"Serious foundation damage is common in areas where the soil is mostly clay and where most homes are built on concrete slabs. Saturated clay expands unevenly and lifts parts of a slab, causing it to crack or break. Embedded pipes can rupture, exterior walls can crack, the roof can sag."
"One of the first signs of foundation damage is that doors and windows won't open or close because their frames have become distorted by the shifting house. The glass could also twist and break."
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