AISI Publishes Design Guide for Cold-Formed Steel Purlin Roof Framing Systems

CFSD - Image - Cover - 2009 Edition of Design Guide for CFS Purlin Roof Framing Systems

WASHINGTON, D.C., April 4, 2009   – The American Iron and Steel Institute (AISI) announced today the publication of the 2009 edition of the Design Guide for Cold-Formed Steel Purlin Roof Framing Systems. The Design Guide is based on AISI S100-07, the 2007 edition of the North American Specification for the Design of Cold-Formed Steel Structural Members. It is available for purchase online at

The guide will benefit designers of single span and continuous multiple span steel purlin-supported roof systems. It provides a comprehensive review of C- or Z-purlin supported cold-formed steel purlin roof framing systems with emphasis on the design of anchorage. It was developed by AISI’s Committee on Specifications for the Design of Cold-Formed Steel Structural Members and the Metal Building Manufacturers Association (MBMA).

  “This Design Guide combines the best current engineering practices and academic thinking as provided by Dr. Thomas Murray, P.E., of Virginia Polytechnic Institute and State University; Dr. Michael Seek, P.E. of Walter Seek Engineering; and Jeff Sears, P.E. of Kirkpatrick Forest Curtis PC,” Jay Larson, P.E., F. ASCE, Managing Director, Construction Technical Program, AISI Steel Market Development Institute, said. “We were pleased to have it co-developed by both AISI and our industry partner MBMA, whose contributions to this project were valuable and greatly appreciated.”

The Design Guide for Cold-Formed Steel Purlin Roof Framing Systems has information on:

  • Design Methods for Purlins - Contains an overview of design methods for cold-formed purlin-supported roof systems.
  • Continuous Purlin Design - Contains discussion on the design of continuous purlin lines, along with ASD and LRFD example calculations.
  • System Anchorage Requirements - Contains information on system anchorage requirements in the Specification and simplified and matrix-based solutions, and provides an extensive set of ASD and LRFD examples.
  • Alternate Analysis Procedures - The methods examined include component stiffness method, frame element stiffness modeling, and finite element modeling for analyzing complex anchorage systems.

AISI’s codes and standards work is conducted under the Construction Market Council of the Steel Market Development Institute (SMDI), a business unit of AISI. The SMDI oversees the industry’s investment in advancing the case for steel in the marketplace as the preferred material of choice. AISI serves as the voice of the North American steel industry in the public policy arena and plays a lead role in the development and application of new steels and steelmaking technology. AISI is comprised of 24 member companies, including integrated and electric furnace steelmakers, and 138 associate and affiliate members who are suppliers to or customers of the steel industry. AISI’s member companies represent over 75 percent of both U.S. and North American steel capacity. For more news about steel and its applications, visit

Debbie Bennett
Manager, Communications
Construction Market
Steel Market Development Institute
Tel: 202.452.7179