I've worked on jobs where the plumbing had already been installed under/in slabs but I've done very little plumbing where slabs are to be poured. I've got a customer telling me to just lay the pipe on the ground. I've always trenched to set the slope of drain pipe and to protect all of the pipe from equipment running over it. What is the RIGHT way to do it? Most of all I don't want to waste time and don't want the customer thinking I'm incompetent or an idiot. Of course, he thought my price was too high and that it would only take a couple of hours to completely plumb this job... yeah, right. This is in a high dollar neighborhood and I do want to pick up more business, especially repair business since it is right up the road from my home and I live far out in the boonies...