Winter Freeze Protection: Lessons from the 2021 Crisis

The 2021 Winter Storm Context

In February 2021, Houston experienced a historic winter freeze. Temperatures dropped to single digits, and hundreds of thousands of Houston homes suffered burst pipes, causing billions in damage. Most homes were damaged because they lacked freeze protection—something normally unnecessary in Houston.

Since then, many Houston homeowners have learned this lesson the hard way. But if you haven't experienced a freeze yet, now is the time to prepare.

When to Worry About Freezing

In Houston, freezing risk occurs:

Late November through February
Watch weather forecasts for temperatures dropping below 32°F
Wind chill matters—pipes can freeze at 20°F or below
If temperatures stay in the 20s for more than a few hours, risk increases significantly

Prepare Your Pipes (Do This Now)

Locate Vulnerable Pipes

At-risk pipes:

Any exposed pipes in attics, crawl spaces, or garages
Outdoor faucets and hose bibs
Pipes along exterior walls (especially on north-facing sides)
Water supply lines in unheated spaces
Corner cabinets in kitchens and bathrooms (exterior walls)

Less at-risk pipes:

Interior walls (your home's insulation helps)
Pipes in basements (unless extremely cold)
Pipes near furnaces or water heaters

Install Foam Pipe Insulation

Measure your exposed pipes to determine how much insulation you need
Purchase foam pipe sleeves from hardware stores (cheap—$1-3 per foot)
Wrap the insulation around pipes, securing with tape if needed
Pay special attention to outdoor faucets—wrap completely with insulation or use a faucet cover ($5-10)
For extremely cold spells, add an extra layer of heat tape (electric, thermostat-controlled)

Weatherproof Your Home

Seal cracks and gaps around pipes entering your home
Insulate attic vents if pipes are exposed in attics (but keep airflow)
Caulk gaps around windows and doors
Ensure attic ventilation is not blocked by insulation (proper ventilation prevents ice dams)

Protect Your Pipes During a Freeze

When temperatures are predicted to drop below freezing:

Open Cabinet Doors

Open the doors under kitchen and bathroom sinks
This allows warm air from your home to circulate around the pipes
Especially important for corner cabinets (exterior walls)

Let Faucets Drip

Let cold water faucets drip slowly overnight
Even a trickle of moving water is less likely to freeze than stagnant water
This relieves pressure in the pipes if ice forms
Typically costs only pennies for the water usage

Increase Indoor Temperature

Keep your thermostat at 68°F or higher, even at night
Open interior doors to allow warm air throughout the house
This is your best defense for interior pipes

Shut Off Outdoor Water Supply (If Needed)

If temperatures are dropping to the low 20s or below for extended periods
Locate the outdoor water shut-off valve (usually near where the water line enters your home)
Close the inside shut-off valve and drain the outdoor line
Leave the outdoor faucet open to drain any remaining water
This prevents pressure buildup if outdoor lines freeze

If Your Pipes Freeze

Signs of frozen pipes:

No water coming out of a faucet
Reduced water pressure
Unusual gurgling sounds in pipes

Do NOT use:

Blowtorches, propane heaters, or open flame (fire hazard)
Hair dryers on high heat (can cause burns or fire)
Boiling water poured directly on pipes (can crack them)

DO use:

Wrap the frozen section with heating pads or blankets
Use warm (not hot) water applied to the outside of the pipe
Use a heat lamp positioned safely near the pipe
Open the faucet so water can flow as it thaws (relieves pressure)
Be patient—thawing can take 30 minutes to several hours

When to call a plumber:

If the freeze is in a wall (you can't access it)
If thawing methods aren't working after 4 hours
If you suspect the pipe has burst (water leaking inside walls or attic)

Houston-Specific Challenge

Most Houston homes were built for warm weather and lack adequate freeze protection. Especially vulnerable:

Older homes (pre-1980s) with exposed pipes in attics or crawl spaces
Homes in North Houston (higher elevation = colder temperatures)
Homes in East Houston (lower elevation and older construction)
Homes with poor attic insulation

If you live in an older Houston neighborhood like the Heights, Montrose, or older East End, you are at higher risk. Spend the $50-100 now on pipe insulation to avoid a $10,000 water damage claim later.

When to Call a Pro

Call a plumber to:

Insulate hard-to-reach pipes in your attic or crawl space
Install a main water shut-off valve (if you don't have one)
Install heat tape on vulnerable exposed pipes
Inspect your home's freeze-protection strategy (many will do a free consultation)
Assess whether you need additional insulation in attics or crawl spaces

Don't wait until the freeze warning—call in November or early December for service.