Are there heating blankets to keep brick walls from freezing?
Yes. Electric heating blankets are available. They are expensive, however; about ten times the cost of unheated thermal blankets, or just under $4 per square foot. For this reason, they are typically used to heat piles of sand and not for keeping masonry walls from freezing. They are very effective for heating sand. They cost very little to operate, roughly 10 to 20 cents an hour, depending on electrical rates in your area. Even this generally is not an added cost to the mason because the general contractor normally pays for electricity. When the air temperature is 20 F, the temperature beneath the thermal pad is about 80 F. When the air temperature is 0 F, the temperture under the pad is about 60 F.