Lift the carpet or lino in an old villa to prepare the floor for polishing and you are bound to reveal the gaps or rotten bits in the floorboards.
So how to get them up and insert a tongue-and-groove board into an existing layout? First, work out where the joists are. If you’re lucky, the piece you want to remove will begin and end on a joist, or at least one end will. If not, find the joist nearest to the point you want to cut, usually by tapping the floor.
Often you will see the old nail holes, a good guide to where the centre of the joist might be. Next, scribe a line across the board you want to cut. I use a Tajima knife.