Precast concrete wall panels bear on eighteen-inch square grout pads spaced at a maximum of six feet on center and on each side of any panel opening. Concrete grout below the panel is vibrated to obtain continuous bearing prior to erecting the roof structure. High-density plastic shims are provided on the grout pads as required prior to releasing the crane support. Grout pads extend a minimum of three inches from each face of the panel and are widened as required where panel thickness exceeds twelve inches. A single grout pad centered on a panel joint is not allowed, and if the pier width is less than three feet, the grout pad is centered at the edge of the opening.
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