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Re: a couple of questions from the new home inspector
There may be several problems going on at the same time.
There may be a anti-water hammer chamber already installed, and, if the old fashioned type, and if it worked for many years, it may have become waterlogged. Without air in it to compress, it is no longer effective. Those can usually be 'repaired' by simply draining the supply system of water and letting the water drain down out of the anti-water hammer chamber.
There may be loose piping (how many times do we find piping properly secured at the proper maximum spacing intervals?). If this is the case, then tracing down the loose pipe, and the loose section of that pipe, cutting the wall open, securing the pipe, then repairing everything back so it looks nice.
If this problem has always been there, then it may be a combination of no, or insufficient, anti-water hammer chambers and loose piping.
Adding additional anti-water hammer chambers may soften the pressure blows enough to compensate for loose piping, allowing the water hammer to stop.
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