How to Prevent Frozen Pipes Before Cold Weather

A frozen pipe usually does not announce itself when temperatures fall. The trouble often starts in an unheated crawlspace, a wall behind a sink, or a vacant commercial suite, then becomes obvious only after the pipe thaws and water begins leaking. Taking a few practical steps to prevent frozen pipes can protect your property from water damage, disrupted operations, and an urgent repair call.

In the Kelso-Longview area and across the Lower Columbia region, winter weather can bring sharp overnight freezes even when daytime temperatures rise above freezing. That cycle is hard on exposed plumbing. Preparation works best when it is done before the first sustained cold spell, not when a faucet has already stopped running.

Why Pipes Freeze in Otherwise Heated Buildings

Pipes freeze when the water inside them loses enough heat to reach 32 degrees Fahrenheit. Outdoor hose bibs and exposed pipes are obvious risks, but many frozen-pipe problems begin in places property owners overlook: crawlspaces, attics, garages, exterior walls, cabinets beneath sinks, and utility rooms with poor insulation.

A building can feel comfortable while a small section of plumbing is cold enough to freeze. Warm air may not reach an exterior bathroom wall, a pipe may sit near a foundation vent, or a draft may enter through an opening around wiring or plumbing. Older homes and remodeled buildings can be especially vulnerable when pipe routes pass through unfinished or poorly insulated areas.

Commercial properties have additional concerns. A vacant office, warehouse restroom, tenant space, or rarely used mop sink can go unnoticed for days. If the heat is lowered too far or a heating system fails after hours, water lines in those areas can freeze before anyone sees the warning signs.

How to Prevent Frozen Pipes at Home

The most dependable approach combines insulation, controlled heat, and regular checks. One measure helps, but several layers of protection give you a better margin when temperatures drop unexpectedly.

Insulate exposed plumbing

Insulate pipes located in crawlspaces, garages, attics, utility rooms, and other unconditioned spaces. Foam pipe insulation is a practical option for accessible lines, particularly copper, PEX, and CPVC supply pipes. Fit insulation closely, secure the seams, and pay attention to elbows, valves, and short sections near exterior walls.

Insulation slows heat loss, but it does not create heat. A pipe in a severely cold space may still freeze, so insulation should be paired with other measures when temperatures are expected to remain below freezing.

Outdoor hose bibs need attention as well. Disconnect garden hoses before winter, drain the hose, and close the interior shutoff valve if your plumbing system has one for the outdoor faucet. After shutting off the valve, open the exterior faucet to drain remaining water from the line. An insulated faucet cover can add protection, but it should not replace draining the line.

Keep indoor temperatures steady

Keep your thermostat at a consistent temperature day and night during freezing weather. Lowering the heat significantly while sleeping, traveling, or leaving a property vacant may save a small amount on energy costs, but the cost of a burst pipe can be far greater.

For an occupied home, setting the thermostat no lower than 55 degrees Fahrenheit is a common minimum during winter absences. The right setting depends on the building, insulation levels, pipe locations, and outdoor forecast. Properties with plumbing in crawlspaces or exterior walls may need a higher setting.

Avoid relying on a space heater as the primary way to protect plumbing. If used at all, it should be a temporary, attended measure in accordance with the manufacturer’s directions. Space heaters create fire risks when placed near combustible materials or left unattended.

Let warm air reach vulnerable areas

Open cabinet doors beneath kitchen and bathroom sinks when a hard freeze is expected, especially on exterior walls. This allows heated room air to circulate around the pipes. Keep cleaning supplies, chemicals, and other hazardous materials secured and out of reach of children and pets before opening cabinets.

Close doors and windows fully, repair damaged weatherstripping, and seal obvious gaps around pipe penetrations, vents, and utility openings. The goal is not to make a building airtight at the expense of needed ventilation. It is to stop cold drafts from reaching plumbing where they should not.

If you have a crawlspace, verify that access doors are closed and intact. Damaged skirting, missing vent covers where appropriate, or loose access panels can allow cold air to move directly across exposed plumbing. Crawlspace ventilation and moisture control should be evaluated carefully because closing vents is not the right answer for every building or season.

