K
Knobhead
.
If I remember what they said it was you should only drill the web of the I beam and only within the centre third of the width leaving the outer thirds well alone, if you follow this then it will have no detriment to the structural integrity of the beam. if the hole is sizable or strays into the outer third on either side then a structural assessment should be made. The Irony here is wood is 10times weaker than steel and if we were so red-taped with H&S with wood as we are with steel then we would be requiring a structural Engineers evaluation and permision everytime we drill a wooden joist in a typical house.
Why didn’t state that proviso in the first place.
You stated you regularly drilled RSJ’s and no one should worry about it.
Unless there is torsional or transverse stress the centre of the web is reasonably safe.