Emergency Guide · Frozen Pipes

Frozen Pipes — Thaw Safely & Prevent Bursts

Pipes freeze fast in cold snaps — but burst when they thaw. Here's how to handle it without flooding your home.

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First 24 Hours

What To Do Right Now

The first day determines whether this is a $5,000 problem or a $50,000 reconstruction. Follow these steps in order.

1

Locate the frozen section

Open every faucet partially. The one with no flow (or a trickle) tells you which line is frozen. Trace it back along the supply route — usually exterior walls, attics, basements, or unheated crawl spaces.
2

Open the frozen-line faucet fully

When the ice thaws, water needs somewhere to go besides splitting your pipe. Open both hot and cold sides on the affected fixture before applying heat.
3

Apply heat from inside out

Hair dryer, heat lamp, electric heating pad, or space heater. Start at the faucet end and work back toward the frozen section. Never use open flame — propane torches cause house fires every winter.
4

Don't leave heat sources unattended

Once you start thawing, stay with it. Pipes can hide other problems (cracks from earlier freeze events) that release suddenly when thawing completes.
5

Be ready to shut off the main

Have the location and a wrench within reach. The moment the thaw water surges, you have seconds to spot a burst and shut down before serious flooding.
6

Inspect for splits after thawing

Many freeze cracks are small — a hairline split that drips slowly at first. Check the entire run for moisture for at least an hour after flow returns.
7

If pipe burst, call restoration immediately

Frozen-pipe bursts often happen behind walls, in attics, or in crawl spaces — places where leaks aren't visible. By the time water shows on the ceiling, hundreds of gallons may already be in the structure.

Common Causes

Why This Happens

Sudden temperature drops below 20°F

Pipes can begin to freeze when sustained temperatures hit 20°F, especially with wind chill. The most catastrophic damage occurs when temperatures drop fast — homes don't have time to heat up exposed plumbing.
Pipes in unheated spaces

Attics, crawl spaces, garages, basements without heat, exterior walls without proper insulation. Anywhere the pipe sees outdoor-influenced temperature.
Inadequate insulation

Original insulation in older homes (pre-1980) is often half what current code requires. Pipes that worked fine in mild winters fail during polar vortex events.
Air leaks near pipes

Gaps around plumbing penetrations let outdoor cold reach pipes through what's effectively a thermal short-circuit. Even insulated pipes freeze if the wall has air leaks.
Vacancy without heat

Homes left at 45°F or below during winter trips are extremely vulnerable. Many policies exclude freeze damage in vacant unheated homes — read your policy.
Outdoor faucets and irrigation

Hose bibs and irrigation lines that weren't drained before winter. Frost-free faucets help but don't solve the problem if a hose was left attached.

Early Warning Signs

How To Spot The Damage Early

Reduced water flow at one or more faucets during cold weather
Frost visible on exposed pipes
Pipes feel ice-cold even where insulation is present
Whistling or banging when faucets are opened (air or partial ice)
Bulging in pipe segments (visible expansion from internal ice)
Cold drafts at plumbing penetrations through walls
Past freeze events — homes that froze once usually freeze again

Avoid These Mistakes

What NOT To Do

These mistakes turn manageable losses into reconstruction projects. We see them every week.

Don't use a propane torch or open flame

House fires from torch-thawing are a winter staple of fire department calls. Always use enclosed heat — hair dryer, heating pad, space heater.
Don't pour boiling water on pipes

The thermal shock can crack already-stressed pipes. Even if it doesn't, the boiling water cools fast and refreezes downstream.
Don't leave thawing pipes unattended

Burst pipes during thawing can release hundreds of gallons in minutes. Stay with the heat source until full flow is restored and you've checked for leaks.
Don't ignore one frozen pipe

If one froze, the conditions that froze it haven't changed — others may freeze tonight or tomorrow. Address insulation and warm air access before the next cold snap.
Don't crank the heat to 90°F to thaw faster

Thermal expansion stress on pipes goes the other way too. Steady, gradual warming is safer than aggressive heat blasts.
Don't assume insurance covers vacant-home freezing

Most policies exclude freeze damage when the home was vacant without heat. Check your policy before relying on coverage for second homes or rental properties.

When DIY Isn't Enough

When To Call A Professional

Call a plumber if (1) you can't locate the frozen section, (2) the pipe is inside a finished wall and inaccessible, (3) you've thawed and the pipe shows leaking or bulging, or (4) multiple pipes are frozen and you need triage. Call a restoration company if a pipe has burst and water has been released — even if you've stopped the flow, the existing water in the structure needs immediate professional extraction. The two often work together: plumber repairs the pipe; restoration handles the water damage.

Prevention

How To Avoid This Next Time

Most water damage events are preventable with simple maintenance. Here's the playbook.

Insulate every pipe in unheated space

Foam pipe insulation ($0.50–$1.50/ft), heat tape ($30–$80 per pipe), or both for high-risk areas. Cost is trivial compared to a single burst.

Seal air leaks near pipes

Caulk and spray foam at every plumbing penetration. Cold air infiltration freezes pipes faster than ambient temperature alone.

