waltermelon wrote:
I have never found any water stains or leaks, and I do have siding,
so
it is very likely that the pipes pass near metal. What do you do
about
this? This is harmless?

I think my house was built around 1970.
I've lived in it about 10 years.
No problems yet.
If you're sure it's not leaking, I wouldn't worry.