A nice sharp blade that holds an edge is key here.
Best way to cut drop ceiling tiles with a reveal.
Pull the straight edge back about 1 2 inch and cut the vertical portion of the tile reveal.
Measure the location of holes required in the tiles such as those for lighting or air vents.
Pull the knife down along the side to remove the edge of the tile and create a shadow line.
Cut the side of the tile to finish making the shadow line.
Place your free hand flat on the tile s surface for support.