I've repaired plenty of pre-existing plumbing, but don't know enough to put all new plumbing in a house, so I hired it out. Some of it it is fine, but I'm unhappy with the rest of it, and since I'm not a plumber, I don't know exactly what may be a code violation.
1) PEX was routed outside the wall and can't be sheetrocked.
2) Plastic tees and elbows were used instead of brass.
3) The best way to run PEX is with the smallest number of failure points possible. It would be great to have home-runs to each fixture, but I knew that wasn't going to be the case here. However, there are some runs of PEX that have 4-6 splices in them that are totally unnecessary.
4) Underneath the house (unconditioned crawl) none of the PEX is insulated, and some of it is lying on the ground.
5) The water supply was brought up through an exterior wall, right up against the exterior of the stud and sheathing. Aren't they supposed to go through the center of the stud and install nailing plates?
I'm not a plumber and don't know codes, which is why I hired this out instead of doing it myself. Are any of these code violations?
EDIT: I should have added that a permit was pulled for this work, and it passed a rough-in inspection.