How to Prevent Frozen and Burst Pipes in Texas
The short version: Texas homes freeze-burst because supply lines run through unheated attics and exterior walls that were never built for cold. Before a hard freeze: insulate exposed pipes, disconnect hoses, and know your shutoff. During one: drip faucets on exterior walls, open cabinet doors, keep the heat on. If a line bursts anyway: shut the main, open a low faucet, and get extraction moving fast. February 2021's Winter Storm Uri damaged hundreds of thousands of Texas homes this exact way — and the pattern repeats in miniature every hard freeze.
Why Texas Homes Lose This Fight
In Minnesota, water lines run through heated interior spaces because builders assume cold. In San Antonio, builders assume heat: pipes run through attics, garages, and exterior walls with thin or no insulation, because 360 days a year that's harmless. In a multi-day freeze, water in those runs freezes and expands with enormous force; the pipe splits — often silently — and the flood starts at thaw. The burst itself is quiet; the ceiling coming down is not. (What that cleanup involves: burst & frozen pipe cleanup.)
Before the Freeze (Do These This Fall)
- Insulate exposed runs — foam sleeves on attic, garage, and exterior-wall pipes are cheap and take an afternoon. Prioritize the attic runs feeding upstairs bathrooms.
- Wrap outdoor faucets and disconnect garden hoses — a connected hose traps water in the hose bib and back into the wall line.
- Find your main shutoff now, not mid-crisis: most San Antonio homes have it in a ground box near the curb (buy the $10 meter key) or at a cutoff by the front hose bib.
- Service the water heater's surroundings — attic and garage water heaters benefit from insulated enclosures, and their supply lines from sleeves.
- Seal obvious drafts where pipes penetrate walls or the roof deck — moving cold air freezes pipes faster than still cold air.
During a Hard Freeze Warning
- Drip faucets served by exterior-wall or attic lines — moving water resists freezing, and the drip relieves pressure if ice does form. Both hot and cold sides.
- Open cabinet doors under sinks on exterior walls so room heat reaches the pipes.
- Hold indoor heat at 65°F or above, day and night, even if you leave — the savings from a cold thermostat are trivial next to a burst-pipe claim deductible.
- Garage door down if any plumbing runs through the garage.
- Traveling? Shut the main and open a faucet to relieve pressure before you go — the single best freeze insurance there is.
If a Pipe Bursts Anyway
- Shut the main immediately. Every minute open is more gallons in your walls.
- Open the lowest faucet in the house to drain line pressure.
- Kill power to rooms where water reached outlets or fixtures.
- Photograph everything, then start moving belongings out of the water's path — the first-24-hours guide has the full sequence.
- Call for extraction and a licensed plumber together — (210) 555-0199 coordinates both, 24/7, including during freeze events. Burst pipes are the classic covered peril; the insurance guide explains the claim.
A Note on PEX (Newer Homes)
PEX tolerates freezing better than copper — it flexes as ice expands — but its fittings and manifolds remain vulnerable, and 2021 burst plenty of PEX-plumbed homes across the newer suburbs. Material helps; prep still decides.
Sources
- American Red Cross — preventing and thawing frozen pipes
- Texas Department of Insurance — winter weather preparation
Related Guides
Freeze Prevention FAQs
At what temperature do pipes actually start to freeze?
Water freezes at 32°F, but a pipe inside a structure usually needs a sustained hard freeze before it is genuinely at risk — commonly cited as around 20°F held for several hours. Texas homes reach that threshold sooner than the forecast suggests, because so much plumbing runs through unheated attics and exterior walls where the local temperature tracks the outside air rather than the room. Treat a hard freeze warning as the trigger, not the indoor thermometer.
How much should the faucets drip, and which ones?
A steady trickle rather than an occasional drop — roughly the thickness of a pencil lead is the usual guidance. Prioritise fixtures fed by pipes running through attics, garages or exterior walls, which in most San Antonio homes means the bathrooms furthest from the water heater. Drip both the hot and the cold side, since both lines are exposed.
Should I shut the water off at the main if I leave town in winter?
It is the single most effective precaution available. Shut the main and open a faucet at the lowest point to relieve pressure, so that if a line does freeze there is somewhere for the expansion to go and no supply behind it. Leave the heat on at 55°F or above regardless — a closed main protects against flooding, not against a frozen line.
How do I thaw a pipe that is frozen but has not burst yet?
Open the faucet that pipe feeds so melting water can escape, then apply gentle heat from the faucet end working backwards — a hair dryer, warm towels, or a space heater kept well clear of anything flammable. Never use an open flame or a blowtorch. If you cannot reach the frozen section, or it runs inside a wall, shut the main and call a licensed plumber before it thaws on its own.
Freeze Coming, or Damage Already Done?
Burst-pipe crews and licensed plumbers, coordinated in one call — 24/7.
📞 Call (210) 555-0199