Once you have treated it you can do what you like with it. Cover it or leave it as you wish. However you need to check if it is 'live' before going to the trouble of treating it. If you find little piles of sawdust (frass) below the holes in undisturbed areas then this is a sure sign of 'live' woodworm. If you have woodworm on floorboards there is a good chance that the joists supporting them will be infected. I would also check other woodwork in the house - including the roof. Good luck - Ian