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than 15/32" thick. Contact Mule-Hide for maximum membrane sheet widths, <br /> fastener sizes and spacing when using plywood, as requirements will change <br /> with thickness used. Insulation, barrier board or slipsheet may be required under <br /> the membrane. <br /> 3. Structural concrete and pre-cast, pre - stressed concrete (3,000 psi minimum) <br /> shall be cured and dry to industry standards. Surfaces shall be smooth and free <br /> of moisture or frost. All sharp ridges or other projections above the surface shall <br /> be removed before roofing. An insulation, barrier board or slip sheet is required <br /> under the membrane. <br /> 4. Lightweight Insulating Concrete Fill and Metal Formwork (minimum 24 -gauge <br /> metal formwork) — the roof deck shall be cured and dry to the deck <br /> manufacturer's and /or industry standards; and shall be smooth and free of ridges <br /> and depressions. All necessary venting as recommended by the roof deck <br /> manufacturer shall be accomplished. These decks may be acceptable to receive <br /> a Mechanically Attached Mule -Hide PVC Membrane Roofing System after pullout <br /> tests have been completed and appropriate fasteners have been selected. <br /> 5. Wood plank (1" minimum) shall conform to Factory Mutual's requirements for <br /> Class I impregnated decks. An insulation, barrier board or slip sheet is required <br /> under the membrane. <br /> 6. Cementitious Wood Fiber Decks - Certain cementitious wood fiber decks may be <br /> acceptable to receive a Mechanically Attached Mule -Hide PVC Membrane <br /> Roofing System after pullout tests have been completed and appropriate <br /> fasteners have been selected. <br /> 7. Gypsum Deck - shall be cured and dry to manufacturer's and /or industry <br /> standards. The surface of the deck shall be smooth and free from ridges and <br /> depressions. Certain gypsum decks may be acceptable to receive a <br /> Mechanically Attached Mule -Hide PVC Membrane Roofing System after pullout <br /> tests have been completed and appropriate fasteners have been selected. <br /> Insulation, slop sheet or barrier board may be required over rough surfaces or <br /> plank decks. <br /> 8. Oriented Strand Board (OSB) shall be a minimum 7/16" thick. Contact Mule -Hide <br /> for acceptable sheet sizes, fastener types and spacing when using OSB as <br /> requirements will change with thickness used. Minimum thicknesses or usage <br /> restrictions may change depending on local code requirements. Pullout tests <br /> must be performed and submitted to Mule -Hide prior to bidding the project. <br /> Minimum pullout values of 250 lbs are required. An insulation, barrier board or <br /> slip sheet is required under the membrane. Fasteners and sheet sizes shall be <br /> determined by pullout values. <br /> 3.03 Preparation of Existing Substrate <br /> A. General <br /> 1. To prevent delays or interruptions, coordinate work with other trades or suppliers <br /> to ensure that components to be incorporated into the Mechanically Attached <br /> Mule -Hide PVC Membrane Roofing System are available as the work <br /> progresses. Examine substrates to which the roofing materials are to be applied <br /> to ensure that their condition is satisfactory for the Mule -Hide PVC Membrane <br /> Roofing System application. Do not permit voids greater than 1/4" width in the <br /> substrate. Concrete substrates shall be cured and free of laitance and curing <br /> compounds. Substrates for roofing materials shall be dry and free of oil, dirt, <br /> grease, sharp edges and debris. Inspect substrates and correct defects before <br /> application of roofing membrane. <br /> 9 <br />