Observed the phenomenon after new HE washing machine was installed in 2018. Had no instances of jack hammering at the main water shutoff valve with previous washing machine.
-House built in 1988
-all polybutylene piping was replaced in the mid-90s with 1/2" copper
-water shut off (in the house) is a CPVC ball valve (replaced in 2008; original valve was a gate valve)
-replaced water heater in 2019 and no thermal expansion tank was installed
-Sioux Chief water...
Resonance (jack hammering) at main shutoff when toilet tank starts filling
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