Roof Wind Designer is intended to provide users with an easy-to-use means for accurately
determining roof systems’ design wind loads for many commonly encountered building types
that are subject to building code compliance.
Design wind loads are derived using Method 1—Simplified Method from the American Society
of Civil Engineers (ASCE) Standard ASCE 7-05, "Minimum Design Loads for Buildings and Other Structures."
This standard is a widely recognized consensus standard and is referenced in and serves as the
technical basis for wind load determination in the International Building Code, 2006 Edition,
and NFPA 5000: Building Construction and Safety Code, 2006 Edition.
Also, Roof Wind Designer determines roof systems’ minimum recommended design resistance loads, which
are derived from the building’s design wind loads, taking into consideration a safety factor in
reliance of ASTM D6630, "Standard Guide for Low Slope Insulated Roof Membrane Assembly Performance."
Using these minimum recommended design wind resistance loads, users can select appropriate wind resistance
classified roof systems.
Roof Wind Designer has been developed and is maintained by the National Roofing Contractors Association
(NRCA), with the support of the Midwest Roofing Contractors Association (MRCA) and the North/East
Roofing Contractors Association (NERCA). Currently, this application is available at no cost to users.
Questions regarding Roof Wind Designer can be directed to the Contact Us page.
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