I've got to lift a t&g floor to sort out electrics, plumbing and insulation underneath. They're pinned down with the world's grippiest clasp nails and I've finally concluded that I need to cut off all the tongues in order to lift the without splitting too much. What's the most logical way to go about putting them back again...? 1. New boards, at about £500 (it's a big room, about 4x4m) 2. Take the lovely old boards from the room above, because these look nicer anyway, and upstairs could be replaced with cheapo chipboard or something which will be carpeted eventually. 3. Reuse the t&g by putting hardboard (other sheet material?) across the back of 3 or 4 boards at a time, and screw them down, making convenient panels that can be lifted easily for future access to stuff underneath. Currently favouring option 3, but not sure if that's just plain silly...?!