We can use the lever principle to tear off old floor boards during apartment renovation. Place a block of wood under the slightly raised end of the board. Strong foot pressure on the raised end of the board will tear it away from the joists, to which she is nailed. As the block is torn off the joists, evenly move the block closer and closer to the nailed end. With this peel-off method, the board is generally not damaged and may be suitable for other jobs.