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I think I'm going to draw an amateur schematic of my piping. The only constant I can find is that when I shut off the hot water to the shower, the hammer stops. Once I do that, I can flush any toilet and open any valve without the hammer occurring.

I was finally able to get an answer from the city. My water pressure is 61 PSI. The city said they aim to have pressure at 55-65 psi. Is this too high? Also, I'm not sure I can adjust the pressure in my house. I need to inspect the line a little more closely.

It's the Kathunk. I'd describe it as KATHUNK! - buzz - buzz - buzz - buzz. It happens a little when the valve opens, but the bad one is when you shut off the hot water - any hot water: kitchen sink, bathroom sink, shower, etc. It sometimes happens too when shutting off cold water, but not all...

I have had an issue with water pipe hammering for a number of weeks and can't get it to stop. I had my shower replaced about a year ago. Up until a couple weeks ago, there was no issue with hammering. Now, it has gotten really bad. I added pipe insulation all over the place, added and tightened...