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Wind girder/ <br />handrail combo <br />Air circulation <br />vents. <br />Foundation <br />Pontoon hatch <br />Pontoons <br />AEcess hatch -The desi ocks down the covers, so that they <br />seal the pontoon compartments to maintain the buoyancy of <br />the floating roof even if the roof becomes partially subm e <br />/R Two passes on all <br />weld seams <br />Steel bottom plates <br />1/4" minimum <br />Leak detection grooves <br />