TM 55-07/NAVSEA OP 3221 Rev 2
b. Nonheat Bulkheads. Nonheat bulkheads are constructed in the same manner as the heat bulkheads, except
that the boarding need not be fitted edge-to-edge.
(1) As shown in figure 7-13, the bases and tops of palletized unit loads tiered two high are properly supported
by 2-inch boarding. This figure illustrates several fundamental techniques of securing that also apply to structures other
than bulkheads. In general, boarding should be vertically spaced to provide a bearing surface for the top and bottom of
each unit load in the tier. Horizontal center-to-center spacing between uprights, whenever possible, should not exceed
24 inches in tween-deck compartments or 16 inches in the lower holds. Nonheat bulkheads constructed on the stiffener
side of the ship's bulkhead are assembled as shown in figure 7-14. Uprights of 2by 4-inch minimum stock are positioned
on each stiffener. Boarding is vertically spaced in such a manner as to maintain two point contact with each unit load.