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How cold?

1K views 3 replies 4 participants last post by  Mjtrole 
#1 ·
How cold does it need to get to damage an above ground backflow preventer?
I personally have not seen one freeze enough to break until it gets into the lower 20's but I guess it would depend on how long it stayed below freezing.
Just looking for some thoughts. Thanks.
 
#4 ·
irritation said:
How cold does it need to get to damage an above ground backflow preventer?
I personally have not seen one freeze enough to break until it gets into the lower 20's but I guess it would depend on how long it stayed below freezing.
Just looking for some thoughts. Thanks.
temperature has most to do with it but you have to be aware of the wind which can cause the temperature in that spot to drop even more, funny story....everything up here in michigan froze by the second week of november last year, had one lady that went out of town and forgot to call to winterize, went there to start it up and the water was still on in the basement from last season, Nothing was frozen, no copper splits or poly breaks, unreal for the winter we had.
 
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