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Ceilings CAD Drawings Free Architectural CAD drawings and blocks for download in dwg or pdf formats for use with AutoCAD and other 2D and 3D design software By downloading and using any ARCAT CAD drawing content you agree to the following license agreementFlat ceilings constructed of gypsum board that are screwattached to suspension members that support a ceiling on one level extending from wall to wall, are generally exempt from acoustical seismic construction requirements such as perimeter end wall clearance, perimeter hanger wires, horizontal restraint and vertical splay bracing09 54 00 Specialty Ceilings Suspended Drywall Ceiling Installation Suspended gypsum board ceiling detail dwg