Banging Pipes - How to Locate Them - Issue Is Not Water Hammer - Please help!

We just purchased a house in South Florida built in 1987. Whenever you turn on the water (both cold and hot) anywhere in the house (faucets - both kitchen and baths), showers, toilets, washer, ice maker etc. there are pipes banging in the master bedroom/bathroom area. We have copper plumbing - not underground.

We have done the water hammer trick and even had a plumber come out. Plumber and I think there is a loose pipe that needs to be strapped. already went up in the attic, already cut out pieces of drywall and I still can't find where it's coming from. At this point we already need to have a drywall person come out, so I can keep going opening up the drywall, but would rather not hunt and peck. How do I find this noise without opening up our whole bedroom???

Please help!! Any ideas welcome - I am at my wits end.

I am curious as to what "water hammer trick" you are referring to.

You are correct, you could have a loose length of copper causing the noise, however it could also be caused by a washer or toilet valve.