Winter Pipe Burst Prevention for Long Island Homes

Long Island winters are mostly mild — but every year brings a handful of cold snaps that drop temperatures into the single digits. Those nights are when pipes burst. A 1/8-inch crack in a frozen pipe releases 250+ gallons of water per hour. Most of the burst-pipe damage we respond to in January and February is preventable with steps that take an hour or less to complete in the fall.

Why Pipes Burst in the Cold

Water expands about 9% when it freezes. In a confined pipe, that expansion has nowhere to go. Pressure between the ice plug and any closed valve or fixture builds rapidly until the pipe ruptures — usually at a fitting, joint, or weakest point.

Counter-intuitively, the burst itself often happens after pipes start thawing — not while they are frozen. The ice plug holds the pressure; the rupture appears when water can flow again. This is why pipe failures often happen the day temperatures climb back above freezing.

Long Island\'s Highest-Risk Pipe Locations

The pipes that fail most often are in:

• Unheated basements — especially supply lines running along exterior walls
• Crawl spaces — exposed pipes in unconditioned spaces under the home
• Attics — supply lines or fixture connections in unheated attics
• Exterior walls — pipes running through walls without adequate insulation
• Garages — laundry rooms, water heaters, or supply lines in attached garages
• Outdoor faucets and irrigation — hose bibs that did not get winterized
• Pipes near foundation vents — cold air infiltration in older homes

Fall Preparation Checklist

Do these things before the first hard freeze (typically mid-November on Long Island):

1. Winterize outdoor faucets

Disconnect garden hoses. Drain hose bibs by opening them after shutting off interior valves. Install foam hose-bib covers on exposed faucets. Drain any irrigation systems and shut off the supply.

2. Insulate exposed pipes

Foam pipe insulation is inexpensive ($1-3 per foot at hardware stores) and dramatically reduces freezing risk. Cover all exposed supply lines in basements, crawlspaces, attics, and unheated areas. Pay extra attention to pipes within 3 feet of exterior walls.

3. Add heat tape to highest-risk locations

For pipes that have frozen before, heat tape with a thermostat provides active heating during severe cold. Plug it in for the season; it kicks on automatically when temperatures drop. UL-listed heat tape is safe and effective.

4. Seal drafts near pipes

Cold air infiltration around pipes is what causes them to freeze. Caulk around foundation penetrations, seal gaps in basement rim joists, and weatherstrip basement windows and doors.

5. Locate your main shut-off valve

Find it. Operate it. Tag it with a label. Make sure every adult in the household knows where it is and how to use it. When a pipe bursts at 2 AM, you do not want to be searching for the shut-off in the dark.

During Cold Snaps

When temperatures drop below 20°F:

Open cabinet doors

Pipes under sinks (especially on exterior walls) freeze less when warm room air can reach them. Open cabinet doors under all bathroom and kitchen sinks during cold nights.

Let faucets drip

A pencil-thin trickle from faucets on exterior walls keeps water moving. Moving water resists freezing much better than still water. The cost of running a slight drip overnight is much less than the cost of a burst pipe.

Maintain heat throughout the home

Do not lower the thermostat below 60°F at night during severe cold, even in unused rooms. Set thermostats consistently — sudden drops cause more freezes than steady cool temperatures.

Open interior doors

Letting heat circulate freely throughout the home prevents cold pockets from forming. Especially relevant in homes with closed-off guest rooms, basements, or attached garages.

If leaving home for travel

Set the thermostat to at least 60°F (lower than this is risky). Have someone check the home daily during cold weather. Consider shutting off the main water supply if leaving for more than a few days during severe cold.

What to Do If a Pipe Freezes (Before It Bursts)

If you discover a frozen pipe before it ruptures:

1. Locate the freeze — usually a section that feels colder than surrounding pipe, sometimes with visible frost
2. Open the nearest faucet downstream of the freeze — this gives the water somewhere to go as the ice melts and reduces pressure buildup
3. Apply heat to the frozen section — hair dryer, heating pad, or warm towels. Do NOT use open flames or torches. Work from the faucet end back toward the cold area.
4. Watch for leaks as the pipe thaws — the rupture (if any) appears when water can flow again
5. If you cannot locate the freeze or it does not thaw within 30 minutes, call a plumber

If a Pipe Has Already Burst

Move fast:

1. Shut off the main water valve immediately
2. Cut power to affected areas if water is near electrical fixtures
3. Document the damage with photos before cleanup
4. Call professional restoration — our crews arrive in 30 minutes with licensed plumbers and water-extraction equipment
5. Call your insurance carrier after restoration is dispatched

The same burst pipe addressed in 30 minutes versus 4 hours later can be the difference between a $2,500 cleanup and a $15,000 restoration. Detailed first-10-minutes guidance is here.

Insurance Coverage

Burst pipes are one of the most commonly covered events under standard New York homeowners policies. Sudden, accidental water damage from inside the home is the textbook covered scenario. We document the failure, bill insurance directly, and most homeowners pay only their deductible.

One important note: insurance companies sometimes scrutinize burst-pipe claims to determine whether the freeze was due to homeowner negligence (e.g., turning off the heat while away from home). Maintaining the home at reasonable temperatures during cold weather is a basic policyholder responsibility. Adequate documentation of preventive maintenance is a good insurance habit.

The Math on Prevention

Foam pipe insulation for an entire basement: $50 to $150. Heat tape for high-risk pipes: $40 to $100. An hour of fall prep work: free.

Average burst-pipe restoration on Long Island: $4,000 to $15,000. Insurance deductible: $500 to $2,500. Time without normal use of part of your home: 1 to 3 weeks.

Prevention pays back roughly 100x. Spend an hour this fall and skip the headache this winter.