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The room addition was built attached to a basement and had only one access cut through the basement wall. It was built without vents but nothing else was done within the closed space. We installed the CleanSpace vapor barrier and sealed up the inside of the crawl space. The air inside the space is now dry and the vapor barrier on the ground will stop the damp air from the ground from 'leaking' up into the home. There will be less humidity and the environment won't be a haven for spiders, critters, and mold as it was previously.