You mean rigid copper with soldered joints? What happens to them in a fire?He looked at it and said I'd have to do it over again since I couldn't use plastic pipe. When I asked why he said "If you have a fire the pipe could melt" I said if the fire melts the pipe isn't that a good thing, it just may put the fire out. He didn't like my answer, so I replumbed it with copper.
Guys, Keep in mind I am doing mine with just city water pressure connected to a 3/4 pvc pipe. I acualy did the first hole 5 to 7 feet with just the jet nozzle on the water hose but could not keep it going straight so I pulled it out and started over with the PVC pipe moving it over a foot. That being said I have already done 20 feet. It works very well with just the jet nozzle , pvc pipe and city water pressue.