An aluminum mullion section sits atop a concrete tilt-up wall panel, shimmed as required and sealed with sealant over a backer rod on each side. The concrete panel features a three-quarter-inch chamfer at the sill transition below the glazing. The glazed window unit is installed with glazing sized per elevations and specifications, while the concrete panel behind the glazing is painted flat black. A three-and-a-half-inch dimension indicates the sill shelf width.
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