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That's a great point! The builder kept saying that it's PEX and to not worry about it freezing... but if there were any joins in there (which there shouldn't be), then those could easily crack with freezing. Thanks so much for that. Something like that is easily missed!

Good day! :) They are pex lines. No leaks yet. The walls are 2x6 and the insulation up that wall is spray foam. Unfortunately we haven't opened it up to get a look at it yet. The exterior wall in this case was the choice the builder made (or plumber made) due to the layout (open concept)...

Thanks for the reply! I've been online reading on this for quite some time and it was tough to really find information on this type of a situation. You've explained it very clearly. Thank you so much! This year we had a solid couple of weeks of around -35 to -40, not including wind chill...

Thanks for the reply! Yes, I can't see how the air is going to get up through the wall being that it's all insulated. Thanks again. Much appreciated.

Good day all. I've been to this site a lot and value everyone's replies. I'm hoping someone may have a thought on if this would work or not. We have a 2 story walk-out and this Winter we've had a single water line freeze in a bathroom on the top floor. The water lines to this bathroom go up an...