What are these copper pipes in my attic?
Probably for heating, don't worry about them unless they have a liquid in them.
the pipes were old radiant heating pipes. and yes they were sometimes installed in attic ceilings.(your ground floor could be concrete making it difficult to install there). after looking at your link , the old pipes are definitely dead as there is a hole in one. just ignore them or rip them out and sell the scrap copper. should be worth a few $ as scrap metal is at all time high.
