I have a difficult situation and maybe someone can help. This house (1960)was remodeled 3 years ago. All bathrooms are surrounded by tiles making impossible, unless big damage is done, open the walls for the repairs. This is the situation: when any lavatory HOT side is OPENED it makes a little bang noise, but only when the HOT is opened on any of the 3 lavatories. Now, when we CLOSE the COLD water on any lavatory there is a little stronger bang noise. When the toilets close the fluid master, then there is, on both toilet a stronger bang noise. This starting happened 6 months ago. The water heater has a timer controlled circulating pump. We tried everything possible to stop the banging, including installation of Mini Rester on all cut off valves on toilets, lavatories, clothes washer and at the water heater. I peep through the shower and tub faucets' plates and I don't see any of air chamber or arrestors. If this noise was developed 6 months ago, I assume that the copper pipes was properly attached to frames. Can the problem be the type of shower/tub faucets (American Standard)? Is any way - is there is no air chambers/arrestors to install something without opening the walls? I don't see that replacing the fluid masters will do any good, because there are mini arrestors at the supply valves. Any help? ... and thanks
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