It costs more to purchase. It costs more to install. Installers have to have a higher level of skill to install it properly. It is less flexible. If the liquid freezes in the pipe, copper will break. It can be damaged by corrosive soils.When you add up all coppers disadvantages, you see why it is the best material for a permanent installation.: I would like to know more information about the disadvantages of using copper pipe. Please send me an e-mail.