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• <br />H. ROOF SUPPORT MATEP.IAL - Minimum Re uirements <br />Conventions or Temporary and Suoplementa <br />Dimension of Posts - The length of post shall be as required, and the <br />iameter must be at least one (1) inch for each fifteen (15) inches <br />in length, but not less than four (4) inches - posts of other sizes. <br />shall have a cross-sectional area equal to that required for round <br />pasts of equivalent length. Smaller posts may be used provided they <br />are set in clusters to provide equivalent support. <br />Type of Post - Round or split of solid straight grain wood with the <br />ends sawed square and free from aefects which would affect their <br />strength. Posts may also be of aluminum or steel of equivalent <br />strength. <br />Ca blocks, size, and sha e - Cap blocks and footers shall have flat <br />sides and be not ess than 2" x 6" x 18" in size. <br />Wedges, size and shape - 1/0" x 3} x 10" minimum. <br />• <br />* Crossbars, t e and size - Crossbars shall be of straight grain solid <br />wood ana they s.hal be not less than six (6) inches by eight (8) <br />inches of varying length, or aluminum or steel of equivalent <br />strength. <br />Planks, size - A minimum of two (2) inch thick by ten (10) inches <br />widewide-o~ing length. <br />Gribbin blocks, size and sha e - Wood cribbing blocks shall have <br />at pars e e sides an a not less than thirty (30) inches in <br />length. Fibrous concrete crib blocks that are USBM approved may also <br />be used. <br />Crossbar Han ers - These items shall be used to prevent a crossbar <br />rrom a ing in the event a leg(s) become dislodged: 5/8" x 6" Ohio <br />Brass roof bolt or equivalent, 1/2 turnbuckle or equivalent, 6" x <br />6" x 1/4" roof bolt plates or equiavalent, 1/4" wire rope or <br />equivalent, and the Rock Clip or equivalent. <br /> <br />* Resin Grouted Roof Bolts <br />Manufacturer: <br />Jenmar, Colo. Fuel & Iron, <br />Union Forge, Saf Loc or equivalent <br />Minimum Length: 48 inches <br />Type Steel: Mild <br />Minimum Yield: 11,000 lbs. <br />Size of finishing bit: 1 1/32 inch <br />Manufactuer's Cesignation: <br />Rock Bolt <br />Ciameter 3/4 inch <br />Type head: Standard <br />Flange: 1/c" inch <br />-1- <br />