ANSI SPRI ED-1:2019 pdf free download – Design Standard for Edge Systems Used with Low Slope Roofing Systems
1.1 Scope
This Standard provides the basic requirements for wind load design for roof edge securement of roof edge systems, including gutters and nailers. It also provides information on material thicknesses that lead to satisfactory fatness, accommodating thermal movement, how to minimize corrosion, methods for testing roof edge systems, and other factors affecting roof edge performance. This Standard is intended for use by those that design, specify, and manufacturer roofng materials and roof edge systems used in the roofng industry. The membrane manufacturer shall be consulted for specifc recommendations for making the roof watertight at the edge. This Standard applies to low slope membrane roof systems, with low slope defned here as roofs having a slope ≤ 9.5 degrees (2:1 2). The design and installation information found in this document addresses copings, horizontal roof edges, and gutters as well as the following factors which shall be considered in designing a roof edge
Ballast: an anchoring material, such as aggregate or precast concrete pavers, which employs its mass and the force of gravity to hold (or assist in holding) single-ply roof membranes in place. Cleat: a continuous metal strip, or angled piece, used to secure metal components. Clip: a non-continuous metal component or angle piece used to secure two or more metal components together. Cold rolled: the process of forming steel, aluminum, and copper into sheets, panels, or shapes on a series of rollers at room temperature. Coping: the covering piece on top of a parapet wall exposed to the weather, usually made of metal, and sloped to carry off water. Copper: a natural weathering metal used in metal roofng or fashings. Deck: the uppermost structural component of the building immediately below the roof system. The deck must be capable of safely supporting the weight of the roof system, and the loads required by the governing building codes. Design load: the total load on a structural system for the most severe combination of loads and forces which it is designed to sustain. Design pressure: the design load on a structure due to pressure, either negative or positive, caused by wind. Drip: the lower most portion of a metal fashing or other overhanging component, which projects away from the building with the intention preventing capillary action and controlling the direction of dripping water to help protect underlying building components. Fascia: the vertical or steeply sloped roof or trim located at the perimeter of a building. Typically, it is a border for the low-slope roof system. Fastener: any of a wide variety of mechanical securement devices and assemblies, including nails, screws, cleats, clips and bolts, which may be used to secure various edge components.
Galvanic series: a list of metals and alloys arranged according to their relative electrolytic potentials in a given environment. Galvanize: to coat steel or iron with zinc. Gravel stop: a fanged device, frequently metallic, designed to prevent loose aggregate from washing off the roof and to provide a continuous fnish edge for the roofng membrane. Gutter: a generally U-shaped channel for collecting water runoff from the roof and leading it to an outlet. Gutter Bracket: a device that supports a gutter from underneath. Gutter Strap: a device that helps support a gutter from the top. Gutter System: a system consisting of gutter, gutter straps, gutter brackets, joints, fasteners, and roof fange. Low-slope roof: a category of roofs that generally include weatherproof membrane types of roof systems installed on slopes at or less than 2:1 2 (9.5 degrees). Membrane: a fexible or semi-fexible roof covering or waterproofng whose primary function is to exclude water.