![]() Sheet copper for roofing systems is typically produced to meet requirements in ASTM B370: Standard Specification for Copper Sheet and Strip for Building Construction. ![]() ![]() 1.4 Industry-Specific Standards, Codes Requirements, and Compliance The trade association for copper roofing products is Copper Development Association, Inc. 1.3.1 Current Manufacturers 1.3.2 Industry Trade Associations Such products are also often locally produced by skilled sheet metal roofing contractors. Metallic coated copper – a product coated at the factory with tin or tin/zinc alloy metal.Ĭopper roofing panels, flashing, gutters and wall cladding are produced by a large number of brand name manufacturers.Factory, pre-patinated copper – a product with chemically induced weathering.Sheet copper is generally installed with a bare, mill-finish surface and allowed to weather naturally. Other solid substrate materials may be suitable, but industry standard recommendations or specific roof panel manufacturer installation specifications should be considered to ensure adequate fastener pull-out strength and compliance with uplift requirements. The most common substrate for copper is wood, usually 3/4-in. For further information, refer to the manufacturer instructions and the authority having jurisdiction. In some cases, copper roofs may have been installed before building codes were in place, or may be subject to variances for historical buildings. General slope guidelines are listed in the “Copper in Architecture – Design Handbook,” Table 8.1A, Table 8.1B, and Table 8.1C. Minimum slope is determined by climate, roofing system, roof geometry and other factors. 1.2.1 Roof Pitch LimitationsĪ minimum slope to shed water is required for copper roofs. The design methods for copper roofing systems are listed in “Copper in Architecture – Design Handbook,” Roofing Systems. Custom (a combination of above methods).Īlthough through-fastened (such as corrugated) copper roofing systems are a possibility, they are rare and typically avoided because the metal is penetrated in the process, causing a potential leak point that will only grow when the roof material is subject to thermal stress.Flat seam (unsoldered/high slope and soldered/low slope).These include, in general order of commonality: There are many proven design methods for copper roofing systems. Proper installation techniques are required, and following the design manuals previously mentioned should provide a long-lasting roof system. Stray acids or fluxes should also be neutralized, and exposure should be limited. Care should be taken to prevent oils, handprints, dirt and debris from contaminating the surface. While the material is being stored and prepared for installation, it must be protected from moisture and should not be left unprotected at any stage of preassembly. Desiccants inside the package are often used when the products are to be stored for longer periods of time. Packaging should not trap moisture or allow moisture to penetrate the coil or sheet. We encourage professionals designing, installing or inspecting copper systems to refer to industry standard guides such as Copper in Architecture – Design Handbook for more thorough information.ġ.4 Industry-Specific Standards, Codes Requirements, and Compliance 1.1 Packaging and Storage The following sections provide generalized guidance. Due to the potential for long service life, copper is often selected by building owners and architects who value life cycle financial benefits over low, initial material cost. ![]() It combines adequate strength with superior malleability and resistance to atmospheric corrosion with a desirable self-generating patina finish. Copper is a roofing, flashing, gutter and wall cladding material with an extremely long history of proven performance.
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