Replacing old Tongue-and-groove boards If your floors are tongue-and-groove boards, it's necessary to cut through the board joints to release them from their position. (A circular saw is recommended for this.) -Lever up the broken board, using a pry bar (Be careful not to damage the non-damaged planks.) Remove the tongue from the new board, using a sharp chisel It is simpler to replace square-edged boards than tongue-and-groove boards, since