Quote:
Originally Posted by Ahuch
Doesn't seem likely... is the pressure in the sink downstairs normal? I wonder if there's a city water main that is leaking from the cold somewhere and the pressure into your house is reduced as a result. I guess the other thing would be if the line that runs upstairs is on an exterior wall and not properly vapor barried/insulated past the tee.
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Well in this weather, any water line running in an exterior wall is at risk of freezing, insulation be damned. Vapor barrier should be a non issue, but yes, insulation and proximity to the warm zone will be a factor.
Totally possible that it froze after the tee on the way to the upstairs. I'd run some hot+cold water slow for a couple hours from the tap that is still working and crack open to do the same on the frozen upstairs. Goal is that:
a) if the line is indeed frozen, the increased pressure from the freeze doesn't blow anything out (by having upstairs cracked)
b) the radiant heat from the working line (by having hot+cold running - we're talking over level faster than a drip) helps thaw out the frozen part and and frozen tap will work itself open if left open a tad.