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![]() ![]() The minimum slope for lapped, nonsoldered seam metal roof panels with applied lap sealant shall be one-half unit vertical in 12 units horizontal (4-percent slope).The minimum slope for lapped, nonsoldered seam metal roof panels without applied lap sealant shall be three units vertical in 12 units horizontal (25-percent slope).Minimum slopes for metal roof panels shall comply with the following: Metal roof panel roof coverings shall be applied to a solid or closely fitted deck except where the roof covering is specifically designed to be applied to spaced supports. The model building codes have different requirements for different types of metal panel roof systems. Other types are snapped or rolled and locked together, which joins together friction-fit components. Seams may be formed by hand or mechanical seamers, and seams may be single- or double-locked. The seaming process varies depending on the seam profile, but the most common standing seams have a male leg and a female leg. Standing seams can be used as architectural elements to highlight aesthetics, accommodate thermal movement, facilitate panel interlocking and seaming, and add structural characteristics to metal panels. However, strictly speaking, it refers to those metal panels that interlock or are seamed together vertically above the panel’s pan. The term “standing seam” refers to almost any kind of metal roof panel with a raised vertical seam. Flat-seam metal panel roof systems with nonsoldered seams are intended to shed water whereas when the joints are soldered, they become weatherproof. For flat seams, the edges of two adjacent sides of each rectangular sheet are folded over a minimum of ¾ of an inch the edges of the two other adjacent sides are folded under a minimum of ¾ of an inch. Metal panel roof systems can be further categorized into either flat or standing seam. They also can be formed in various shapes and in single or multiple courses. Metal shingles can take the shape of individual or multiple asphalt, tile, slate or wood shingle configurations. ![]() Metal Roof Shingle: An interlocking metal sheet having an installed weather exposure less than 3 square feet (0.279 m 2) per sheet.” The International Building Code,® 2021 Edition provides the following definitions for a metal roof panel and metal roof shingle: “Metal Roof Panel: An interlocking metal sheet having a minimum installed weather exposure of 3 square feet (0.279 m 2) per sheet. Metal roof shingles differ from metal roof panels in that shingles are smaller elements. It’s worth noting metal shingle roof systems are considered water-shedding roof systems, as well. Architectural metal panel roof systems typically are designed to shed water rapidly over the panels’ surface, so the seams are not necessarily watertight. In most configurations, structural metal panel roof systems do not require underlayments.Īrchitectural metal panel roof systems require continuous or closely spaced substrates. They are designed to resist the passage of water at joints, laps and junctures under minimal hydrostatic pressure. ![]() Structural metal panel roof assemblies typically are weatherproof. Metal panels used in structural metal panel roof assemblies have the strength and capability of spanning structural members, such as joists or purlins, without being supported by a continuous or closely spaced roof deck. NRCA distinguishes between two primary categories of metal panel roof systems: structural and architectural. But first, it is important to understand how these systems differ. As metal panel roof systems continue to rise in popularity, you need to be aware of the requirements and recommendations related to their installation. ![]()
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