Signs of a Slab Leak

Slab leaks are supply lines corroded or damaged inside or under the concrete slab. Small, silent, and expensive if ignored.

Common causes

• Copper corrosion inside a poured slab
• Shifted foundation stressing supply lines
• Electrolysis from grounding faults
• Original installation flaws

Step-by-step

1. 01Feel the floor for warm spots (hot-line slab leak)
2. 02Listen for water running when everything is off
3. 03Watch the water meter dial with all fixtures closed
4. 04Check baseboards for damp or discoloured drywall

When to call Northbridge

• Any suspected slab leak — this is not DIY
• Hairline cracks in a slab floor appearing recently
• Sudden mildew smell from carpet or laminate
• Water bill jumped with no usage change