How Do Flood Waters Damage a Home's Foundation?

When flood waters saturate the ground around your home, the water pushes against the foundation walls from the outside. This pressure, called hydrostatic pressure, can be immense. It forces moisture through small cracks and pores in the concrete or masonry.

As the water level rises, the pressure increases. It can cause walls to bow inward or crack. In severe cases, the foundation may shift or even lift. The longer the water stays, the more damage it can do.

Water seeping into concrete can cause it to deteriorate over time. Freezing and thawing cycles, common in wet winters, make cracks worse. The surface can flake or peel, a condition called spalling. This weakens the foundation's outer layer.

Cracks can start small but widen as water keeps penetrating. Even hairline cracks allow moisture in. Over the years, they can grow into structural problems. Inspecting your foundation after a flood helps you catch these issues early.

• Look for horizontal cracks, which often signal pressure from outside
• Check for vertical cracks that may indicate settling
• Notice any bowing or leaning in the walls
• Feel for dampness or efflorescence, a white powdery residue
• Watch for uneven floors or gaps around doors and windows

After flood waters recede, act quickly to reduce further damage. Remove standing water and wet materials if it is safe to do so. Ventilate the area to help it dry. Document the damage with photos and notes for your insurance claim.

Consider hiring local water damage pros to inspect the foundation and assess structural issues. They can identify hidden damage and guide you on repairs. If you live in Bellingham, keep your shutoff valve location written down for future emergencies.

• Remove soaked carpets and padding
• Use fans and dehumidifiers to dry the area
• Open windows when weather permits
• Dispose of porous materials that cannot be cleaned
• Keep a record of all damage and actions you take