I have a flooring issue that needs some attention!

Darco is the stuff that looks like tarp material, looks like it's woven with polyethylene strands. Coroplast is the rigid covering that they used for "enclosed underbelly" trailers, it looks like plastic corrugate cardboard, or a kid's science project exhibit board. Ditto on the Gorilla tape, it works the best that I've tried.

While you're under there make sure you don't have any leaks in either the plumbing or the drains...make sure whatever got that wood wet won't ruin the new stuff.