How to Protect Your Pipes When a Hard Freeze Hits Houston

Every Houstonian who lived through February 2021 remembers what a hard freeze can do to this city's plumbing. Homes here are built to shed heat, not hold it — pipes run through attics, exterior walls, and uninsulated crawl spaces that never expected single-digit wind chills. When the next Arctic front lines up on the forecast, this is the checklist we give our own families.

Why Houston pipes burst when northern pipes don't

It isn't that our pipes are worse — it's where they are. In cold climates, water lines are buried deep and routed through conditioned space by code. In Houston, it's common to find supply lines in vented attics, garage ceilings, and exterior walls with little insulation, plus pool equipment, sprinkler backflow preventers, and outdoor faucets fully exposed.

When water freezes it expands roughly nine percent, and trapped ice generates enormous pressure in a sealed line. The pipe often splits quietly while frozen — the flood comes hours later, during the thaw, when everyone thinks the danger has passed.

Before the freeze: the 24-hour checklist

Outside

• Disconnect garden hoses — a connected hose traps water in the faucet and the pipe behind it. This is the most common, most preventable freeze break in Houston.
• Cover exterior faucets with insulated covers (or, in a pinch, towels inside a plastic bag, taped tight).
• Wrap exposed pipe — foam sleeves on anything visible: pool equipment lines, water softener loops, the pipe to the sprinkler backflow preventer. For the backflow preventer itself, insulate it or shut off and drain the irrigation system entirely.
• Know your main shutoff. Find it now — at the meter box by the street or the house-side valve — and make sure you can actually turn it. If the worst happens, minutes matter.

Inside

• Open cabinet doors under sinks on exterior walls (kitchen and bathrooms) so room heat reaches the pipes.
• Drip faucets served by vulnerable lines — a pencil-thin stream of both hot and cold. Moving water resists freezing, and the drip relieves pressure if ice does form. Prioritize fixtures on exterior walls and the faucet farthest from where water enters the house.
• Keep the heat on — including overnight, including if you leave town. A cold snap is not the time for an aggressive setback schedule.
• Attic water heaters and lines: if your water heater or softener loop lives in the attic, make sure nearby lines are insulated; consider leaving the attic hatch cracked during the coldest hours to borrow house heat.

During the freeze

• Keep the drips running the whole time temperatures stay below freezing — especially overnight, when the coldest hours hit.
• If a faucet slows to a trickle or stops, a line is starting to freeze. Leave the faucet open, open the cabinet, and gently warm the suspect wall or pipe with a hair dryer or space heater at a safe distance. Never use an open flame on a pipe.
• If you lose water entirely, leave faucets slightly open and be ready for the thaw — that's when splits reveal themselves.

After the thaw: the part everyone forgets

As temperatures climb back above freezing, walk the house. Listen for hissing, look at ceilings below attic lines, check under sinks, and glance at your water meter with everything off — if it's moving, something is leaking. Check the water heater's relief line and any outdoor equipment too.

If you find a burst: shut off the main first, then open the lowest faucet in the house to drain pressure, and call us. Water damage compounds by the minute; the shutoff is always step one.

Worth doing once, before next winter

A one-time hardening pays off every cold snap after: permanent insulation on attic and exterior-wall runs, freeze-resistant exterior faucets, an accessible and labeled main shutoff (or a smart shutoff valve that closes automatically when a leak is detected), and pool equipment freeze protection verified. If your home flooded or came close in a past freeze, a short walkthrough with a plumber will identify exactly which lines put you at risk — it's a modest visit that can prevent a five-figure January.

Houston will always be a city that meets winter unprepared — but your house doesn't have to be.