Knocking Drain Pipes
Posted by Aaron Jones on February 13, 2003 at 20:58:04:
Hi, our house is a two story home about three years old. Our problem is in the second floor master bed & bath room. When our master toilet, shower or tub is draining there's a sharp knocking against the sub floor coming from the bed room. The knock is fairly consistent but slow with one coming about every five-ten seconds or so while draining.

We've lived here for over two years with no problems till now. What could this be and could it be serious? I'm left wondering if this is more of problem with the sub-floor rather than an actual plumbing problem.

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