A cold January night rarely looks like a plumbing problem. The heat runs, and everyone goes to bed as usual. The next afternoon, the temperature climbs above freezing, and water starts running down the inside of a garage wall. Nobody touched a thing. So what changed?
That delay confuses many homeowners. The pipe froze overnight, but the leak showed up only after the ice melted and water could move again. Plenty of emergency water damage restoration calls come in during the thaw for this exact reason, often hours after the coldest point of the night has passed. A faucet with no flow on a cold morning is often the first sign that a line has frozen.
The spot where the water appears can be puzzling too. A technician from Restoration Logistics in Boulder may trace a ceiling stain in a finished basement back to a split pipe several feet away, and that split may sit nowhere near the section that froze first.
How Ice Blockage Pressure Splits a Water Pipe
Pressure causes it, and it builds up in an odd place. Once ice forms a complete ice blockage inside a pipe, the water trapped between that plug and a closed faucet has nowhere to go. Continued freezing pushes the pressure in that short section higher and higher. According to the Insurance Institute for Business and Home Safety, the pipe usually bursts where little or no ice has formed. The frozen part itself often stays intact.
How cold does it need to get? Research from the Building Research Council at the University of Illinois set a temperature alert threshold of 20 degrees F for homes in mild climates, based on tests of uninsulated pipes in unheated attics. Homes in colder climates, Colorado included, usually keep water lines inside the insulation, which helps. Still, the same guidance notes that pipes exposed to moving cold air through a crack or gap can freeze at warmer temperatures.
Here is where that tends to happen.
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Pipes Most Likely to Freeze in Colorado Homes
Most frozen pipe problems start in a few familiar places. Some of them are easy to overlook until the first hard freeze of the year:
- Supply lines on exterior walls, especially under kitchen sinks
- Pipes in an attached garage with no heat
- Lines running through a crawlspace or unfinished basement corner
- Outdoor hose bibs with a hose still attached
- Pipes near a dryer vent or other opening that lets in cold air
Frozen Pipe Prevention Before a Cold Snap
Prevention is mostly about heat and pressure. A slow drip from the faucet at the end of an exposed line gives that trapped water somewhere to go, which is the whole point. It wastes a little water, and some people dislike that, but a burst pipe wastes a lot more.
A few simple habits cover most homes:
- Open the cabinet doors under sinks on outside walls during a cold night
- Keep the garage door closed if water lines run through that space
- Leave the thermostat set at a steady temperature, even overnight
- Disconnect garden hoses and shut off the valve that feeds outdoor spigots
- Keep the heat on when you travel in winter, and ask someone to check the house
What to Do When a Frozen Pipe Bursts
Finding a burst pipe is stressful, even when the leak looks small. First, shut off the main water valve. Every adult in the house should know where it is before winter, and honestly, many do not.
Next steps after the water is off:
- Turn off power to any area where water reaches outlets or fixtures
- Photograph the split pipe and the wet areas for your insurance claim
- Move rugs and boxes off the wet floor
- Call a plumber to repair the pipe itself
Plumbing repair and drying are two separate jobs. Once the pipe is fixed, a restoration crew can extract the standing water. After that, technicians measure moisture inside the walls and ceiling before they set up drying equipment. Water from a burst supply line is usually clean at first. That changes if it sits for a day or two, so starting early helps keep more materials in place.
It may seem odd that the worst part of a freeze often shows up on a sunny afternoon. It makes more sense once you know how the pressure builds. A little preparation in the fall can prevent most of it, and a quick response on thaw day can keep a small split from turning into a full ceiling replacement. Most homeowners only go through this once, and they rarely forget where the shutoff valve is afterward.
