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Where the mold appears, and how severe the problem is, however, can require drastically different solutions.
Mold and Mildew Below the Deck
Mold that appears on the ground below the deck is a sign one of thing only: too much moisture. It is possible for mold and mildew to accumulate below the deck because it was built too close to the ground, but it’s more likely that water and moisture are accumulating there because of improper drainage or faulty grading. Adding ventilation will help solve the problem if your deck was simply built too close to the ground, as it will allow for trapped moisture to escape. With no moisture buildup, you shouldn’t have any more problems with mold and mildew. If poor construction habits aren’t the issue, then you’ll want to have the situation evaluated by a mold remediation professional. It’s likely you’ll need to either install a drainage system to help remove unwanted moisture, or you’ll need to figure out a way to re-grade the landscaping so water doesn’t accumulate beneath the deck in the first place.
