Design and Product Specification
Lightweight Steel Framing Design
Manual - 2nd Edition 2006
This manual (232 pages) was prepared to assist the practicing engineer to
design Lightweight Steel Framing (LSF) systems, and was written with a focus on
the fundamental principles of cold formed steel design as they relate to LSF
construction. It shows how to use the LSF manufacturer's product literature
when executing the design of building systems. By following the examples
provided, the engineer will gain an understanding of the design process for
LSF. This 2nd edition has been updated to meet the requirements of the 2005
National Building Code of Canada and CSA-S136-01 (with 2004 supplement)
Specification for the Design of Cold-Formed Steel Structural Members.
Lightweight Steel Framing
Architectural Design Guide
This publication was written to assist practicing Architects with the
selection, design and detailing of wall and floor systems incorporating
lightweight steel framing (LSF) members for low rise commercial and medium and
high rise residential applications.
Steel Stud Brick Veneer Design Guide
This guide has been prepared to assist practicing structural engineers and
architects to design steel stud brick veneer systems for commercial and high
rise residential buildings. Low-rise residential buildings are excluded because
they generally have less exposure to environmental and structural loads.
Lightweight Steel Framing Wall Stud
and Floor Joist Tables
CSSBI 58-11 provides design criteria, including dimensions, material specification
and load tables for cold formed steel framing components intended for use in
building structures. These tables have been calculated in accordance with the
requirements of the 2010 National Building Code of Canada and CSA-S136-0 (with
supplement 2) Specification for the Design of Cold-Formed Steel Structural
AISI Design Standards
The American Iron and
Steel Institute represents the North American steel
industry and is an ANSI accredited standards writing organization. AISI has two
committees working on developing design documents for the sheet steel industry.
The Committee on Specifications (COS) is responsible for AISI S100 North
American Specification for the Design of Cold-Formed Steel Structural Members.
This same document is published for use in Canada as CSA-S136 by the Canadian Standards Association. The other group is the Committee on Framing Standards (COFS) who
develop design standards that are more for structural systems incorporating
cold-formed steel framing members. Many of the COFS standards have been adopted
for use in Canada by reference in CSA-S136.
Copies of the AISI standards can be
purchased through the Steel Framing Alliance website.
The CSSBI has published the following documents to assist in the specification
process for lightweight steel framing products.
Third-Party Certification Program
CSSBI 61-2018: Manufacturer Certification Requirements for Cold Formed Steel Framing Members
These requirements are part of a third-party Certification Program developed by the Canadian Sheet Steel Building Institute (CSSBI) for non-structural and structural cold formed steel framing members.
Under the CSSBI Certification Program, a participating Manufacturer certifies that the designated structural and non-structural cold formed steel (CFS) framing members it produces meets or exceeds the ASTM International (ASTM), Canadian Standards Association (CSA) and American Iron and Steel Institute (AISI) standard requirements listed in this program.
The Manufacturer’s Product certification is validated by a third-party review of the Manufacturer’s Product and production practices, appropriate testing and inspection and applies to Products manufactured for sale in Canada that fall within the range of standard sizes specified by the CSSBI.
A list of certified members can be found here.
When designing any type of structure, considering safety for the occupants, surrounding structures, the general public and fire services should be the number one priority.
In some provinces in Canada, work has been carried out or is in the process of being implemented to amend the building codes to allow for buildings of greater heights to be constructed from combustible material, such as wood frame construction. From the standpoint of safety, the CSSBI opposes these changes and calls on policy and decision makers to fully consider the ramifications of allowing greater use of combustible construction.
Lightweight Steel Framing - Inherently Non-Combustible
Steel is a non-combustible material and will not add fuel to a building fire. As such, Lightweight Steel Framing is permitted in a greater number of occupancies with less floor area restrictions and sprinkler system requirements compared to combustible construction according to the National Building Code of Canada. Some insurance underwriters may recognize the benefit of non-combustibility in reduced premiums. Many floor and wall assemblies made from Lightweight Steel Framing have been tested and several additional designs have achieved significant fire ratings.
Fire Performance and Acoustic Ratings
The design of
buildings often requires that the assemblies have minimum fire endurance or
sound attenuation properties. The Canadian Steel Construction Council and the
Steel Framing Alliance have published a compilation document on fire and
acoustic ratings titled Guide to Fire & Acoustic Data for Steel Floor and Wall Assemblies.
The Canadian Steel
Construction Council has also developed the following Fire Protection Bulletins
pertaining to cold-formed steel.
There are also two
ULC listings for fire resistance ratings of generic LSF floor assemblies:
- LSF non-combustible floor
- LSF combustible floor
In addition to
ULC, there are a large number of UL listings for cold-formed steel assemblies.
UL has recently ruled that applications of UL listings in Canada can be applied
with a Load Restricted Factor of one (i.e. no load reduction). This means that
the whole range of UL listings can be more readily used in Canada. For more
information, go to www.ul.com and search for BXUV7.GuideInfo in their online