pipe dr
New Member
I am having a problem with water hammer or reverse hammer (i think) in my house. Every time I run my washing machine and the water is filling I get loud banging sounds like copper pipes are expanding and contracting (knocking i have installed water hammer arrestors on the washing machine hot and cold lines this has had no effect what so ever ). Also, every time I flush a toilet in the house I am getting a banging sound when its done filling and the valve shuts at the water heater (in the basement). I have tried everything (I have installed two water hammer arrestors at the highest point above the hot water tank in the basement, this has been no help). . the banging is also when i quickly shut off the kitchen tap I am out of ideas. Do I need an expansion tank somewhere in the line? Do I need more water hammer arrestors installed? any ideas ?