Burst pipe: what to do in a Baytown freeze

Copper and PEX don’t fail the same way in a hard freeze. Which one runs through your walls often comes down to when the house was built. Knowing which one you likely have won’t stop a freeze, but it changes what to watch for.

What a hard freeze does to copper

Copper is a rigid metal pipe, and rigid materials don’t have much give. Water expands by close to a tenth of its volume as it turns to ice, and copper has nowhere to send that extra volume, so the pipe wall splits instead. The crack usually opens along a straight seam, often at a joint or a bend where the metal was already under some stress.

What PEX tolerates that copper can’t

PEX is a flexible plastic tubing, and flexible materials can absorb some of that expansion instead of fighting it outright. That doesn’t make PEX freeze-proof. A hard enough freeze, held long enough, can still split a PEX line, especially at a rigid fitting or connector where the flexibility runs out. It just takes more cold, for longer, to get there.

Which one your house is more likely to have

Copper dominated Texas home plumbing for decades, roughly the 1960s through the 1980s. PEX became the standard well before most homes built in the 2010s and 2020s went up. Baytown’s oldest downtown-core homes, some dating to the 1940s, can predate the copper era altogether, which sometimes means older galvanized steel lines instead. There’s no way to know which pipe runs behind a specific wall without a plumber’s own look. Age is a clue, not a guarantee.

The break happens at the freeze, the flood waits for the thaw

A pipe often cracks at the coldest point of the freeze, right where the ice plug forms. Nothing floods yet, because that same ice plug is blocking the crack from the inside. Once temperatures climb and the ice melts, water finds that crack and finally has somewhere to go. That’s why a house can go through an entire hard freeze looking fine, then flood hours later once the sun comes out. That delay catches people off guard every single time.

Why a slow drip actually helps

A faucet left open just enough to drip does two real things. It keeps pressure from building up behind whatever ice does form, and it gives water somewhere to go besides trapped between two blockages. It won’t stop a determined freeze from forming ice at all, but it lowers the odds of a full, sealed plug that turns into a split pipe.

A space heater near a thawing pipe or standing water is a shock and fire risk, not a fix. Keep the two apart.

Texas’s hardest recent freeze set the bar

The freeze that hit Texas in February 2021 still comes up first when plumbers talk about a bad week. Burst pipes drove one of the largest insurance-claim events in the state’s history that year. It’s proof this isn’t a once-in-a-lifetime risk confined to the far north. It happens here, in houses designed around Gulf Coast summers, not northern winters. Both older copper lines and newer PEX runs failed that week, in numbers big enough that pipe material alone wasn’t the deciding factor. How exposed a line was to the cold mattered more than what it was made of.

Once a line actually splits, the shutoff-and-cleanup steps live on the burst pipe cleanup page, which takes on the specifics of stopping the water and drying out what it reached. The general order of steps beyond a single burst pipe is the subject of the what to do after water damage guide. Whether a burst pipe counts as sudden, accidental damage or something else is exactly the question the homeowners insurance guide pins down.

The thaw is the flood

The freeze does the breaking. The thaw does the flooding. That gap in between is where everything useful happens. It’s when a slow drip helps, when a shutoff valve matters, and when calling ahead beats discovering the mess after it’s already spreading.