Why Do Pipes Under Slabs Crack During Freezing Winters?

Water is unique because it expands as it freezes, taking up more space than its liquid form. When this happens inside a rigid water pipe, the ice has nowhere to go. The resulting pressure builds against the pipe walls from the inside. If the pressure becomes greater than the pipe can withstand, the metal or plastic will crack open to relieve the stress.

You might notice a sudden spike in your water bill with no obvious explanation. Inside the home, you may hear the sound of running water when all taps are off or find damp, warm spots on your concrete floor. Water damage to flooring or baseboards, along with a drop in water pressure from your faucets, are other strong indicators that a pipe beneath the slab has failed.

• A sudden, unexplained increase in your water bill.
• The sound of running water when no fixtures are in use.
• Damp spots or areas on concrete floors that feel warm.
• Water seeping up at the edges of flooring or baseboards.
• Noticeably reduced water pressure from faucets and showerheads.
• Visible mold or mildew growth on walls or flooring.

Prevention focuses on keeping pipes from reaching freezing temperatures. For slab pipes, this is challenging but not impossible. Insulating exposed pipes in crawl spaces or along exterior walls helps. Letting a thin stream of cold water drip from faucets during a hard freeze can keep water moving. If you live in Long Beach, keeping your shutoff valve location written down is wise. For older homes, a professional plumbing inspection can identify vulnerable lines.

• Insulate any accessible water pipes, especially in unheated areas.
• During a freeze, let faucets drip to maintain water flow.
• Seal cracks and openings in your home's foundation and walls.
• Know the exact location of your main water shutoff valve.
• Consider a professional inspection of your plumbing system.
• Keep your home's thermostat set to a consistent temperature.