What is the minimum clearance needed to suspend a 2x 2 or 2x 4 ceiling?
3″ from the hard surface of the plenum to the face of the grid, is the minimum for a 2′ x 2′ and 2′ x 4′ panels. It is not only a matter of getting the boards in, but the installers need room to twist the hanger wires, etc. Fiberglass is, of course, easiest to work with in the minimum clearance situation. Where necessary, 2′ cross tees can be left out to accommodate panel installation and then put in. More clearance should be given whenever possible to make the installation easier.