Maintain 55°F minimum, even when traveling

Smart thermostats with low-temperature alerts give peace of mind during winter trips. Cost: free to $250.

Drip faucets in sub-freezing weather

A pencil-thin stream prevents pressure buildup. Open the faucets on exterior walls and any pipe known to be exposed.

Open cabinet doors under sinks

Lets warm room air reach pipes against exterior walls. Free, easy, effective.

Drain outdoor faucets and irrigation in fall

Disconnect hoses, shut interior valves, drain the outdoor side. Frost-free faucets help but aren't foolproof if a hose stays attached.

Add heated pipe sleeves for high-risk runs

Self-regulating heat cable wraps around pipes and only heats when below freezing. $50–$150 per pipe; pays for itself the first burst it prevents.

Install whole-house water leak detection

Flo by Moen, Phyn, StreamLabs — they detect anomalies and auto-shutoff. Many insurers offer 5–10% discounts.

Cost Breakdown

What Does This Cost?

Item	Range
DIY thaw materials (heat tape, insulation)	$50 – $200
Plumber thaw service (no burst)	$200 – $500
Pipe repair (single split)	$200 – $1,500
Frozen-burst extraction & drying	$3,000 – $10,000
Drywall and ceiling repair	$1,500 – $5,000
Total burst-pipe restoration (typical)	$5,000 – $25,000

Pure thaw service (no burst) is inexpensive and often DIY-able. The real cost arrives if a pipe bursts during thaw — averaging $10,000–$15,000 in US restoration claims. Insurance generally covers burst pipe damage if the home was occupied and heated.

See full pricing breakdown across all services

Insurance Claim Process

How Insurance Works For This Loss

Frozen pipe burst damage is covered under standard homeowners insurance IF the home was occupied and adequately heated at the time. The exception is vacant homes without heat — most policies exclude this. Read your policy's 'freeze' or 'occupancy' provision carefully if you have a second home or rental property. When the loss is covered: claim process is identical to any burst pipe — notify within 24–72 hours, document everything, mitigate immediately, work with adjuster. Documentation should include the indoor temperature at time of loss (if known) and proof of occupancy. Smart thermostat data logs are gold here — they prove the home was heated.

How we handle your insurance claim

Restoration Timeline

How Long Does Restoration Take?

1

Diagnosis
30 minutes – 2 hours

Locate frozen section, plan thawing approach
2

Thawing
1 – 6 hours

Apply heat slowly while monitoring for leaks
3

Repair (if burst)
1 – 4 hours

Plumber fixes split or replaces section
4

Water mitigation (if burst)
Same day

Extraction begins immediately to prevent secondary damage
5

Drying
3 – 5 days

Standard structural drying with daily monitoring
6

Reconstruction
1 – 3 weeks

Drywall, flooring, paint replacement as needed

FAQ

Frozen Pipes Questions

How cold does it have to be for pipes to freeze?

Sustained temperatures below 20°F start to freeze poorly insulated pipes. Wind chill matters too — exposed pipes can freeze at 32°F in 30+ mph wind. Insulated pipes inside heated homes generally don't freeze unless the heat fails.

Can I prevent pipes from freezing by leaving the heat at 60°F?

Better than turning it off, but 55°F is the standard recommendation, and pipes against poorly insulated exterior walls may still freeze even at 60°F if there's wind. Drip faucets in extreme cold.

How long does it take a frozen pipe to burst?

Variable. Some pipes split as the ice forms (within hours of freezing); others survive freezing intact and only burst when thawing causes pressure surges. The peak burst risk is during the thaw, not the freeze itself.

Should I call a plumber or do it myself?

DIY is fine for accessible pipes (under sinks, exposed in basement) where you can apply heat directly. Call a plumber for pipes in walls, ceilings, or high-risk locations. Always call if a burst is suspected.

Is freeze damage covered by insurance?

Yes for occupied homes with adequate heat. Often excluded for vacant homes left unheated. Read your policy and document occupancy if you travel during winter.

How do I know if a frozen pipe has burst?

Reduced or no water flow, water staining on ceilings or walls, pooling on floors, sound of running water with no fixtures on, dramatic increase in water bill. Most freeze bursts hide inside walls and only show after significant damage.

What's the difference between freeze damage and burst damage?

Frozen pipes that don't burst are usually no-cost beyond the thawing inconvenience. Burst pipes release significant water and trigger full restoration claims. The category matters for insurance classification.

Will heat tape solve the problem?

For known high-risk pipes, yes — self-regulating heat cable is highly effective at preventing freezing. Combine it with proper insulation for best results. Cost: $50–$150 per pipe.

Why do pipes burst when they thaw, not when they freeze?

Ice forms downstream of the freeze point first, creating a pressure-sealed water column between the ice and the closed faucet. Thawing releases pressure suddenly, causing a surge that ruptures whatever's weakest.

Should I let outdoor pipes freeze and just not use them?

No — even unused pipes can split and require repair. Drain them properly each fall: disconnect hoses, shut interior valves, drain outdoor side, and consider installing frost-free hose bibs.

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