I would recommend a licenced mason Please don't have a handyperson do it. It will look terrible and may not withstand an siemic even properly.
i would call some of the licenced home builder in you ... read more
I would do what Paul said but I would take an additonal step of capping the sprinkler heads where they are easy to get to with a half dozen of 1/2" PVC caps. Then you are increasing the pressure ... read more