TM 55-607/NAVSEA OP 3221 Rev 2
c. In compartments where hull contour is absent or minimal, extensive preload dunnaging is unnecessary, thereby
requiring only that minor obstructions such as latches, pipes, or conduit be protected. In such cases, spacer material will
be installed prior to stowage, as shown in figure 6-15. The spacers are constructed of uprights of such size necessary to
obtain adequate clearance. Normally, 4 by 4-inch lumber is used for this purpose. Obstructions are boarded over with 2-
inch minimum lumber, as shown in figure 6-16, when required by the size or configuration of the cargo.
Figure 6-15. Installation of spacer material prior to stowage.