I have recently purchased a cabin in the woods where temperatures get well below freezing. The cabin sits on a sloping piece of land and is constructed on 4X4's set on concrete blocks. The cabin is 24'X 24' with a covered porch of about 6'x 24'. This leaves a open crawl space under the cabin from about 5'(front)to 2'(back). The pipes for the plumbing run under the cabin and although insulated are exposed to the cold air under the cabin. I have recently put in a well and it and piping are protected from freezing up to the cabin. I have had the system designed to be able to drain while I am not there. What I am asking about is what to do to keep pipes from freezing while I am staying in the cabin. I have been told if I put skirting around the cabin with 1/2" treated plywood and blueboard(?) it will keep the temperature high enough to not freeze while I am using the cabin. Then drain the lines when I leave. Could someone tell me if this is the best way to solve this problem? Thank You,
Randy