You could have leaking toilets or an ice tray refilling in the middle of the night.
Check the toilets for repairs, and see if the icemaker hookup has a water hammer arrestor on it.

: Our pipes are starting to knock in the middle of the night, without water even being run -- my guess it's the cold weather.

: But it sounds like bombs are dropping all over the house...yet when I go down to the basement, it's not really happening on the heater or water heater level -- it's obviously within the walls....so loud it's even waking my toddler.

: Any possible help would be appreciated. I've read that it could be airpockets within the pipes, but why would this happen more at night rather than during the day -- just not being used?

• Re: knocking pipes in the middle of the night kristine 02:43:36 01/14/04(0)