Overhead Support Beams and Ducts
Tip 12: Boxing around overhead ducts and beams
1. Using aviation snips, make a straight vertical cut on the web of the main beam 1/2" from a cross tee slot. Do not cut through
the bottom flange of the main beam; this flange will act as a hinge.
2. From the straight cut on the main beam, measure a distance equal to the required drop in the ceiling level. Here make two
45˚ angle cuts on the main beam. Once again, do not cut through the bottom flange of the main beam.
3. Insert cross tees into top slots.
4. Attach grid wall molding to the outside of the bottom bends, using sheet metal screws or pop rivets.
5. Install vertical ceiling panels. Hold the vertical panels in place by drilling or punching a 1/8" hole in the main beam
1/2" above the flange. After working the panel into position, use hold-down clips or slide an 8- or 10-penny nail halfway
through the hole to hold it in place.
NOTE: As an alternative, the dropped section of grid can be fastened to the main ceiling by using wall molding instead of bending
1. Snap a chalkline across the face of the grid to locate where the molding will be mounted.
2. Attach the molding to the face of the grid using pop rivets or sheet metal screws.
3. Rivet or screw the drop portion of the soffit grid to the molding. The drop grid is bent as indicated previously to form
4. Rivet or screw the wall molding to the face of the bottom corner. If the dropped portion comes back up on the other side, repeat the process.