When temperatures drop below freezing, your plumbing becomes vulnerable to one of the most destructive winter problems: frozen pipes. A burst pipe can cause thousands of dollars in water damage, disrupt your household, and lead to mold growth if not addressed quickly. Understanding how to prevent frozen pipes can save you significant stress and expense during the cold months.
Why Pipes Freeze
Pipes freeze when water inside them turns to ice. As water freezes, it expands, creating tremendous pressure that can crack or burst even the strongest pipes. Pipes in unheated areas like basements, crawl spaces, attics, and garages are most at risk. Exterior walls and pipes with little or no insulation are also vulnerable points in your plumbing system.
Essential Prevention Tips
Insulate Exposed Pipes
Pipe insulation is your first line of defense. Foam pipe sleeves, fiberglass wrap, and heat tape can all help protect vulnerable pipes. Pay special attention to pipes in unheated areas and those running along exterior walls. Hardware stores carry affordable foam insulation that's easy to install yourself. For pipes in extremely cold areas, consider heated cable wraps that plug into an electrical outlet.
Keep Faucets Dripping
When temperatures plummet into the single digits or below, allow a small trickle of water to run from faucets connected to vulnerable pipes. Moving water is much harder to freeze than standing water. A slow drip from both hot and cold lines can prevent ice from forming inside your pipes overnight.
Open Cabinet Doors
Kitchen and bathroom cabinets often contain pipes along exterior walls. Keep these cabinet doors open during cold snaps to allow warm air to circulate around the pipes. This is especially important in bathrooms and kitchens on outside walls. If you have children or pets, remember to remove any cleaning products or chemicals from these areas.
Maintain Consistent Indoor Temperature
Keep your thermostat set to the same temperature day and night. While it might seem economical to lower the heat while you sleep or are away, the savings can be quickly offset by a burst pipe. If you're leaving for an extended period during winter, never set the thermostat below 55 degrees Fahrenheit.
Signs Your Pipes Are Frozen
Recognizing frozen pipes early can prevent catastrophic failure. Watch for reduced water flow from faucets, strange odors from drains, and frost visible on exposed pipes. If you turn on a faucet and only a trickle comes out, your pipes may already be frozen. In our guide to detecting hidden water leaks, we discuss additional warning signs to watch for throughout your plumbing system.
What to Do If Pipes Freeze
If you discover frozen pipes, act quickly but carefully. Turn off the main water supply to prevent flooding if a pipe has already cracked. Apply gentle heat using a hair dryer, space heater, or towels soaked in hot water. Never use open flames, blowtorches, or kerosene heaters to thaw pipes—these create fire hazards and can damage your plumbing. Start from the faucet and work toward the frozen area.
If you cannot locate the frozen area or if a pipe has burst, it's time to call a professional. Our article on when to call an emergency plumber can help you determine the severity of your situation.
Long-Term Protection
For lasting protection, consider having a professional assess your plumbing. They can identify vulnerable areas, recommend permanent insulation solutions, and install frost-free hose bibs on exterior faucets. If you have older pipes, this might also be a good time to discuss replacement options. Areas like Los Angeles and similar climates still experience occasional freezes that can catch homeowners off guard.