Windows Fixed: Cracks Under

| Crack Width | Type | Likely Cause | Concern Level | |-------------|------|--------------|----------------| | < 1/16 inch (hairline) | Vertical or diagonal | Drywall shrinkage, minor seasonal movement | Low – cosmetic | | 1/16 – 1/8 inch | Diagonal, one side only | Moderate foundation settlement or framing deflection | Moderate – monitor | | 1/8 – 1/4 inch | Stepped in masonry, widening over time | Active foundation movement, expansive soil | High – engineer evaluation | | > 1/4 inch | Accompanied by sticking doors/windows | Significant structural settlement | Severe – immediate assessment |

Final note: If you live in a region with expansive clay soils (common in Texas, Colorado, and parts of the Midwest) or in a coastal area with compressible soils, periodic foundation checks and maintaining consistent soil moisture around the perimeter are as important as any crack repair. cracks under windows