I have a new manufactured home in the greater Seattle area. Our frost line is at 12” and the home sits on concrete runners.
My contractor ran a common trench for our utilities, power and cable and water.
We are supposed to back fill the house a bit but I’m not sure how much, but I’m trying to find the right way to bring plumbing in.
One plumber said they would just put insulated pex on and pass it straight in above the runners. Another said he would put a valve box in and a main shut off first.
Neither addressed frost concerns. I asked online and everyone said the line should come up through the concrete not above it.
What’s the best way to solve this properly?