If you turn on a faucet during a Houston freeze and nothing comes out—or only a trickle—you likely have a frozen pipe. The critical question is not whether the pipe is frozen, but whether it has already burst. A frozen pipe that has not burst yet can be thawed safely. A burst pipe that is still frozen will release water the moment it thaws. Distinguishing between these two situations determines your immediate response.
Step 1: Shut Off the Main Water Supply
Before you do anything else, shut off your home’s main water supply. Turn it off even if you do not yet know whether a pipe has burst. Here is why: if the pipe has already cracked and is currently frozen—which prevents water from flowing—it will release that water the moment it thaws. Shutting off the main now prevents a small crack from becoming hours of uncontrolled water discharge into your walls and floors while you are asleep or away.
Houston main water shutoffs are typically located: near the water meter at the front of the property, where the main supply line enters the house (often the garage or utility room), or sometimes in a utility closet. Turn clockwise to close. If the valve is stuck, call a plumber before attempting to force it.
Step 2: Identify Which Pipes Are Frozen
Open faucets throughout the house. Rooms where no water comes out even with the main open (before you shut it) point to the frozen section. In Houston homes, the most common frozen locations are: attic supply runs (hot water supply lines in attics are particularly vulnerable because they contain warm water that cools rapidly once the attic temperature drops), irrigation system connections at the exterior, garage utility connections, and pipes along exterior walls in utility rooms or laundry spaces.
Step 3: Thaw Frozen Pipes Safely
If you have identified a frozen section and confirmed it has not burst, gentle warming can thaw it. Safe methods:
- Electric heating pad: Wrap around the frozen section and set to low. Monitor continuously.
- Hair dryer on low setting: Directed at the frozen pipe section, moving constantly. Do not leave unattended.
- Warm towels: Soak towels in warm (not boiling) water and wrap around the pipe. Refresh as they cool.
Never use: open flame (torch, lighter), high-temperature heat gun, or boiling water directly on pipes. Rapid temperature change can crack already-stressed pipe material and create a fire hazard.
Begin thawing at the faucet end of the frozen section, not the supply end. This allows water and steam to escape as the ice melts rather than building pressure behind the thawing section.
Step 4: Inspect for Burst After Thawing
Once the pipe begins flowing, restore the main water supply slowly. Walk every room looking and listening for water. Check ceilings directly below attic pipe runs—water staining or sagging drywall indicates a burst that released water while frozen. Check behind walls near the thawed section for wet drywall, soft spots, or discoloration. If you find evidence of a burst, shut the main off again immediately and call a plumber and a water damage restoration company.
If You Cannot Reach the Frozen Section
Attic pipe runs and pipes inside wall cavities cannot be safely thawed by homeowners. In these cases: keep the main water shut off, call a plumber to access and thaw the pipe professionally, and keep the home’s thermostat at maximum to raise the attic and wall cavity temperature as quickly as possible. Do not attempt to access attic pipe runs during a freeze event—attic surfaces are cold, potentially icy, and the risk of injury is significant.
Frequently Asked Questions
How do I know if my pipe has burst versus just frozen?
While the pipe is still frozen, you may not be able to tell. Visible deformation of the pipe, wet insulation around the pipe section, ice forming outside the pipe, or water staining on nearby surfaces are signs of a burst. A pipe that appears intact and shows no moisture may still be cracked but not yet leaking because the ice is acting as a plug. This is why shutting off the main before thawing is critical—it prevents the crack from releasing water the moment it thaws.
How long will it take for pipes to thaw naturally in Houston?
Pipes in accessible interior locations will typically thaw within 1 to 3 hours once the home is at normal temperature and outdoor temperatures rise above freezing. Attic pipe runs may take longer because attic temperatures lag behind outdoor recovery—even after outdoor temps rise above freezing, an attic that dropped to 10°F during a multi-day freeze may stay below freezing for another 6 to 12 hours. During a sustained freeze event where temperatures remain below freezing for multiple days, natural thawing does not occur and active intervention is required.
247 Restoration Specialists responds to frozen and burst pipe water damage throughout Houston 24/7—including during active freeze events. IICRC-certified. Direct insurance billing. Call immediately if you suspect a burst.