Frozen Pipes: How to Prevent Them and What to Do If It Happens
Frozen pipes are one of the most preventable plumbing disasters in homeownership — and one of the most expensive when they happen. The average frozen pipe insurance claim runs ,000–0,000 when you factor in the burst pipe, water damage remediation, and structural repairs. And nearly every case was avoidable. Here's everything you need to know.
- Pipes are at serious risk when outdoor temps drop below 20°F
- Highest risk pipes: unheated spaces, outdoor spigots with hoses still connected, cabinet pipes against exterior walls
- Prevention: disconnect hoses, insulate pipes, let faucets drip, keep thermostat above 55°F
- To thaw safely: use a hair dryer, heating pad, or hot towels — never an open flame
- If a pipe has burst: shut off main water, document damage, call an emergency plumber, call insurance
How Pipes Freeze — And Why It's So Dangerous
When water inside a pipe freezes, it expands — increasing pressure by up to 2,000 PSI in a confined space. That pressure has to go somewhere. Sometimes it vents through a fitting. More often, it cracks or splits the pipe. The worst part: you usually don't know until the pipe thaws and water starts pouring through the crack. By then you may have had a cracked pipe sitting in your wall for days, slowly saturating insulation, drywall, and framing.
🧊 The danger zone: Pipes can begin freezing when outdoor temperatures drop below 20°F. The faster the temperature drops, the higher the risk — even insulated pipes in unheated spaces can be at significant risk.
Which Pipes Are Most at Risk
- Pipes in unheated spaces — garage, crawl space, basement exterior walls, attic
- Outdoor pipes and spigots — especially with a hose still connected
- Pipes along exterior walls — particularly in poorly insulated homes
- Pipes in cabinet spaces against exterior walls — kitchen and bathroom sinks
- Swimming pool and sprinkler supply lines — often overlooked in seasonal prep
How to Prevent Frozen Pipes
Disconnect Garden Hoses Before the First Freeze
A connected hose traps water in the line even with a frost-free spigot. Disconnect, drain, and store all hoses before temperatures drop below freezing.
Insulate Vulnerable Pipes
Foam pipe insulation wraps around pipes in garages, crawl spaces, and along exterior walls. For extreme cold, use electric heat tape on the most vulnerable sections.
Open Cabinet Doors Under Sinks
On nights when temperatures drop below 20°F, open cabinet doors under kitchen and bathroom sinks on exterior walls. This allows heated air to circulate around the pipes.
Let Faucets Drip
During extreme cold, let both hot and cold sides of faucets on exterior walls drip slowly. Moving water is much harder to freeze than still water. Costs pennies, saves thousands.
Keep the Thermostat Consistent
Maintain a minimum of 55°F at all times — even when traveling. The savings on your heat bill are not worth the risk of burst pipes.
Seal Drafts and Gaps
Cold air infiltrating through gaps near pipe penetrations can freeze pipes even when insulated. Seal gaps where pipes enter through exterior walls or foundation with expanding foam or caulk.
How to Tell If a Pipe Is Frozen
- Little to no water comes out when you open a faucet
- The faucet makes noise but produces no water
- Visible frost on exposed pipes in unheated areas
- One section of the home has water but others don't
How to Safely Thaw a Frozen Pipe
⚠️ Never use an open flame to thaw a pipe. Torches and propane heaters cause house fires every year. There are only safe methods — use those.
- Hair dryer — the safest and most effective tool for accessible pipes. Work from the faucet end toward the frozen section, keeping the dryer moving.
- Electric heating pad — wrap around the pipe and plug in. Safe for pipes behind cabinets.
- Hot towels — soak in hot water and wrap around the pipe. Replace as they cool.
- Space heater — position nearby to warm the ambient air. Never leave unattended.
Do not use a propane torch, blowtorch, heat gun, or any open flame. Do not try to thaw a pipe you cannot see — call a plumber.
If the Pipe Has Already Burst
Shut Off the Main Water Supply
Do this immediately — every second counts when water is flooding.
Turn Off the Water Heater
Prevents overheating without water supply.
Open All Faucets to Drain the System
Reduces residual water still in the pipes.
Document Everything
Photos and video of all damage before any cleanup — essential for your insurance claim.
Call an Emergency Plumber and Your Insurance Company
Do both immediately. Don't clean up or dispose of damaged materials until the adjuster has seen them.
💡 Smart technology that can help: Water sensors (0–0 each) alert your phone the moment a leak starts. Smart thermostats with freeze alerts notify you if your home temp drops below a set threshold. Automatic water shutoff valves detect unusual flow and shut off the main — can prevent a small burst from becoming a flood.
At what temperature do outdoor pipes freeze?
Pipes in unheated spaces or against exterior walls can begin freezing when outdoor temps drop below 20°F. In extreme cold snaps — single digits or below zero — the risk is severe and fast.
How long does it take for pipes to freeze?
It depends on the temperature, insulation, and whether water is moving or still. In severe cold, uninsulated exposed pipes can begin freezing within 1–2 hours. This is why prevention during a cold snap is so time-sensitive.
Will my insurance cover frozen pipe damage?
Most standard homeowner's policies cover sudden and accidental damage from burst pipes — including those caused by freezing. However, if the insurer can show that you failed to maintain adequate heat in the home, they may deny the claim. Keep your thermostat above 55°F and document it.
Dealing With Frozen or Burst Pipes?
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