I have tapping noise from the heat system in my apt building. I know
what causes it. The pipes are expanding from heat.
For many years I heard a fast series of clicks every 30-60 minutes or
so, but lately, I've been hearing a "slow tapping," which is one CLICK
and then five seconds of silence and then another CLICK. This lasts
Do you know why this "slow tapping" would happen as opposed to the old