To avoid punctures, it's best to minimize the locations where tubing passes under partitions that will be mechanically fastened to the slab. If this can't be avoided, mark the locations of buried tubing and make sure to use short fasteners. If the framer is agreeable to fastening the partitions with construction adhesive, a method that works well but that requires a warm, dry slab when the adhesive is applied, the tubing can be run under partitions without restriction. Also, it's best to minimize the locations where tubing crosses under sawn control joints in the slab. This reduces the number of control-joint sleeves as well as the possibility of nicking a tube that might have been improperly lifted under a control joint.
Leaks are repairable with special fittings, but the process is both time-consuming and costly.