I have 2 parts of my floor (on in the kitchen and one the bathroom) that have rotted through. I know what happened in the kitchen there was a leak that went unnoticed. However it wasn't until last night when I sat down on the toilet and it went forward and the pipe came yanking out of the wall that I realized I had any problem there. Luckily by the time my fiancee realized I was screamng about something real (such as water going everywhere) I had already grabbed the cut off key and was handing it to him. Now to my question, is there any way to figure out what happened in the bathroom and how do I go about fixing this at minimal cost. My fiancee is a construction worker and swears that it has to be done by a professional but I've seen on other sites where it gives directions for doing it yourself. Any Advice!