Introduction
Frozen pipes are one of the most common and costly winter emergencies in New York City. When water freezes inside a pipe, it expands with tremendous force — up to 2,000 pounds per square inch — enough to split copper pipes, crack PVC, and rupture even cast iron. A single burst pipe can release hundreds of gallons of water per hour, causing catastrophic damage to your home and belongings. In NYC's older building stock, where pipes often run through uninsulated exterior walls, the risk is especially high. Understanding how to prevent pipe freezing and knowing what to do if it happens can save you thousands in repairs and untold stress.
Winter Tips for NYC Homes
Identify Your Most Vulnerable Pipes
Not all pipes freeze equally. The highest-risk pipes in NYC homes are those in exterior walls, unheated basements and crawl spaces, near windows, in garages, and in attic spaces. Pipes on the north side of buildings are more vulnerable than those on the south side. In pre-war NYC buildings, plumbing sometimes runs through exterior brick walls with little or no insulation. Map out where your most vulnerable pipes are located so you can focus your prevention efforts where they matter most.
Insulate Pipes in Unheated Spaces
Pipe insulation is your first line of defense against freezing. Foam pipe insulation sleeves are the most common solution — they slip over pipes easily and can be secured with tape. For pipes in especially cold areas, use fiberglass pipe wrap with a vapor barrier for greater insulation value. Heat cable or heat tape provides active freeze protection for the most vulnerable pipes, using a built-in thermostat to activate when temperatures approach freezing. These solutions are widely available at NYC hardware stores.
Maintain Consistent Heat Throughout Your Home
Even if you're leaving for vacation, never set your thermostat below 55 degrees Fahrenheit. In a cold snap, frozen pipes can occur within hours when indoor temperatures drop too low. Keep interior doors open to allow warm air to circulate to all rooms, especially those with plumbing on exterior walls. If your building has radiator heat, make sure all radiators are functioning — a cold room in an otherwise heated building creates a freeze risk for any pipes running through it.
Seal Air Leaks Near Pipes
Cold air infiltration is a major factor in pipe freezing. Small gaps where pipes penetrate exterior walls, foundation walls, or the sill plate allow frigid air to blow directly on vulnerable plumbing. Seal these gaps with spray foam insulation, caulk, or weatherstripping. In NYC's older buildings, check around the water meter area, where the main line enters from the street, and anywhere pipes pass through uninsulated walls. Eliminating even small drafts can prevent pipes from reaching freezing temperature.
Know the Warning Signs of Freezing
Recognizing early signs of pipe freezing lets you act before a burst occurs. Reduced water flow or a complete stoppage at a faucet when other faucets work fine is the most obvious sign. Frost visible on exposed pipes is another indicator. Unusual banging or clanking sounds when you turn on water can indicate partial ice blockage. If you notice any of these signs, act immediately — open the affected faucet to relieve pressure and apply gentle heat to the suspected frozen section.
What to Do When Pipes Freeze
If you discover a frozen pipe, open the faucet it serves to relieve pressure and allow water to flow once the ice melts. Apply gentle heat to the frozen section using a hair dryer, heat lamp, or warm towels. Never use a blowtorch, propane heater, or open flame — this can damage pipes and cause fires. Work from the faucet back toward the frozen section. If you can't locate the freeze or if a pipe has already burst, shut off the main water supply immediately and call a plumber. Keep our emergency number handy.