WATER HAMMER

[paulevergreen]

Hello,
I'm a G.C. looking for someone to help me figure out bathroom remodel water hammer issue. I completed 2nd story master bathroom remodel project in Northern California in an older home built around the turn of the century. We converted a giant master bathroom into a normal size master bathroom and guest bathroom. The house is plumbed using 3/4 and 1/2 inch copper pipe. I'm 99% confident that the pipes have been adequately strapped. The main source of the hammer occurs near the toilet in the master. Here are the things I've done to address the issue:

1. Water pressure was at 85 psi so I installed a 3/4 inch Watts PRV valve at the water main.
2. I installed a thermal expansion tank on the hot water heater.
3. I installed hot and cold water hammer arrestor in the attick.
4. I installed a 3/4" x 24" air chamber in a crawl space.
5. I re-seated the shower valves.

Because of existing hardwood floors I did have to run some of the pipe from the floor up the walls, over and down into the shower. If anyone has any ideas on what else I can try I would be very grateful.

paul

 

[Reach4]

The main source of the hammer occurs near the toilet in the master.

This is a single bang that occurs when the fill valve on the toilet shuts off, or is it something else?