Treasure Valley winters are deceptive. We'll go weeks in the 30s and 40s, then drop into single digits or below zero for three or four nights in a row, and that's when pipes burst. A single frozen pipe can dump hundreds of gallons of water into a wall, ceiling, or crawlspace, causing thousands of dollars in damage. Here's exactly what Boise-area homeowners should do to prevent it.
Why Pipes Burst
Water expands roughly 9% when it freezes. When ice forms inside a pipe, pressure builds between the ice plug and a closed faucet. That pressure, not the freezing itself, is what splits the pipe. Damage often appears once the pipe thaws and water begins flowing again, which is why most "discovery" calls happen on the first warm afternoon after a hard freeze.
Which Pipes Are Most at Risk
Exterior hose bibs and the supply line behind themPipes in unheated garages, crawlspaces, and atticsPipes running through exterior walls (especially on the north and west sides)Lines feeding outdoor kitchens, pool equipment, and detached structuresOlder galvanized lines in pre-1970 Boise homesBefore Winter Hits
Disconnect and drain every garden hose. A connected hose holds water in the bib and lets ice migrate back into the wall.Install frost-free hose bibs if you don't already have them. Standard hose bibs in this climate are a freeze waiting to happen.Insulate exposed pipes in garages, crawlspaces, and attics with foam pipe sleeves or heat tape.Locate your main water shutoff and make sure it operates. A stuck valve during an emergency is its own disaster.Seal foundation vents, crawlspace access, and gaps where cold air infiltrates pipe runs.During a Cold Snap
When the forecast drops below 20°F overnight:
Open cabinet doors under kitchen and bathroom sinks on exterior walls so warm room air can reach the pipes.Let cold-water faucets drip on the coldest-rated wall. Moving water resists freezing.Keep the thermostat at 60°F or higher overnight, even if you're away.Open the garage door as little as possible if it contains water lines.If a Pipe Freezes
If you turn on a faucet and only a trickle comes out, you likely have a frozen line. Act fast:
Leave the faucet open, flowing water helps melt the ice plug.Apply gentle heat to the suspected frozen section: a hair dryer, heating pad, or warm towels. Never use a torch or open flame.Work from the faucet end back toward the cold area.If you can't locate the freeze or thaw it within 30 minutes, call us, and know where your main shutoff is in case the pipe has already split.If a Pipe Has Burst
Shut off the main water valve immediately.Open all faucets to drain remaining pressure.Cut power to circuits near the leak if water is near outlets or fixtures.Call Mountain Time Plumbing. We run heavy schedules during freeze events and prioritize active leaks.Long-Term Fixes
If you've had repeated freeze problems, the root cause is usually pipe routing through exterior walls or unconditioned space. Rerouting vulnerable lines into conditioned space during a remodel or repipe permanently solves the problem and adds resale value. We've rerouted dozens of Boise and Eagle homes after January freezes.
Get Ahead of the Next Cold Snap
Mountain Time Plumbing offers winterization inspections across the Treasure Valley, frost-free bib installs, pipe insulation upgrades, shutoff valve replacement, and crawlspace sealing. Call (208) 993-0717 to schedule.
Need Plumbing Help in the Treasure Valley?
Same-day service and upfront pricing across Boise, Meridian, Eagle, Nampa, and beyond.
