shall be determined by the responsible personnel. Tie-down bolts shall be loosened as necessary where heavy skidding members have been used, in order to prevent warpage of the skidding member from adversely affecting the stored item. der the skids. The stored item shall also be leveled by shimming un- 4-08, The length and width of the base shall exceed overall dimensions of the item of equipment not less than 2-inches on each side of four sides. The outside skids shall be the same length and parallel to each other. 4-09. Wood used in the construction of skids shall conform to group ll, 111 or IV of Specification JAN-P-132, mined from Table 1. Sizes of skids shall be deter- One-piece skids shall be provided whenever possible. When one-piece material is not available, skids may be fabricated by lamination or splicing in the following manner: . 4-10. Lamination shall be accomplished by using flat, full length ma- terial in a vertical plane, properly spiked or bolted together. this purpose 2/4's, 2/6's and 2/8's are recommended. For The breaking or joints shall be well distributed. In using 2-inch material, one extra lamination shall be added to compensate for the inherent weakness caused by the splicing. For example, a 6 x 6 member is made up of four layers of 2/6's with joints no closer than 4 feet apart. 4-11, Splicing (which is defined as joining short pieces to make a long piece) shall be permissible only when the member is built up by the lamination process. 4-12. The ends of all skids shall be beveled. The beveled cut shall be one-half the thickness of the skid, and shall be at a 45 degree angle downward from the end of the skid. 4-13. All equipment having four or more holes in the base shall be bolted to the skids with not less than four bolts. Use of lag screws for this purpose will not be permitted. Standard carriage bolt or step bolt shall be used, and the size of the bolt shall be determined by the diameter of the hole in the base of the machine. Bolts securing equipment to skids shall always pass through the skids. Bolting through floor boards only will not be permitted. used under the head and mt of each bolt. A standard washer shall be 4-14. Where it is considered essential to utilize tiering methods to conserve storage space, care shall be exercised in the selection of items of equipment to be tiered. In general, the following types of equipment shall rest on a solid base and shall not be placed on top of other equipment. a. Equipment having leg-type, end-frame, or muiltiple-column machine bases, b. Equipment weighing in excess of 10,000 pounds. 18-38