Oh, yeah, you're screwed then. It's still a lack of insulation/lack of airflow concern of course, but there's no cheap way to fix it.
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HANG ON, lemme take a selfie
You guys pretty much are the only people that see selfies of me. I put one on facebook like, 2 weeks ago, and before that the last photo I put up containing my face was from the world cup. :D You guys are speshul.
I didn't go in the crawl space, my boyfriend did. He didn't take a picture. He is pretty confident that this is the case, because we can't find any other reason. It isn't from either of the bathrooms, we checked, and as far as we can tell none of the pipes have burst, pressure is the same.