Remove that, and you would find a subfloor such as oriented strand board (OSB), plywood or concrete. A moisture and/or vapor barrier might be found among the layers too, especially in basement ...
but what about painting plywood sheets or an existing plywood sub floor? Here are some of the best painted plywood floors we could find… Remodelista: When a flooring trend gets a mention on a ...
Description: new construction or shielding upgrade/renovations for P.E.T and other types of diagnostic imaging rooms and to fill the void between lead-lined drywall and interlocking lead bricks.
For example, creaking or squeaking may indicate loose or damaged subflooring ... and under that is plywood. That means you may only be able to refinish it once, maybe twice, over its lifetime.