ANSI/SPRI ES-1, "Wind Design Standard for Edge Systems Used with Low Slope Roofing Systems," is a standard addressing the design wind loads and wind resistances testing of edge metal systems, except gutters, used to secure the perimeters of low-slope membrane roof systems.
The International Building Code (IBC) and NFPA 5000, Building Construction and Safety Code, contain specific provisions requiring specific edge metal flashings to comply with ANSI/SPRI ES-1. For example, in the International Building Code, 2012 Edition, the provision reads as follows:
"1504.5 Edge securement for low-slope roofs. Low-slope built-up, modified bitumen and single-ply roof system metal edge securement, except gutters, shall be designed and installed for wind loads in accordance with Chapter 16 and be tested for resistance in accordance with Test Methods RE-1, RE-2 and RE-3 of ANSI/SPRI ES-1, except Vult wind speed shall be determined from Figure 1609A, 1609B, or 1609C as applicable."
The 2003 Edition of ANSI/SPRI ES-1 is applicable to the International Building Code, 2012 Edition.
ANSI/SPRI ES-1 also is sometimes referenced in project specifications as a specific requirement for edge metal flashings.
ANSI/SPRI ES-1 consists of two primary parts. The first part provides an analytical procedure for estimating the design wind loads that will act on the perimeter edges of low-slope roof systems. The second part provides three test methods—RE-1, RE-2 and RE-3—for evaluating the wind resistances of edge-metal systems design. The fundamental concept of ANSI/SPRI ES-1 is the tested wind resistances of a specific edge metal system need to be greater than the design wind loads for the specific building being evaluated.
Customarily, design wind loads for building designs are determined by the project designer. Design wind loads should be clearly delineated on the project drawings or in the construction documents.
Wind resistance values for specific edge metal flashing profiles typically are provided by the manufacturers of edge metal systems. Project designers should include in their designs specific edge metal systems that have wind resistance values suitable for the specific building design.
NRCA has conducted extensive testing using ANSI/SPRI ES-1 of various edge metal flashing profiles that are usually shop fabricated. The edge metal profiles tested are based upon the construction details contained in The NRCA Roofing Manual. This testing provides roofing professionals who fabricate edge metal flashings in their own sheet metal shops a means of supplying edge metal flashings that comply with ANSI/SPRI ES-1.
NRCA also maintains certification programs with Underwriters Laboratories Inc. (UL) and Intertek Testing Services, N.A., based upon the ANSI/SPRI ES-1 testing we conducted. These certification programs provide third-party verification of compliance with ANSI/SPRI ES-1 by a code-approved testing agency. Although such thirty-party verification is not a specific requirement of IBC and may not be required by project specification requirements, it does provide credible, independent means of showing edge metal flashings fabricated in your sheet metal shop comply with ANSI/SPRI ES-1. Additional information about these certification programs is available by clinking on the links below: