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fasteners in the seams in the field sheets. Spacing of the rows of fasteners in the <br /> corners shall be reduced to 40% of the spacing of the rows of fasteners in the <br /> field sheets. Spacing of the fasteners in the seams shall remain the same <br /> distance apart as the spacing of the fasteners in the seams in the field sheets. <br /> Fastener shall be supplied by Mule -Hide and shall be installed according to <br /> fastener manufacturer's instructions and using the fastener manufacturers <br /> recommended fastening tools. <br /> When installing Mule -Hide PVC Membranes using either Mule- Hide's PVC <br /> Coated Metal Flashing or PVC Membrane Flashing, the first perimeter sheet <br /> shall be a half width sheet. Subsequent sheets may be either Perimeter sheets <br /> (half width sheets) or full width sheets as required. tf the project requires FM <br /> compliance, contact Mule -Hide (prior to bidding the project) to review sheet <br /> layouts, sizes and enhancements to address the perimeter and comer areas. <br /> Note: For FM 1 -90 or greater compliance, where the perimeter sheets are wider <br /> than 3', Perimeter sheets cannot run parallel with the direction of the flutes on <br /> steel decks. Full width field sheets are run perpendicular to the edge of the roof <br /> (or base of parapet wall) and additional row of fasteners installed running parallel <br /> and centered between the field seams. <br /> 2. Field Areas <br /> a. Membrane should run perpendicular to the direction of steel deck flutes <br /> and orientation of wood decks. <br /> b. All membrane overlaps shall be installed to facilitate the flow of water. <br /> c. All membrane sheets are to be overlapped a minimum of 5" to provide <br /> space for fastener and disc placement and for a continuous 1 -1/2" wide <br /> weld. <br /> C. The roofing contractor shall check all welded seams for continuity and integrity using a <br /> rounded screwdriver or other suitable blunt object. The contractor should perform <br /> several sample test seams each day. Prior to welding field seams, the contractor shall, <br /> using scrap material, run at least two test seams, each a minimum of 2' long. Each test <br /> seam shall be used to determine adequate seam strength and to ensure the equipment <br /> has warmed up and is operating properly. This should be done each time the equipment <br /> is turned on after a cool down period. <br /> 3.08 Welding of Lap Areas <br /> A. General <br /> 1. Roofing membrane field seams are to be hot air welded. <br /> 2. NI surfaces - to bed man be dean and dry: <br /> B. Hot -Air Welding <br /> 1. Machines for hot air welding are available from several different sources. Each <br /> manufacturer's instructions for use shall be followed, as well as all local codes <br /> regarding electric grounding, supply and other related functions. Since most <br /> automatic welding machines require 218 to 230 volts, the use of a portable <br /> generator on the roof is recommended for greater flexibility. Mule -Hide requires <br /> the use of automatic welding machines for all field sheet seaming. Only <br /> those areas that cannot be completed with an automatic welder may be <br /> 12 <br />