The Standard for Cold-Formed Steel Framing-Prescriptive Method for One and Two Family Dwellings, AISI S230-07, as well as other industry span and load tables are based on the standard web openings (i.e., punchouts), as defined in the North American Standard for Cold-Formed Steel Framing-Product Data, AISI S201-07.

Presented in this report are the findings from and extensive testing program conducted at McMaster University on full-scare floor joists having larger web openings. Presented is an initial Final Report (86 pages) that was issued by the researcher in March 2007, as well as the results of Additional Testing (7pages) that was received from the researcher in April 2008.

It is anticipated that the results of this study will be incorporated in future standards developed by the ASIS Committee on Framing Standards and design aids developed by the Cold-Formed Steel Engineers Institute.