Sheet Metal & Air Conditioning Contractors’ National Association

Papers and Guidelines


These papers are copyrighted by SMACNA. SMACNA grants single user permission to download and use. Any further use in part or in whole requires permission.


  • Rooftop Ductwork – Round or Rectangular?
    When the Air Handling Unit (AHU) will be placed on a rooftop, the designer must consider the ductwork that must route across the roof as well as the duct supports. The duct designer should make a careful check of the structure’s capacity to carry loads such as the weight of the duct including stiffeners, insulation and lagging, and those loads attributed to the action of wind, the accumulation of snow and ice, and maintenance loads.
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  • SMACNA HVAC COVID-19 Guidance
    This technical resources bulletin includes SMACNA’s recommended Guidelines to open existing buildings with more specific emphasis on the building’s HVAC System.
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  • Hanger Straps Embedded in Concrete Test Results
    The SMACNA Testing and Research Institute (STRI) completed load tests on three different combinations of strap embedded in concrete.
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  • Soldering Copper Flat Lock Roof Seams
    The International Training Institute (ITI) commissioned Simpson Gumpertz & Heger Inc. (SGH) to evaluate 1/2 inch wide flat lock seam soldered joints. The study investigated the in-service cyclical thermal loads that flat seams typically experience, and to test varying levels of dressing extent, joint gaps, voids in solder, edge seam solder geometry, and solder extent, to help analyze the minimum requirements for meeting the intended service life of 75 years without failure in a 1/2 inch wide flat lock seam.
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  • Residential Sheet Metal Guidelines
    The first edition of SMACNA’s Residential Sheet Metal Guidelines offers contractors, designers, builders and homeowners a source of expert information on the proper fabrication and installation of exterior sheet metal in residential buildings.
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  • 2017 Update for Architectural Fascia and Coping Wind Tests Report
    SMACNA’s Technical Resources Committee completed wind uplift testing on custom-fabricated fascia and coping architectural elements constructed in accordance with the SMACNA Architectural Sheet Metal Manual.
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  • Architectural Sheet Metal Inspection Guide
    An invaluable inspection resource for owners of standing seam, batten seam, or Bermuda-type roofs. Presents practical troubleshooting and corrective tips for typical problems of roof panels, gutters, downspouts, fascia, copings, flashing, ridges and hips, valleys, expansion joints, penetrations, fasteners and soldering.
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  • Architectural Sheet Metal Manual
    This completely revised publication contains the most comprehensive set of recommended practices available for proper design and installation of custom-fabricated architectural sheet metal including roof drainage system design for scuppers, gutters and downspouts.
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  • Effects of Imposing a Universal Requirement on All Components of Ductwork
    This technical paper reviews the HVAC Duct Construction Standards, 2nd edition, 1995, specifications and requirements for zinc coating on galvanized steel ducts. Paragraph and page references from the HVAC-DCS manual are provided along with the text.
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  • Custom Fabricated Sheet Metal Test Report
    Achieving uniqueness in building construction should start at the top. When choosing a roofing style, many architects choose custom fabricated metal roofs. SMACNA's Custom Fabricated Sheet Metal Roof Test Report describes the performance of the double lock standing seam and batten seam metal roof conforming to the SMACNA Architectural Sheet Metal Manual.
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