Bathroom sink stayed liquid overnight with just dripping, but the kitchen sink is on an exterior wall and froze solid last night. I got under there with a heat gun and got the water flowing again, fortunately the whole system didn’t freeze so nothing burst. I also installed a heating cable with a thermostat on the pipe, got it wrapped up snug under some foam insulation, hopefully that’ll keep it liquid as long as I keep some water running through it. gonna monitor tonight and see how it goes.
Sorry for no pics, it is very cold and I went as fast as possible.
Frost line.
Water pipes are burried far enough down that the ground around them is always above 0°c/32°f.
Fun fact: large grazing animals lower the frost line in the northern Asian steppes.
Lower as in deeper or lower as in less depth?
Deeper. They help maintain the permafrost and prevent global warming