I-Joist alterations

Observed notching of an I-joist at a recent inspection. PVC piping is 3". I know this is improper, but how can this be repaired? Would you recommend investigation by a licensed g.c. familiar with I-joist aspects or a structural engineer.

Neither, possibly.

Take a look at page 11 of this PDF.


Some holes in the web of I-joist are permitted by the manufactures depending on size and location.

Question regarding the chart on page 11. If the I-Joist is a 11 7/8 TJI 230 then a 4" notch must be 2 feet from the end of the I-joist, is this correct?

Thank you for your response.

That is the way I see it, Sidney.

Marcel :):smiley:

Wow, look at the size of that spider.


Unless I’m reading the chart incorrectly, a four-inch hole can be a minimum of one foot from the end. By the way, it is a hole, not a notch. A “notch” would be a cut from either the top or bottom flange, and that is not favored at all by composite joist manufacturers.

Richard, I believe you have to go to the chart on the right for square holes. The distance increases to 2’.

Marcel :):smiley:


Ah thats nothing cant wait for the summer of black widows and brow recluse

No problem here. Unless you touch the top or bottom chord you can take out way more than this.

That’s just a grandaddy-long-legs.