SPRI Announces Updated ANSI/SPRI RP-4, ‘Wind Design Standard for Ballasted Single-Ply Roofing Systems’

SPRI, the association representing sheet membrane and component suppliers to the commercial roofing industry, announced that ANSI/SPRI RP-4 “Wind Design Standard for Ballasted Single-Ply Roofing Systems” has been revised and reapproved as an American National Standard.

This standard was developed as a reference for the design, specification and installation of ballasted single-ply roofing systems. Effective with the 2021 edition of the International Building Code it will be the sole reference for the design of ballasted single ply roof systems. Before 2019, the standard was last revised and reaffirmed in 2013.

The standard was revised to comply with the current American Society of Civil Engineers (ASCE) document, ASCE 7-16 “Minimum Design Loads for Buildings and Other Structures.” The standard includes information on performance of pavers when exposed to wind loads; guidance on the impact of the air space under the paver when using paver/pedestal systems; and, guidance on design of ballasted systems for buildings over 150 feet in height.

The new standard is available for download free of charge at https://www.spri.org

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