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SPRI Announces Plans to Update NT-1 and RP-4 Standards

Those wishing to participate in the canvass process may contact SPRI at info@spri.org

SPRI, the association representing sheet membrane and component suppliers to the commercial roofing industry, announced that SPRI RP-4 2022 “Wind Design Standard for Ballasted Single-Ply Roofing Systems” is being revised and will be re-canvassed for approval as an American National Standard.

Plans to Revise Wind Design Standard for Ballasted Single-Ply Roofing Systems

This standard provides a method of designing wind uplift resistance of ballasted single-ply roofing systems. It is intended as a design and installation reference for those individuals who design, specify, and install ballasted single-ply roofing systems. It shall be used in conjunction with the installation specifications and requirements of the manufacturer of the specific products used in the ballasted single-ply roofing system.

The RP-4 Standard was first approved as an ANSI standard in 2019. This standard is now undergoing its regular review as required by SPRI’s ANSI procedures.

Plans to Revise Detection and Location of Latent Moisture in Building Roofing Systems by Nuclear Radioisotopic Thermalization

SPRI also announced that SPRI NT-1 “Detection and Location of Latent Moisture in Building Roofing Systems by Nuclear Radioisotopic Thermalization” is being revised and will be re-canvassed for approval as an American National Standard.

This standard provides a minimum set of procedures for conducting surveys of moisture in membrane roofing systems, and for the analysis of the data obtained in such surveys. Included are operating, verification and reporting procedures, as well as operator qualification criteria.

The NT-1 Standard was first approved as an ANSI standard in 2012. This standard is now undergoing its regular review as required by SPRI’s ANSI procedures.

Those wishing to participate in the canvass process may contact SPRI at info@spri.org.