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MATERIALS USED IN CONJUNCTION WITH ROOF BOLTS <br />k'ood Cap Pieces; Wooden, Steel or Aluminum Cross Bars; Y?ooden Planks, Steel <br />iWire or Flat) Roof Mats; Wire Ropes; Steel Bands <br />ROOF SUPPORT MATERIALS -CONVENTIONAL OR TEMPOP.ARY AND SUPPLEN,ENTAL <br />LENGTH OF POST As required <br />DIAMETER OF POST 1" for each 15" in length up to 9'; post 9'-13', <br />7" min. tip; post 14'-20', 8" m:in. tip. Split <br />posts shall have a cross-section area equal to <br />that required for round post of equal length. <br />TYPE OF POST Round or split of solid straight grain wood with <br />the ends sawed square and free from defects which <br />would affect [heir strength. <br />CAP BLOCKS, SIZE AND SHAPE 4" X 12" X 2" 1"inimun. <br />4!EDGES, 512E AND SHAPE 4" X 6" X 1-1 /2" Minimum <br />CRUSSBARS, TYPE <br />Straight-grain solid wood, steel and aluminum <br />CROSSBARS, SIZE Wood, a minimum of three inches by eight inches of <br />varying length. Steel or aluminum - a minimum of <br />four inches. <br />PLANK, SIZE A minimum of 1" X 8" of varying length. <br />CRIBBING BLOCKS, SIZE A minimum of 30" in length of varying cross <br />sections except for concrete cribs which will <br />have a minimum length of 15". <br /> <br />Page Five <br />Initial 11/01/86 <br />