January 19, 20233 yr Wondering what the regs say on this, as I can't find information on it, just about joists. Googling gives me American standards saying you can drill up to 40% of a stud's width, even up to 60% if you double them. Other than that, I came across an apparent structural engineer saying up to 50mm in a 40x95mm stud is fine, but nothing clear-cut written in stone.
January 19, 20233 yr There's no hard and fast rule. If it isn't a load bearing wall then it just needs to be enough wood to hold itself up. 50% removal sounds fine for that.
January 20, 20233 yr Is this one hole for a single ~50mm service, or do you need a transit for multiple cables / small bore pipes?
January 20, 20233 yr Author 11 hours ago, Nickfromwales said: Is this one hole for a single ~50mm service, or do you need a transit for multiple cables / small bore pipes? Single 40mm conduit (I could go 32mm but HDMI cables are a PITA), through a couple of studs. It's going into an interior wall in the attic space, so I can't get it in there unless I rip up floorboards and go from underneath. Going through the side would be easier if the holes are able to be bored. Pretty sure it is not a load bearing wall as it's parallel with the joists above it. Edited January 20, 20233 yr by nostos156
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