Sometimes finding the source of a leak is a lot like being a detective — you have to find where it all started by looking at the evidence. Where’s the water coming from? Is it a roof problem or a plumbing problem? Who do you call to make it right?
http://news.nationalpost.com/homes/mike-holmes-know-how-to-play-detective-to-find-and-slow-a-water-leak-anywhere-in-your-home