The plumber completed the rough-in for the new bathroom yesterday. One thing I noticed - he used a chipping hammer to carve a notch out of the foundation so that the lav DWV and supply can be in the wall. At one point, there is maybe 3" of concrete between the smurf tube containing the pex and the outside air. Is this going to be a freezing issue?
Because I am not a plumber, and don't know what I am doing, I probably would have put the DWV in the wall like he did, but ran the supply through the floor.