The earth is damp, and as the damp soil dries, the water vapor flows upward into the house by what is called the Stack Effect. A house’s natural tendency is to draw air in from the crawl space and lower levels, and then upward into the living spaces.
Building scientists say that 30% to 50% of the air you breathe on the first floor is air that came from the crawl space.
Therefore, whatever is in your crawl space air is in your house and affecting you. If there is mold in the crawl space, there are mold spores upstairs. If there are damp odors in your crawl space…you guessed it…there are damp odors upstairs.Previously the tactic was to add vents to a crawl space with the idea that air will flow in through the vents on one side and out through the vents on the other side. These vented crawl spaces, instead of becoming less damp, end up being more wet. Rather than letting moist air out, a house sucks moist air in, and then up into home!
Air that flows in through the crawl space vents brings its moisture with it. When air is heated or cooled, its relative humidity changes. The relative humidity of air goes up by 2.2% for every degree we cool it. Crawl spaces are cool due to the earth averaging a temperature of 55 degrees year round. When warm humid air enters into a crawl space, the air is cooled, and the relative humidity goes up. This high relative humidity leads to sweating HVAC ducts, mold, rot, and energy loss.
To eliminate your vented dirt crawl space from having any negative effects on you home.
1. Fix the ground water leakage.
2. Isolate the house from the earth.
3. Seal the vents and other outside air leaks.
4. Condition or dehumidify your crawl space air.
The CleanSpace® System meets all the criteria for fixing your dirt crawl space.
