Sealing walls and floors with oil paint will help keep moisture from entering. But any leaks or dampness will develop mold behind walls. This is where a moisture meter is necessary to pinpoint bad areas. I keep my basement around 50-60%. If you smell mustiness it is mold even if you don`t see it. If so then killing it with bleach is a good first step, even spaying the walls with a grden sprayer. Test the floor tape plastic to it maybe several ft square if moisture collects you have to fix it first or the carpet will mold. Under carpet consider plastic sheet, it is better than ruining carpet. Cutting in an adjustable-closeable return is good for summer to move moist air out and a closeable supply for winter. It is easier to find and fix problems now instead of later.
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19 years ago