Before you work on a ceiling that old contact your regional epa office state environmental office or local health department for advice on testing and handling.
Replace single ceiling tile.
Unlike drop ceiling acoustic tiles that fit into a suspended frame most interlocking tiles are mounted on the ceiling with nails staples adhesive or a combination of the three.
The replacement tiles have two sides with an extended lip for stapling to the framework as well as a recessed groove for the lip of the tile next to it see first photo below.
If they re glued directly on it will take some extra effort to remove them.
We simply removed all tiles in that corner to install replacement tiles.
If your grid holds 24 x 48 tiles try a scored product that s designed to look like 24 x 24 panels.
With this style you won t need to purchase additional cross tees just pop out the old ceilings and place in the new.
For a quick update pop old tiles out of the ceiling grid and replace with fresh ones.
Use a utility knife to score the tiles then a putty knife to loosen and pull loose a tile for inspection image 1.
Investigate how the ceiling tiles are attached.