How to winterize a home and prevent frozen pipes in unheated spaces
Winterizing your home protects your comfort and prevents costly damage from frozen pipes. With a few focused tasks and some basic materials, you can reduce heat loss and keep water flowing in unheated spaces. Follow this step-by-step plan to prioritize the most impactful actions before cold weather arrives.
Step 1: Inspect and seal air leaks
Walk your home and feel for drafts around windows, doors, attics, and where plumbing pipes enter the house. Use low-expansion spray foam for gaps larger than 1/4 inch and silicone caulk for cracks less than 1/4 inch; weatherstrip doors with adhesive foam strips to reduce heat loss and limit cold air reaching pipes.
[Illustration: Person inspecting window and door seams with flashlight and caulk gun]
Step 2: Add insulation to unheated areas
Increase insulation in attics, crawl spaces, basements, and garage walls to at least R-30 in attics and R-13 in crawl spaces where climate-appropriate; use fiberglass batts or blown-in cellulose to reduce temperature swings that cause pipes to freeze.
[Illustration: Roll of fiberglass insulation being installed in attic joists]
Step 3: Insulate exposed pipes
Measure and cover exposed water pipes with foam pipe insulation sleeves sized to the pipe diameter; secure with tape and add heat tape on metal pipes in very cold areas, plugging heat tape into a GFCI outlet and following manufacturer guidelines for spacing and thermostat settings.
[Illustration: Hand wrapping foam pipe insulation around a copper pipe with tape]
Step 4: Protect outdoor faucets and hoses
Shut off and drain exterior spigots from inside using the shutoff valve; remove hoses and store them, then cap the spigot with an insulated cover to prevent remaining water from freezing and cracking the valve.
[Illustration: Person removing garden hose and installing foam faucet cover on exterior wall]
Step 5: Warm up unheated spaces strategically
Open interior cabinet doors under sinks and keep closet and garage doors closed to allow warmer house air to circulate around vulnerable pipes; during cold snaps, set the thermostat no lower than 55°F and use a space heater near at-risk plumbing only with clearances and a tip-over switch.
[Illustration: Open cabinet door under sink exposing plumbing and small space heater in nearby room]
Step 6: Maintain steady heat and monitor temps
Program your thermostat to maintain a consistent temperature day and night, avoiding large drops; install a remote thermometer in unheated rooms and check it during cold nights—aim to keep those spaces above 32°F to prevent freezing.
[Illustration: Digital thermostat display and small remote temperature sensor on shelf]
Step 7: Prepare for prolonged cold or power loss
Know how to shut off your main water valve and keep a wrench or key accessible; if freezing is forecasted for several days, consider draining interior pipes by opening taps and using compressed air to blow out lines, and have bottled water and pipe repair materials on hand.
[Illustration: Homeowner locating main water shutoff valve with wrench and stored bottled water]
- Label and test interior shutoff valves for exterior faucets before winter arrives to save time during emergencies.
- Use pipe insulation rated for outdoor use on exposed garage and crawl space pipes to withstand moisture and temperature swings.
- Apply spray foam around electrical and plumbing penetrations in the rim joist to reduce cold air entry where rodents can’t access it easily.
- Set smart thermostat vacation schedules to maintain a steady 55–60°F when you are away for several days.
- Keep gutters clear of debris to prevent ice dams that can introduce cold and moisture into attics.
- Check attic and crawl space vents—close or seal them only if you have adequate mechanical ventilation to avoid moisture buildup.
- Never wrap heating tape in a way that traps heat against flammable materials; follow manufacturer installation instructions to avoid fire risk.
- Do not use an unvented indoor ignition heater or gas oven to heat unheated spaces; this creates carbon monoxide and fire hazards.
- When using portable electric heaters near pipes, maintain at least 3 feet of clearance from combustibles and never leave them unattended during operation.
Was this guide helpful?
More Home & Garden guides
How to solder copper water pipes and replace a leaking compression joint
This guide walks you through soldering copper water pipes and replacing a leaking compression joint in a clear, step-by-step way. You’ll learn how to cut, clean, flux, solder, and reassemble a compression fitting so the joint becomes watertight. Follow safety tips and take your time—most DIYers finish a simple repair in 60–90 minutes.
How to install a ceiling fan with remote control and balance the blades
Installing a ceiling fan with a remote adds comfort and convenience to a room. This guide walks you through the main steps—from power off to balancing blades—so you can complete the job in about 2–4 hours with basic tools and a helper.
How to build and install a sturdy floating bookshelf on drywall
Building a sturdy floating bookshelf on drywall is an achievable weekend project that adds clean storage without visible brackets. With proper anchors, a solid cleat, and attention to level and load, you can support 50–100 pounds safely depending on materials. Follow these steps carefully and measure twice before cutting once.