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`yl MATERIALS USED IN CONJUNCTION WITH ROOF BOLTS <br />• Wood Cao Pieces; Wooden, Steel or Aluminum Cross Bars; Woooer~ <br />Planks, Steel (Wire or Flatl Roof Mats; Wire Ropes; Steel Bands <br />OF SUPPORT MATERIALS - CONVENTIONAL OR TEMPORARY AND SUPPLEMENTAL <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" min, tip. Split <br />posts shall have z cress-section area equal to <br />that required for rouna post of equal lenntn. <br />TYPE OF POST Round or split of solid straight grain wood with the <br />ends sawea square and free from defects which would <br />affect their strength. <br />CAP BLOCKS, SIZE AtJD SHAPE 4"X 12"k 2" t•'~inimur~ <br />WEDGES, SIZE AND SHAPE 4"k 6"k 1 I/2" h;inimum <br />• CRUSSBARS, TYPE Straight-orain solia wood, steel and aluminum <br />CROSSBARS, SIZE Wood, a minimum Of tnree inches by eight inches of <br />varyino lenoth. Steel or aluminum - a minimum, of <br />four inches. <br />PLANK, SIZE A minimum of one inch oy eight inches of varving <br />length. <br />CRIBBING BLOCKS, SIZE A minimum of 30 inches in length of varying <br />crass sections. <br />• <br />Page Five <br />