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<br /> <br />An Educational Bulletin for Metal Roofing professionals <br /> <br />BeloW are some excerpts from the building code, and how they apply to <br />designing and specifying standing seam metal roOfing. <br /> <br />Building Codes and Metal Roofing <br /> <br />. IBC 2000 1504.3 Wind Resistance of Non- <br />ballasted Roofs: Roof coveringS ... shall be <br />designed to resist the design wind load pressures <br />for cladding in Chapter 16. <br /> <br />. IBC 2000 1507.4.3 Material Standards: Metal <br />sheet roof covering systems ..' shall be designed <br />in accordance with Chapter 22. <br /> <br />Whether the roofing material is an architectural <br />cladding or structural roofing system, ALL roof <br />coverings (with the only exception of composition <br />shingles) must be designed for wind loading. <br /> <br />. IBC 2000 2205.1 General: The design of cold- <br />formed carbon and Jow alloy steel structural <br />members shall be in accordance with the AISI <br />Specification for the Design of Cold-Formed Steel <br />Structural Members. <br /> <br />. IBC 2000 1609.1.1 Determination of Wind <br />LoadS: Wind loads on every building or structure <br />shall be determined in accordance with Section 6 <br />of ASCE 7. <br /> <br />The code requires metal roofing design to comply <br />with Chapter 22 on Steel Materials, which refers <br />to the design of coid formed sheet metal <br />components in the Amer\can Iron and Steel <br />Institute (AISI) design standard as the authority <br />on light gauge steel design. <br /> <br />lhe wind pressures referred to in Chapter 15 <br />should be calculated in accordance with ASCI: 7, <br />Minimum Loads for Buildings and Other <br />Structures. For simple structures, sometimes and <br />alternate method is provided within the text of the <br />building code. <br /> <br />. CF2000-1 A GuIde for Standlnll Seam Roof <br />panels: <br /> <br />ThiS requires testing in accordance with UL 580 or <br />ASTM 1:1592. <br /> <br />o 4.2: {UL 580] "doesn't give realist;c values for <br />comparing to design wind pressures that a roof <br />may experience on a particular building .., The <br />panelS behave fike a pre~tensioned membrane <br />that results in un_conservative results. <br />However, the test method {UL 580] does <br />proyide a measure of quality assurance of the <br />assembly."... "{ASTM] E1592 is the best <br />method available for evaluation of roof <br />assemblies... ", and <br /> <br />. 1BC 2000 1504.3.2 Metal panel Roof Systems: <br />Meta; panel roof systems through fastened or <br />standing seam shall be tested in accordance with <br />UL 580 or ASTM E1592. <br /> <br />IMPORTANT: This prescriptive requirement does <br />not give a UL 580 Class 90 rating a "free pass" on <br />meeting the ioading requirements from ASCI: 7. In <br />fact. the code will later demonstrate that UL 580 <br />is not even an acceptable test method for design <br />purposes. <br /> <br />o 8.0: .....The nominal strength of standing seam <br />roof panels under negatiye pressure shall be <br />established bY test in accordance with ASTM <br />E1592-95. n <br /> <br />The AISI produced and adopted this document <br />into the 1999 AISI design standard. Among <br />other important design guidelines, the AISI <br />firmly designates ASTM E1592 a5 the only <br />adequate test method to determine the strength <br />of standing seam metal roofing systems. <br /> <br />@ 2006 IMETCD (Innovative Metals Compony, Inc.) . 2070 Steel Orive. Tucker. GA 30084 . www.imetco.com <br />