A-A-1241
Design. Boxes shall be constructed as shown in figure 1. Additional battens or cleats (see figure 1) of the same width and thickness as the cleats on the ends of the box shall be applied to side, top, and bottom. When the unsupported span exceeds that given in Table IV for the thickness of the parts involved, additional cleats applied to ends shall run across the grain of the end boards and be placed equidistant between the regular cleats. Ends of all cleats shall extend within 1/8 inch of the outside surface of top and bottom. Battens, applied to sides, top, and bottom, shall run across the grain of the part to which they are applied and shall be placed inside the box whenever the nature of the contents will permit. The unsupported span is the distance between battens of cleats, of if no battens are used, the inside length of the box. Additional battens shall not be required when sides, top, and bottoms are each comprised of a single board. When battens are attached to ends, sides, tops, and bottoms using nails, the nails shall be clinched 1/8 of an inch minimum. When battens are placed on outside of top, a minimum of two battens shall be used. Skids required, as shown in figure 1.
Preservation. Boxes or all finished wood parts of boxes shall be preserved by immersion for a minimum of 1 minute in a pentachlorophene preservative solution. The solution shall be minimum 5 percent by weight when tested by either method 5 or 6 of the American Wood-Preservers Association (AWPA) Standard A5.
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