That is odd. And disturbing seeing that I have several thousand of them at the property I work at.

Not sure what to tell you about the walls, when we have flooding issues we just try to get it dried out as well and as quickly as we can. If we tore open walls every time one of our idiot residents overflowed something we'd need a full time guy to handle it.
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Dehumidifier would be very beneficial if you have access to one.
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U could try a couple small (1/4 inch ) holes at some spots right u der the leak, just to see if anything drains out...so u can patch super easy.


If u get anything draining or dripping do a 4 inch and ventilate...

If nothing drips out it will probably dry
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I've had only 1 angle stop ever fail in hundreds...and it was a tiny pin hole from a piece of sand or small rock that ground a pin hole out if the side of the angle stop after 30 years


By fail I mean leak , like you had...I've had a shit load fail as in get plugged or refuse to shut off....
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I've had several supply lines fail though....
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Around here (california) you can get 4 inch fans in any hardware store. Shop vac is over kill , amp wise ...you just need a 4 inch in line fan
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If your relative humidity is fairly low, get as much outside air in as you can.

It has been insanely hot and dry here.

Good luck man. I hate water leaks. I hate plumbing. I hate everything.
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https://www.amazon.com/gp/aw/d/B00F6...kKL&ref=plSrch
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you definitely want to get air into the wall cavity if water got in there. If you don't, you WILL get mold. Really you want to cut off the bottom 2' of the sheetrock to do it right, but at a minimum, put a 2" hole every 6 inches and then put some floor mover fans to blow some air in plus the dehumidifers.
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Wow. I've never seen a failure like that before. The stem looks really brittle. What brand of valve is that?
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I'm not sure of the brand, I'll have to look later. They're only 3 years old....
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Those little egg handled shut offs are shit. By the time you need to use them they either break or leak.
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I'm pondering replacing every one in the house......and maybe going to see the plumber that installed all of them during construction....
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Don't kill him Iowa
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Ironically, the plumber retired early and left the area, but the business is still in place.

I'm not sure that I expect them to do anything about it, but if they want future business they might do something like throw me a bag with a handful of better valves that I can switch out. It's easy to do, just a pain in the ass.

If I had to do what I did yesterday again, I'd be in a bad mood.
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