Originally Posted by misterkit
I think hes talking about the one in post#8 labled "Entrance of run in to equipment closet ". Putting a hole towards the bottom of the joist reduces its strength, thus why building inspectors have an issue with it.
There is just no way to say it, but this just isn't good.
From the American Wood Council http://www.awc.org/pdf/WCD1-300.pdf
, page 8:
Notching and Boring of Joists
Notches or holes in joists for plumbing or wiring shall not be cut in the middle one-third of the joist span. Notches in the outer-third sections of the span may be no greater than one-sixth the joist depth. Where notches are made at the joist ends for ledger support, they may be no greater than one-fourth the joist depth. Holes in the joist are limited in diameter to one-third the joist depth and are cut with the edge of the hole no closer than 2 inches to the top or bottom edges, Figure 26.
The floors above will have more deflection as a result of these large holes, and joist failure may occur. If this happens when you own the house, your insurance may refuse to cover repairs if the work was done without a permit. If you sell the house, you may be required to sign a document that all modifications were done with permits. If the new owners experience a problem and you knew there were building code violations, I think you would be spending money on a lawyer.
Unfortunately, just destroying photos, although I am sure was said tongue in cheek, will be insufficient. You will need to provide evidence of passing a building inspection, which would likely be difficult....
Seriously, you should consider how to repair this now. Unfortunately I think the joists run the length of your HT room, so it would be difficult to add something under the weakened joists (would need the run the full length of the joist). The easiest thing might be to add a beam under all the joists at the edge of the equipment closet, and reinforce the weakenened joists too (glue and screw a support to the bottom of the drilled joists). I would recommend getting an engineering firm's appraisal on this.