Underpinning & foundation strengthening · Problem scenarios
A basement crack is getting wider
A symptom pattern can have several causes. Treat this page as a structured starting point, not a diagnosis.
Updated 2026-08-30
Short answer
Start by checking crack width and pattern and load-bearing support and stability. This scenario can have more than one cause, so choose a remedy only after the observations fit the actual construction.
Source types stay separate: technical and authority-adjacent sources support rules and risk topics, while project sources document practical experience.
1 technical/authority sourcesUpdated 2026-08-30
Start by checking
1crack width and pattern
2load-bearing support and stability
3future inspection and maintenance
4changes after rain
Possible causes to compare
A symptom pattern can have several causes. Treat this page as a structured starting point, not a diagnosis.
crack width and patternload-bearing support and stabilityfuture inspection and maintenancechanges after rain
Assessment
Underpinning & foundation strengthening
Foundation work is controlled by load paths and sequence. Existing footing depth, soil and groundwater conditions, crack patterns and the size of each working section can change what is safe to excavate or underpin.
Monitoring basement cracks. Start by documenting crack width and pattern, changes after rain and load-bearing support and stability. The purpose is to understand the building condition and constraints before choosing products, finishes or a work sequence.
Cracks in basement walls. Start by documenting crack width and pattern, load-bearing support and stability and changes after rain. The purpose is to understand the building condition and constraints before choosing products, finishes or a work sequence.
Foundation settlement around a basement. Start by documenting crack width and pattern, load-bearing support and stability and existing foundation depth. The purpose is to understand the building condition and constraints before choosing products, finishes or a work sequence.
Relevant real cases
Editorial caseUnderpinning & foundation strengtheningModerator reviewed