Use a small faucet drip when conditions require it

During a severe cold snap, letting a vulnerable faucet run at a slow drip can help keep water moving through the pipe. Use this tactic for faucets served by plumbing near exterior walls or in unheated spaces. Both hot and cold lines may be at risk, so a faucet set near the middle temperature position can allow a slight flow from each side on many fixtures.

A drip uses water, so it should be a short-term measure for freezing conditions, not a substitute for repairs, insulation, or proper heating. If you rely on it frequently, ask a qualified plumbing professional to identify why that section of pipe is so exposed.

Protecting Vacant Homes and Commercial Properties

An occupied home has one advantage: people notice temperature changes, water stains, and plumbing problems quickly. Vacant homes, rental units between tenants, and commercial buildings may not. A written winter plan is worth having before cold weather arrives.

Start by identifying who is responsible for checking the property, how often it will be checked, and what temperatures require action. Confirm that the heating system is operational, thermostat batteries are fresh if applicable, and utility service will remain active. For commercial properties, include maintenance staff, property managers, and tenants in the communication plan so an after-hours problem reaches the right person quickly.

Remote temperature and leak alerts can provide an added layer of protection, particularly in properties that are empty overnight or for extended periods. These devices are useful, but they still need a response plan. An alert at 2 a.m. only helps if someone can access the building, shut off water when necessary, and arrange repairs.

For a long-term vacancy, winterizing the plumbing may be the better choice. This can involve shutting off the water supply, draining lines, and protecting fixtures and traps according to the property’s needs. Winterization should be handled carefully. Improperly drained lines or missed fixtures can still freeze, and some systems require professional service to avoid damage.

Warning Signs You Should Not Ignore

A faucet that only produces a trickle, no water from one fixture, frost on visible piping, unusual odors near a drain, or a sudden drop in water pressure can point to a developing freeze. Do not assume the issue will resolve itself once the sun comes out. A frozen section can expand and crack a pipe even if water is not yet leaking.

If you suspect a pipe is frozen, leave the affected faucet open and apply gentle heat to the accessible section of pipe. A hair dryer, heating pad, or warm towels may be appropriate for a pipe you can safely reach. Start near the faucet and work back toward the colder area so melting water has a path to escape.

Never use an open flame, propane torch, or other direct high-heat source on plumbing. These methods can damage pipe materials, ignite nearby construction materials, or create a more serious emergency. Do not try to thaw a pipe that is inaccessible inside a wall or ceiling without professional help.

If a pipe has burst or you see active leaking, shut off the building’s main water supply if it is safe to do so. Turn off electrical power only if water is near electrical equipment and you can do so safely from a dry location. Then contact a qualified plumbing professional for emergency service. Fast action limits the amount of water that can enter walls, flooring, insulation, and finished spaces.

Address the Building Condition, Not Just the Frozen Pipe

A repaired pipe solves the immediate leak, but the underlying cause still matters. If a line froze because of missing insulation, a persistent draft, poor crawlspace access, inadequate heat, or a plumbing route through an exterior wall, the same area can fail again during the next cold spell.

This is where a full-service contractor can simplify the repair. The solution may require plumbing work along with insulation repairs, wall access, weather sealing, electrical evaluation for heat tape, or general construction to restore damaged finishes. Cascade can coordinate these related scopes for homeowners, businesses, and project teams that need the problem addressed without managing multiple contractors.

Heat tape and heat cable can be useful for certain exposed pipes, but installation must match the pipe material and product instructions. Electrical protection, correct placement, and periodic inspection are essential. This is not a place to improvise, particularly in damp crawlspaces or around older wiring.

Before the next freeze, take a walk through the areas of your property that are easy to forget: the crawlspace, garage, utility room, exterior hose connections, vacant suites, and cabinets on outside walls. A few minutes spent finding cold, exposed, or drafty plumbing now can keep a winter cold snap from becoming a much larger repair.