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seen Jan 13 at 23:13

Jan
13
awarded  Notable Question
Feb
6
awarded  Popular Question
Oct
11
comment How can I tell if stains are caused by a ceiling that is drying out, or if there is still a leak?
I'm going to accept this answer as it's the most informative and I believe more technically correct. Long story short, it turns out there was still a leak (now fixed), but I have to agree with the comments on capillary action - the stain appears to spread as the moisture soaks out from the bulk of dampening material between floors. Like woodchips says, it's difficult to know how long this can go on for and in my particular case it was continuing to spread as the water was not stopped. However, even once we found the leak and fixed it, the stains still continued to spread as the ceiling dried.
Oct
11
awarded  Scholar
Oct
11
accepted How can I tell if stains are caused by a ceiling that is drying out, or if there is still a leak?
Sep
28
comment How can I tell if stains are caused by a ceiling that is drying out, or if there is still a leak?
Nope, there's no pipes behind the wall. It looks like it's a leak from an outflow and that's why we're seeing so little water / marking. It's unfortunate that we've managed to get two leaks at exactly the same time making it very difficult to ascertain if it's residual or otherwise.
Sep
18
awarded  Student
Sep
10
asked How can I tell if stains are caused by a ceiling that is drying out, or if there is still a leak?