Tech Note F101-24: Screws for Cold-Formed Steel-To-Wood and Wood-To-Cold-Formed Steel Attachments


This Technical Note Updates and Replaces CFSEI Tech Note F101-12

Summary: Screws are commonly used to fasten Cold-Formed Steel (CFS) framing to wood members or attach wood structural panel decking to CFS joists or rafters. The AISI S100, North American Specification for the Design of Cold-Formed Steel Structural Members, provides design equations for determining the capacity of screw connections in CFS members. For wood members, the National Design Specification for Wood Construction (NDS) offers design equations for determining the capacity of various fastener connections, including nails, wood screws, bolts, etc. The APA – Engineered Wood Association and building codes provide multiple resources for determining the capacity of screw connections when attaching wood sheathing. This Tech Note reviews these resources and discusses the design and detailing of these fastener connections.

Disclaimer: Designs cited herein are not intended to preclude the use of other materials, assemblies, structures or designs when these other designs demonstrate equivalent performance for the intended use. CFSEI documents are not intended to exclude the use and implementation of any other design or construction technique.