CallMeVilla

We are piping an outdoor shower. The water supply from the house will be under concrete and the pipes (PEX) themselves will be 12" in the dirt below the concrete.

Where the pipes stub up from underground, we will use pipe wrap.

Can we just run the PEX in the dirt (there are no unions or connections)? Alternatively, do I have to sleeve the PEX in a PVC pipe where it is underground?

There is NO freeze problem here in Southern CA.

Just askin'

TerryDM

As it is here in Iowa, yes, you can bury Pex. We (I work for the local water utility) require it to be the blue PEX because of the it sitting on rolls in the sun for weeks on end and the blue is more sun resistant. If I find red PEX I'm supposed to turn down setting a water meter. Little more info than you wanted, but worth mentioning if you don't know how long what you bought was sitting in the sun and you're burying it.
You should be pretty safe since you won't have fittings, unions, etc. Also, as far as I know in my area, you DON'T need to sleeve it in PVC.

PS. You may consider running a tracer wire with the line in case someday you forget where it's buried and someone needs to locate it.

CallMeVilla

Thanks Terry . . . I always tape on a tracer wires for plastic piping (gas PE) so your suggestion makes a lot of sense. The original cold water copper pipe is in the same trench, so adding the tracer wire is a great call for future plumbing issues.

We have been doing a large remodel and chose to sleeve all wires and pipes that are under concrete as a "best practice." Piping that stubs up and out of the dirt/concrete is pipe wrapped. The PE pipe sweeps are metal at that point, but we wrapped them anyway.

PS All our PEX is new and was stored inside at the supplier. Besides, you would not find red PEX on our jobsite because its long since buried. :0)

kok328

Im thinkin if the original copper pipe will remain in the trench then you shouldn't need a tracer wire.

TerryDM

kok328 - you're right but I think he meant FUTURE plumbing projects.

Glad to help with any suggestions!