Snap-Together Subfloor. Barricade SubFloor Tiles combine a high-performance OSB top surface with an XPS rigid insulation base layer. The 1 1„8-inch-thick 2-foot-by-2-foot T&G panels install without nails or glue and have an R-3.2 insulation value. Channels in their bottoms direct moisture to a floor drain. Compatible with vinyl, carpet, laminate, and engineered hardwood flooring, the tiles sell for $7 to $8.50 each. The company makes similar panels for finishing basement walls. Ovr Manufacturing, 866/544-6879, ovrx.com.