Hello I need to run my pipes under my floor boards the only snag is that the central joist is concrete I could pass the pipe under that but all literacy says put pipes above joists. What can I do?

You usually put them through joists, at least wooden ones. I'd put them under as long as space allows and put pipe insulation on them to reduce chafing.

You could always get a concrete drill and drill a chase but if it were me I'd go along with Brian. Good luck, Tom