How to How to Identify Foundation Cracks
Foundation cracks range from harmless to serious structural issues. Learn to identify crack types, measure progression, and determine when professional evaluation is needed.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Inspect All Foundation Areas
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 1: Inspect All Foundation Areas
Check interior basement walls, exterior foundation, and crawlspace. Look for both vertical and horizontal cracks, as well as stair-step patterns in block.
2 Step 2: Measure Crack Width
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 2: Measure Crack Width
Use crack width ruler or coin for comparison. Hairline cracks under 1/16" are usually minor. Cracks wider than 1/4" require professional assessment.
3 Step 3: Identify Crack Patterns
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 3: Identify Crack Patterns
Vertical cracks are often settling. Horizontal cracks indicate pressure and are serious. Stair-step cracks in block walls suggest foundation movement.
4 Step 4: Check for Active Movement
Step 4: Check for Active Movement
Mark crack ends with pencil and date. Photograph. Measure width. Re-check in 30-60 days to determine if crack is growing.
5 Step 5: Look for Additional Signs
Step 5: Look for Additional Signs
Check for doors/windows that stick, uneven floors, gaps between walls and ceiling/floor, or separation between walls and chimney.
6 Step 6: Get Professional Foundation Inspection
Step 6: Get Professional Foundation Inspection
For cracks wider than 1/4", horizontal cracks, rapid growth, or multiple signs of settlement, hire structural engineer or foundation specialist.