Is That Foundation Crack Moving? When Crack Monitoring Makes Sense
A crack in a basement wall can be unsettling, but its appearance alone does not always reveal whether it is stable, allowing water through, or continuing to move. In Southern New Hampshire, seasonal soil moisture, snowmelt, freeze-thaw cycles, and hydrostatic pressure can all affect foundations over time.
Crack monitoring provides a practical way to document change instead of relying on memory or guesswork.
WHAT IS FOUNDATION CRACK MONITORING?
A crack monitor is a small measuring device installed across a foundation crack. Reference marks on the device make it possible to record whether the two sides of the crack move relative to each other.
The monitor does not repair or strengthen the foundation. Its purpose is to collect information. Measurements taken over time can help distinguish a crack that appears stable from one that may still be active.
WHY MONITOR A CRACK?
Monitoring may be useful when:
• A crack is newly discovered
• You are unsure whether it has widened
• Previous patches have reopened
• Doors or windows near the area have begun sticking
• Water enters through or near the crack
• You want a documented baseline before finishing the basement
• An inspection recommends watching the crack before selecting a repair
Photographs and written measurements provide a clearer record than visual memory alone.
STABLE CRACKS VERSUS ACTIVE MOVEMENT
A stable crack shows little or no measurable change during the monitoring period. Depending on its location and condition, the next step may involve water sealing, moisture control, or routine observation.
An active crack shows measurable movement. Changes in width, vertical alignment, or direction may indicate that additional evaluation is needed before a cosmetic or waterproofing repair is chosen.
Crack monitoring is only one part of an assessment. The foundation type, crack pattern, water-entry location, grading, drainage, and other conditions should also be considered.
WARNING SIGNS THAT DESERVE PROMPT ATTENTION
Schedule an inspection promptly when a crack:
• Widens noticeably or changes direction
• Reopens after being repaired
• Shows horizontal or stair-step movement
• Has displacement from one side to the other
• Leaks during rain or snowmelt
• Appears with wall bowing or other visible movement
• Is accompanied by sticking doors, uneven floors, or new gaps
Active flooding or rapidly rising basement water should be treated as an emergency.
WATER ENTRY AND FOUNDATION CRACKS
A crack can act as a direct path for water, but the visible opening is not always the entire problem. Saturated soil and hydrostatic pressure may push water against the foundation, through the wall-floor joint, or beneath the slab.
A targeted crack repair can be appropriate for an isolated leaking crack when the surrounding basement is otherwise dry. If water also appears in multiple locations, a drainage and sump-pump system may be needed to manage the larger water problem.
CAN GRADING AND DOWNSPOUTS HELP?
Yes. Soil should slope away from the home, gutters should remain clear, and downspouts should discharge far enough away that water does not immediately return to the foundation.
These improvements can reduce surface-water pressure. They do not always solve groundwater or repeated seepage, but they are an important part of a complete inspection.
HOW LONG SHOULD A CRACK BE MONITORED?
The appropriate monitoring period depends on the concern. Some cracks should be checked after heavy rain, spring snowmelt, or major temperature changes. Others may need measurements over several months to capture seasonal movement.
The important part is using consistent reference points and recording the dates and conditions with each measurement.
FOUNDATION CRACK INSPECTIONS IN SOUTHERN NEW HAMPSHIRE
Broman Basement Solutions is based in Manchester and serves homeowners across most of Southern New Hampshire. We are fully insured, offer free estimates, provide 24/7 emergency basement-water service, and offer warranties on almost all services.
Learn more about our basement waterproofing systems at https://www.bromanbs.com/basement-waterproofing.
REQUEST A FREE ESTIMATE
If you have discovered a new crack, noticed an older crack changing, or have water entering near a crack, schedule an inspection before covering the area with finished walls.
Request a free estimate at https://www.bromanbs.com/contact or call (603) 323-0312.
