Remove the damaged tiles and any insulation. Be sure to wear protective eye wear and clothing because some of this material contains irritants. In addition, older tile may contain mold and other allergens. Dispose of them properly.
Examine the grid in which the old tiles were hanging. The framework is lightweight metal and may be bent from age, improper installation of tiles, or other factors.
Remove and replace all worn and damaged grid pieces. If the grid is very old, new parts may not fit properly, especially any clips that snap the grid together. Ensure that any replacement pieces will fit into the installed grid. Cutting the ends of new cross pieces at an angle will help them fit between the main runners more easily.
Install new tile into the grid. With the new designs and finishes available, this will give your room a modern facelift. You may have to cut tiles to make them fit near walls. In this case, use a very sharp utility knife to cut them so that the edges are not jagged. Measure exactly and cut carefully.