SPRI, Waltham, Mass., the organization representing sheet membrane and component suppliers to the commercial roofing industry, announced that it has issued an updated version of its wind design standard. In accordance with guidelines set by the American National Standards Institute, SPRI successfully re-canvassed its revised wind design standard, entitled ANSI/SPRI RP-4, 2002, “Wind Design Standard for Ballasted Single-Ply Roofing Systems.”
This updated ANSI/SPRI RP-4 standard incorporates minor adjustments to its wind tables based on revised data from the American Society of Civil Engineers 7-98 guidelines, according to SPRI Technical Director Dave Roodvoets. The ANSI/SPRI RP-4 standard was developed to give building code organizations a way to inspect and approve ballasted flexible-membrane roof systems. It was first issued, in a slightly different format, in 1985. Subsequently, ANSI/SPRI RP-4 was incorporated in the BOCA (Building Officials and Code Administrators International Inc.) and SBCCI
(Southern Building Code Congress International Inc.) codes and now is included in the International Code Council’s (ICC) building code. RP-4 is also referenced by the National Fire Protection Association (NFPA) in its building code.