If you are going to renovate (or cover) a damaged floor, I would
suggest that you lift a few boards & take a good look underneath
first. Look for:

damp, rot, leaking pipes, bad wiring, rubbish (this might bridge
the DPC), insects, blocked ventilation. If the U/F void smells
fusty, this might mean dry rot.

Are you likely to want to lay cables for computer, phone, etc?

Then tread over all of the old floor: are there any boards
that creak? Does the skirting board need painting?