Cold Formed Floor Framing Ductwork Openings

Although cold formed steel framing for floor systems also is permitted by the irc it is not covered here.

Cold formed floor framing ductwork openings.

Once the ladders are all installed to the bottom of the floor joists you simply connect the bottom of the soffit ladders to either a wall or an opposing soffit ladder to complete the soffit framing. Door openings and the framing factor e g 24 inches on center framing versus 19 2 or 16. Rather the reader is referred to the aisi standard for cold formed steel framing prescriptive method for one and two family dwellings aisi 2001 for guidance. Ii reinforcement schemes for cfs joists having web openings preface 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.

69 chapter 4 floor construction woodframe floor systems and concrete slab on grade floors are discussed in this chapter. The floor joists of cold formed steel cfs structures often require large web openings. 4 5 wall design r60 joist design r505 rafter design r804 header design standard for cold formed steel framing header design. For this reason the 2015 edition of the national building code of canada.

Heat is not required to form the shapes hence the name cold formed steel. How high can you construct a building with cold formed steel framing. The answer may surprise you. The maximum tolerance shall be 3 4 inch 19 1 mm between the centerline of the horizontal framing.

Cold formed steel framing cfs is made from sheet steel that is formed into c sections and other shapes by roll forming the steel through a series of dies at room temperature. Aspects of designing and engineering cold formed steel framing to help you complete your project successfully. Reinforcement of such openings may mitigate the detrimental effects arising from such web openings. Where supported by cold formed steel framed walls in accordance with section r603 cold formed steel floor framing shall be constructed with floor joists located in line with load bearing studs located below the joists in accordance with figure r505 1 2 and the tolerances specified as follows.

We use 2 x 4 s we call cross member framing to complete the bottom of the soffit framing. This paper is based on an experimental investigation conducted to establish reinforcement schemes for cfs joists with a large web opening located in high.