Threshold markers:

• Water level is 4-7 feet against the outside of the building
• Limited scouring at the footings
• Soils are saturated and unstable
• Cracks noted on or along the foundation walls
• Significant undermining of the concrete slab -- significant cracking is visible

Common damage:

• Floodwaters extend over the top of the foundation system
• Significant inundation for over 12 hours
• Some cracking of the masonry/concrete foundation walls (not existing cracks that occurred during the curing stage)
• Some damage to the foundation wall from debris or settlement noted

Foundation damage between 50% and 75% will be identified in cases where the foundation may initially appear intact, but there are significant structural issues that make the foundation unstable. Insurance claims data can provide specific information and may indicate substantial damage.

The photo shows a case where the home’s foundation appeared to support the rest of the structure. However, upon closer examination, major cracks can be seen and signs that the foundation had shifted due to wave action and storm surge.