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Wood floors are usually a simple matter. You nail 3/4-inchthick planks or hardwood strips to a sound, dry, level subfloor, then hire a reputable sub to sand and finish them to perfection. When circumstances permit, this is the best option. That's because a solid wood floor is more than a covering. It adds strength to the floor system, and can be repeatedly refinished. But solid floors have limitations. For instance, what do you do if you've got a below-grade or concrete subfloor that might subject the hardwood to high humidity? Or a floor height that doesn't permit underlayment? Or a project that's too small to interest a sanding sub? Or a