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I <br /> ' I <br /> I� comply with National Roof Contractor's Association guidelines. <br /> � Prefabricated metal roof curbs shall be manufactured by Custom <br /> Curb, Pate,by the manufacturer of the supported equipment, or <br /> ; � approved equal. <br /> I B. Curbs shall be constructed using minimum 18 gauge.galvanized <br /> � � steel (14 gauge for curbs with any side longer than 4'-0" and for a11 <br /> I curbs supporting HVAC units) with fully mitered and welded <br /> corners, raised 3" integral cant for roof deck insulation, integral <br /> ibase plate, internal reinforcing with 1" x 1" x 1/8" steel angle for <br /> , curbs with any side longer than 3'-0", factory installed 1-1/2" thick, <br /> ' 3-pound density fiberglass insulation and factory installed pressure <br /> treated wood nailer. Minimum height of curb shall be/8"//12"/ <br /> � above finished roof surface. (Consult architectural plans for roof I <br /> � type and thickness). Curbs shall be constructed to match slope of <br /> � <br /> roof and provide a level top surface for mounting of inechanical <br /> � equipment. <br /> I I <br /> ; C. Curb types shall be as follows: <br /> � 1. Fan Curbs with standard curb construction as described <br /> ' above- Custom Curb Model CRC. <br /> • ! <br /> 2. Equipment Support Curbs with minimum 18 gauge <br /> � galvanized steel shell,base plate and counterflashing, wood <br /> , nailer, and internal bulkhead reinforcement- Custom Curb <br /> I Model CES. <br /> � PART 3� -EXECUTION <br /> � <br /> i �.1 CURBS <br /> ; � A. Curbs sha11 be installed in accordance with manufacturer's <br /> ' published installation instructions and as detailed on the drawings <br /> ans as coordinated with roofing installer. Size of curbs and <br /> ! required options shall be coordinated between curb manufacturer, <br /> equipment manufacturer, general contractor, and mechanical <br /> I <br /> contractor and roofing installer prior to fabrication. <br /> j B. Install curb so that installed equipment is level and plumb,parallel <br /> I and perpendicular to other building systems and components in <br /> exposed interior spaces, unless otherwise indicated. <br /> �, <br /> �.2 CUTTING AND PATCHING <br /> � <br /> I <br /> � � <br /> ICT 99184 <br /> � � 15050 - 3 <br /> , , <br /> � I <br />