b'QUESTION 2: Are you aware of any standards/details for cuttingconditions outlined in Section A4.5, then sections A4.6 and A4.7, for holes through the webs of cold-formed steel studs? Hole Reinforcing and Hole Patching, must be followed. Within AISI S230-19 sections A4.6 web holes are deemed repairable ANSWER: With respect to a standard for cutting holes in lightweightrather than replaceable if the following conditions are satisfied: a) steel framing studs, there are few resources which can be referenced. the hole is located within the middle 40 per cent of the span, and b) First off, there is a difference between the standard punch-outs foundthe length and depth of the hole is less than 65 per cent of the width in lightweight steel framing. In both the AISI S220 and S240 standards,of the web. Reinforcing is achieved using C-shape sections or steel Section A5.9 outlines the limitations of punch-outs respectively. Punch- plates when the hole size does not exceed the member limitations. outs must not have a width exceeding half of the member width to aThe minimum thickness to be used for the reinforcing shall match the maximum of 64 mm (2-1/2) and must not have a length exceeding 114member being repaired, at a minimum, and must extend a minimum mm (4-1/2) (refer to Figure A4-1, AISI S230-19 Standard for Cold-Formedof 25 mm (1) beyond all sides of the hole. The reinforcing must also Steel Framing-Prescriptive Method for One- and Two-Family Dwellings). be fastened to the member under repair with No. 8 screws spaced at a Holes in the web, however, are outlined in the AISI S220 and S240maximum of 25 mm (1) on center around the hole and with a minimum under section C2.1. This indicates that web holes must be performededge distance of 13 mm (1/2) to the hole.meetinganapproveddesign/standard.Additionally,insectionFor Hole Patching requirements, refer to AISI S230-19 Section C2.2, the cutting of framing members must be completed by sawing,A4.7. Members must be replaced or designed with acceptable cutting or by approved cutting methods to create the web holes. engineering principles if the hole exceeds 70 per cent of the In AISI S230-19 Standard for Cold-Formed Steel Framing-Prescriptiveweb width or if the length of the hole exceeds 254 mm (10) or Method for One- and Two-Family Dwellings section A4.5 Web Holes,the depth of the web.the acceptable web holes are defined as holes in the webs of joistsLastly, the CFSEI Technical Note: Design Methodology for Hole which must not be larger than 38 mm (1-1/2) and be a distance of 254Reinforcement of Cold-Formed Steel Bending Members (Tech Note mm (10) from the bearing edge (See Figure A4-2). If holes exceed theG900-15) outlines how to design/repair unreinforced web holes.ASFIGURE A4-2Web Hole Limitation Adjacent to Bearing (AISI S230-19 StandardFIGURE A4-3Stud Web Hole Patch (AISI S230-19 Standard for Cold-Formed Steel for Cold-Formed Steel Framing-Prescriptive Method for One- and Two-FamilyFraming-Prescriptive Method for One- and Two-Family Dwellings).Dwellings).THE MINIMUM THICKNESS TO BE USED FOR THE REINFORCING SHALLMATCHTHEMEMBERBEINGREPAIRED,ATAMINIMUM, AND MUST EXTEND A MINIMUM OF 25 MM (1) BEYOND ALL SIDES OF THE HOLE. ADVANTAGE STEEL WINTER 2022/23|15'