Floodproof Subfloor. Tapered edges help PointSix Flooring go down flat and stay flat even when exposed to severe job-site weather or flooding, says the maker. All four sides of the subfloor panels are factory-milled to create a slight recess at the points most vulnerable to swelling. If the floor gets wet, the wood fibers expand just enough to flush out the gap. According to the company, PointSix costs about the same as competitive OSB subflooring. Ainsworth Engineered Canada LP, 877/661-3200, ainsworth.ca.