
Burst Pipe
Close the main valve the moment a line lets go, because pressure keeps pushing water into framing and insulation until the supply is cut.
When this becomes an emergency
- Water dripping through a first floor ceiling after a night below zero.
- A tap that gave nothing in the morning and then started spraying somewhere unseen.
- Ice forming on the underside of subfloor boards in a crawlspace.
- A steady rushing noise under the floor with the house quiet.
What a pro does
Shutting the water down comes ahead of everything else, and on a lot of Colorado houses that valve sits in an unheated crawlspace or a mechanical room off the garage. The plumber then works out where the split is. Freezing damage rarely announces itself at the break; a pipe swells and cracks while it's frozen solid and only starts moving water once it thaws, which is why so many of these calls come in during the warm afternoon after a cold snap rather than during it. Crawlspaces are where it usually happens. A vented crawlspace under an older mountain or foothills home holds outside air, and a supply line stapled to a joist there has nothing but a few inches of insulation between it and a night at ten below. Garages and additions built over unheated space run a close second. Once the section is exposed, the plumber cuts out the damaged run and rejoins it with fittings matched to the existing pipe, then brings pressure back gradually and watches for the second failure, because a line that froze in one spot usually froze along its whole exposed length.
Frequently asked questions
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