insulation torn off & replaced with no gaps in insulation.
> > > > > I have/am cleaning up what mold is on the floor joists. I have lessened the moisture amount with the sump pump & plastic. Now I NEED TO KNOW is there anything else I can do to minimize the moisture problem which may keep the mold from reoccuring.
I like the idea of the vent fans to help with ventilation so I would like some feedback especially on them. If vent fans are not recommended, what about a crawl space dehumidifier? > > >
To anyone who reads this & is willing to help this southern belle I thank you. Location is central Kentucky