Vinyl floors and water do not mix. Anytime there is a flood on vinyl floors water will always get under the vinyl. There is no way to detect this unless you have a moisture meter. If water is left below a vinyl floor mold will grow. The paper on the back of the vinyl will feed the mold and if laid on OSB or plywood the problem will not go away. Call H2O Drying Solutions for professional service at 1-877-251-1752