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Originally Posted by kazoo
Up through the 1950's, most plumbers were smart enough to build in water hammer arrestors. On a lateral inside a wall, a tee was installed with the center fitting oriented vertically. A 3 to 4' length was then installed with a cap at the end of it. When filling the system, that vertical leg would trap air and form a water hammer arrestor. As cheap as Bill Levitt was, he did that in the thousands of Levittown, PA homes, and they worked just fine.
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Yes, that will work.
My parent's house built in 1960 had pipe stubs that would do that.
I've never seen a fresh water system with an expansion tank, typically, that's something you see with hydronic heating systems.
If you shut the tap off slowly, you can avoid the banging as well since the problem is caused by the rapid closing of a valve. Toilets seldom produce the dreaded hammer because they close very slowly as the float moves up in the tank.