Frozen PEX pipe burst.

This is the first time I see PEX burst because of frozen pipes. There was a house that lost heat with no one living in it. Toilet tanks were solid ice. There were copper in the mechanical room but PEX in the walls and stubbed out in copper. I thought PEX was pretty good at taking frost and I was hopeful that there might not be any burst pipes in the walls. There were 2 burst copper pipes and a cracked brass ball valve in the mechanical room. The kitchen had copper stubbed up through the floor and down about 10" in the ceiling before converting to PEX. When turning on the water we heard a leak in the ceiling under the kitchen sink and it turns out there were a burst PEX pipe both on the cold and on the hot line in the exact same spot basically. I'm thinking that PEX might be good at dealing with frost when it has enough pipe to expand but on short pieces like this it might not take frost too well. I also thought it was weird how the hot side has burst perpendicular to the pipe and not with the pipe like you normally see.


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