I am laying some pvc and emt pipes down and have some questions about the best way to prep for a concrete pour. I am going to pour a little concrete walkway over one part, and another part goes under the driveway, where i've cut a 9" or so slot through the driveway.
I've got the trenches and pipes about 4-8" (depending on where) below where the bottom of the concrete needs to be (to still have a decent thickness of concrete). I was told to sleeve all of the pipes, then I was told that just putting gravel around them would suffice.
I am in southern california and have zero concern for frost, but earth quakes are a concern.
I was told that I have to protect the pvc in particular from coming into contact with the concrete because it can degrade the pipe.
and I was told that gravel is necessary to help drainage, but a. this is all under concrete, so no water should be getting through anyway, but b. they are pipes and i can't imagine why any water happening to pass by would bother them.