I am installing tile in hallway. Need to cut through the backer board that extends into the laundry room so I can take up hall old floor. Cut will be made between door jams. Laundry floor will remain. What is best tool to make the cut so I only take up what is in the hall. Hope this makes sense. Pre-Thanks to any and all who answer. The board is a 1/2 pressboard with linoleum on it.