ticking sound
Posted by Mark on December 23, 2002 at 12:09:53:
I've noticed a ticking sound coming from the wall above my kitchen sink. It's a single story, and there's a vent stack on the roof corresponding to where I hear the noise. I only hear the noise after running some water. I've especially noticed it when the dishwasher drains. The drain and vent pipes are plastic. I've heard that this noise could be caused by the pipe expanding and contracting, rubbing against something. Is this possible? Could the vent pipe expand and contract, even though there is not technically water running through it? If this is the case, what can I do?

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