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Roof Wind Designer is intended to provide users with an easy-to-use means for 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 the American Society of Civil Engineers (ASCE) Standard ASCE 7, "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 and NFPA 5000: Building Construction and Safety Code. Roof Wind Designer allows users to choose between ASCE 7's 2005, 2010, and 2016 editions. Roof Wind Designer uses ASCE 7-05's Method 1—Simplified Method, ASCE 7-10's Envelope Procedure, Part 2: Low-rise Buildings (Simplified) of Chapter 30, ASCE 7-16's Envelope Procedure, Part 2: Low-rise Buildings (Simplified) of Chapter 30, and Part 4: Buildings with 60ft < h ≤ 160ft (Simplified). For a more detailed explanation of ASCE 7's three editions, please click here.

Also, Roof Wind Designer determines roof systems' minimum recommended design wind-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," AISI S100, “North American Specification for the Design of Cold-formed Steel Structural Members" and AA ADM1, "Aluminum Design Manual: Part 1-A—Specification for Aluminum Structures, Allowable Stress Design; and Part 1-B—Aluminum Structures, Load and Resistance Factor Design." Using these minimum recommended design wind-resistance loads, users can select appropriate wind resistance classified roof systems.

Edge-metal flashing systems take into consideration a safety factor in reliance of ANSI/SPRI ES-1 "Test Standard for Edge Systems Used with Low Slope Roofing Systems."

Roof Wind Designer has been developed and is maintained by the National Roofing Contractors Association (NRCA), with initial support of the Midwest Roofing Contractors Association (MRCA) and the North/East Roofing Contractors Association (NERCA). The application is currently available at no cost.

Questions regarding Roof Wind Designer can be directed to the Contact Us page.

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