There is such a thing as thick-walled copper piping, Type L.

I’ve got thick skin so you can tell me I’m an idiot also haha.

It was in June 2020 in the thick of it and these are the lawyers I used. 

If you still have thick carpet or tiles, the reading won't be accurate no matter who does the reading.

The structurally bad part is that we have small, unnoticeable earthquakes all the time and the basements then didn't have rebar, adequate thickness, or good footers.

Many bathrooms have stall showers tiled 6+ feet high with thick concrete walls and floors covered with tile.

style="-webkit-font-smoothing: antialiased; margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-weight: 400; font-stretch: inherit; font-size: 1rem; line-height: 22px; font-family: "open sans", sans-serif; vertical-align: baseline; position: relative; overflow: hidden; color: rgb(52, 65, 77); letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; height: 1288px;">BRRRR and a TIP OF THE DAY : )RUN YOUR NUMBERS!!!!

Aside from redoing the floor and installing thick rubber noise barrier, which will be very expensive, what do folks recommend on solutions to decrease the impact noise heard on the 1st floor?

There are various thicknesses 8mm 7mm 5mm some with pad, this is for family with kids & dog my typical tenants.

If you decide to drywall, look into buying thin 1/4 inch thick drywall and place it right over the paneling.