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Vented and dirt-floored crawl spaces are notorious for presenting high humidity levels and numerous amounts of moisture related problems that when left untreated can compromise the structural integrity of the building.
In this video, Simone helps a customer from Long Beach, NY understand how moisture gets into the crawl space, and the four mains steps that need to be taken to control it.
The first step is to provide adequate drainage so that water won't be pooling at the floor.
The second step is to stop air flow from the outside by closing the crawl space vents. Modern building science has proven that the vents that were originally designed to help keep the crawl space dry are actually responsible for bringing in moisture from the outside air. During the summer months, that moist air cools down when it enters the crawl space. Relative humidity levels in the crawl get higher, above 60% which is the level needed to support mold growth -- and often above 100%, at which point condensation occurs all over the cold surfaces of the crawl space.
The third step is to completely isolate the crawl space from the dirt floor and outside air by lining the entire space with a sturdy vapor barrier, and sealing it.
The final step is the installation of a dehumidification system. Bill and his team at Healthy Basement Systems preferably install the SaniDry Dehumidification System: an energy-efficient dehumidifier that once installed will effectively monitor and control humidity in the crawl space, self-emptying into the drainage system so you will never have to worry about emptying a dehumidifier tray.