Hi guys, I have a condo that is built on a slab and am currently installing the plumbing to a new tub. There is no access to my p trap once a tub is in place due to the house being on a slab. Below the slab is about 13 feet of open space, so the p-trap will just be exposed to the air that is enclosed under my home. This air is not temperature controlled and is basically the temperature it is outside except that it is surrounded by cement walls. I am worried about the water freezing in the p trap during the cold winter months (temperatures can reach 0 degrees F here in the midwest at times), or the frigid temperatures cracking my pvc cement bonds. I don't know if this is possible, but I was concerned about it.
My questions are: Will the water freeze in my schedule 40 pvc p trap if the tub is not used more than once a month, even though my heat is on inside the condo? Do I need to put pipe insulation around the p trap or is this unnecessary? Do I need to actually go down there and insulate the cement walls to keep the temperature warmer in there? Or do I need to buy some heating device, like heat tape?
Thanks, just trying to figure out how my plumbing will be okay if there is no insulation down there since it can be so cold. I appreciate the help