Wood floors are good insulators
Although not pretty, air-gap wooden tiles, right, offer extreme breathability for concrete floors prone to dampness. The oriented strand board (OSB) tiles, measuring 24x24", have patterned plastic undersides that actually lift the tiles off the floor. Not only does the created space allow the most air movement of any flooring option, but minimal amounts of running water can freely flow underneath. This solution is best for a basement shop or garage that doesn't share space with an auto.
You may have to cut tiles to clear obstacles, but the tongue-and-groove edges make for fast installation. If you'll be rolling heavy equipment around, you may want to add some of the edge tiles to the floor to prevent shifting. Shims are available that fit the patterned plastic on the under-side to level the tiles on uneven floors. The tiles are nearly 1" thick so transition and reducing strips (available at home centers) are required on exposed edges.
The tiles come only one way--bare wood--but can be painted if desired. Or, you may choose to use the tiles as a subfloor for another flooring material to be laid on top. You can find the tiles at many national home centers (one brand name is DRIcore; information at dricore.com), where they sell for about $6 each, or about $1.50/sq. ft. Only paint is less expensive.
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