Cold Formed Floor Framing Ductwork Openings

The floor joists of cold formed steel cfs structures often require large web openings.

Cold formed floor framing ductwork openings. 69 chapter 4 floor construction woodframe floor systems and concrete slab on grade floors are discussed in this chapter. Although cold formed steel framing for floor systems also is permitted by the irc it is not covered here. This paper is based on an experimental investigation conducted to establish reinforcement schemes for cfs joists with a large web opening located in high. Such as a common floor or ceiling.

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. Standards for cold formed steel framing aisi standard title irc code section standard for cold formed steel framing prescriptive method for one and two family dwellings r 01 1 1 r 01. The answer may surprise you. Reinforcement of such openings may mitigate the detrimental effects arising from such web openings.

Door openings and the framing factor e g 24 inches on center framing versus 19 2 or 16. We use 2 x 4 s we call cross member framing to complete the bottom of the soffit framing. The maximum tolerance shall be 3 4 inch 19 1 mm between the centerline of the horizontal framing. For this reason the 2015 edition of the national building code of canada.

Many builders and architects say that cold formed steel can only be used to frame buildings up to 10 stories but this 40 story project may prove that wrong. How high can you construct a building with cold formed steel framing. Heat is not required to form the shapes hence the name cold formed steel. 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.

4 5 wall design r60 joist design r505 rafter design r804 header design standard for cold formed steel framing header design. 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.