Ask any seasoned Southern California plumber, and they will tell you that roughly 80% of all residential slab leaks occur on the hot water distribution side rather than cold supply lines. Why are hot water pipes so vulnerable?
Thermal Expansion and Sub-Slab Friction
Copper is a ductile metal that expands when heated and contracts when cooled. Every time your water heater fires and delivers 120°F–140°F water to your shower or dishwasher, the buried copper pipe lengthens by a fraction of an inch. When the water cools, it contracts.
In older Rialto homes, builders frequently laid copper tubing directly into coarse aggregate without protective foam sleeving. Over 15 to 30 years, thousands of expansion cycles rub the exterior copper wall against abrasive concrete until a pinhole develops.
Accelerated Hard Water Chemical Corrosion
Hot water accelerates electro-chemical corrosion. Mineral salts (calcium carbonate and chlorides) precipitate out of solution faster in hot water, causing aggressive pitting on pipe interiors. If you have hot spots on your floor, contact our team immediately.