Architectural Advice Sheet - Accordion Partitions
Proper Wood Headers for Accordion Partitions
The wood header that you will be providing for the accordion partition(s) should:
- be installed in a level orientation both in length and crosswise.
- be installed with the bottom surface at precisely 1 3/4” above the finished ceiling elevation.
- be installed with its centerline exactly on the centerline of the accordion partition.
- be designed to ensure that it will support the anticipated weights of the stacked and extended accordion partition.
- be hung with threaded rods that are located in pairs along the length of the header. The first pair of threaded rods, on each end of the header, should be located not more than 3” from the end. At the “stack” end, for the next three feet, the pairs of rods should be at 1’-0” apart and at 2’-0” on center thereafter (if the accordion stacks at both ends then the 1’-0” spacing for the first three feet should occur at each end.
NOTE: The ideal header is built from 2 layers of 3/4” plywood glued and screwed together with offsetting joints. If dimensional lumber is used instead, it should be 2 layers of 2 X 6 or larger. Treated lumber should not be used due to its tendency to twist. Fire Retardant plywood can be used if non-combustability is an issue. A plywood header will give the good flat and secure base for the track attachment and is far less likely to shrink or warp. For the Hufcor Wall accordions a 10” wide header is sufficient. The pairs of threaded rods that support the header should be a minimum of 5” across from each other and a maximum of 8” across from each other. The pairs of threaded rods should be no further apart than 24” along the length of the header with that spacing reduced to 12” in the stack area. The header should be supported no further than 3: from each end. The threaded rods can be used to bring the header into a level orientation in both length and width. After the header is placed at the proper elevation and leveled, the excess threaded rod that protruded below the nut at the bottom of the header should be cut off to prevent interference with the track and ceiling.