I live in a small 10 year old house in Phoenix (1300 sf) and the plumbing was PB (second gen).
Up until this past November I have had NO problems at all with the plumbing, and inspection of it (it is in my attic) reveals it to be in great condition.
However, in early November, after being away for 8 days, I heard this tremendous shuddering noise go through my attic that scared the crap out of me.
Since then I have surmised that my plumbing is making these noises but I can't pin down why. Sometimes they will shudder in the early morning or late night - I thought was because my water heater is on a timer.
But at times I can run hot or cold water, and get the same effect, but with varying levels. Most of the time I can't cause it when I want to. It may happen when I am finishing a shower, it may happen when the toilet tank finshes filling, it may happen when the washing maching is operating, it may happen for now apparent reason at all (then the loudest). I have tried bleeding the lines (ran water out of everything for 20 minutes) and thought it was fixed, by 2 days later it happened again.
I am readying to sell the house (this was planned long ago), but am afraid that this will scare potential buyers away, even though the plumbing visually looks like new.
Help! What is happening and what can I do about it?