SPRI, the association representing sheet membrane and
component suppliers to the commercial roofing industry, has announced that “The
Wind Design Standard Practice for Roofing Assemblies ANSI/SPRI WD-1” has been
updated and accepted as an American National Standard as of December 2008 after
the removal of permissive language.
SPRI, the association representing sheet membrane and
component suppliers to the commercial roofing industry, has announced that “The
Wind Design Standard Practice for Roofing Assemblies ANSI/SPRI WD-1” has been
updated and accepted as an American National Standard as of December 2008 after
the removal of permissive language.
This Wind Design Standard Practice is the work of several
industry partners and provides a two-part methodology of designing for wind
uplift resistance of non-ballasted built-up roofing, modified bitumen, and
single-ply roofing system assemblies installed over any type of roof deck.
(Refer to the ANSI/SPRI RP-4 Standard for wind design requirements of ballasted
single-ply roofing systems). This standard was originally approved as an ANSI
standard in 2007. The recent changes removed permissive language, which would
prevent the standard from being accepted into building code.
“This wind design standard provides an excellent tool to
assist architects and consultants with the design and installation of roof
systems that are compliant with the wind resistance requirements of the
International Building Code (IBC),” said SPRI Technical Director Mike Ennis.
“This standard contains easy-to-read tables that were developed using the
calculations contained in ASCE-7, as required by the IBC. This standard also
contains prescriptive enhancements that can be used under defined conditions
for the perimeter and corner areas of the roof.”
RP-4 wind standard re-approved
SPRI also announced that “The Wind Design Standard Practice
for Roofing Assemblies ANSI/SPRI RP-4” has been accepted as an American
National Standard as of December 2008.
This standard, which was approved in 1997, revised and
re-approved in 2002, and again in 2008, is intended as a reference for those
individuals who design, specify, and install ballasted single-ply roofing
systems. As required by the American Standards Institute policy, all National
Standards must be re-evaluated every five years.
In other news, SPRI plans to reaffirm ANSI/SPRI RD-1-2003
Performance Standard for Retrofit Drains. This standard, which was approved in
2003, is intended as a reference on retrofit roof drains, which are designed
for installation in existing drain plumbing on existing roofs. Interested
parties may participate in the retrofit drain canvass by contacting SPRI at
781-647-7026, or via email atinfo@spri.
Two SPRI Wind Design Guides Accepted by ANSI