Hi. We are in the process of having a deck built and have to decide on the type of railings to use. I would prefer not to use wood so I found some companies that sell galvanized aluminum rails in specific lengths but they corrode when touching pressure treated wood and have to have a special washer between the aluminum and the wood. We also wanted the ballusters to be horizontal between posts and thought copper pipe might be a good choice. I need help with the pros and cons of using copper. The pipe would be about 7 feet long between posts in 3 rows. Here are my questions:

What happens when copper touches PT wood?

What color does it turn when it has aged nicely?

Any idea on rough price for (roughly!) 250 feet of maybe 5/8" pipe? I live in Atlanta and am sure I can find it locally...

Any other info would be greatly appreciated!! Thanks!!