Major summer rain events can wash out pavement bases, undermine edges, and pump water into joints — without obvious surface signs. Properties that walk and document within 24-48 hours of a storm catch problems while they are still cheap to fix.
What undermining looks like
- Hollow sound when tapped with a hard object.
- Slight depression along curb lines or near catch basins.
- Cracks that have shifted vertically since the last inspection.
- Soil or fines visible on the pavement surface after runoff.
- Edges that flex under foot pressure.
Where to inspect first
- Catch basin rings and trench-drain edges.
- Curb and gutter joints.
- Loading dock and dumpster pads.
- Low spots that ponded during the storm.
- Asphalt-to-concrete transitions at sidewalks and ramps.
Quick triage tests
- Tap test: hollow sound = void underneath.
- Probe test: insert a screwdriver into a crack; if it goes in easily and pulls out wet, water is in the base.
- Edge press: walk the edges; flex = undermining.
- Stake test: drive a small stake into ponded areas; if it sinks easily, subgrade is saturated.
Want this assessed on your property?
Free written pavement findings from the crew that does the work.
What to do in the first 72 hours
- Photograph everything with timestamps and a measuring tape.
- Cone or barricade hollow or depressed areas.
- Clear catch basin grates immediately.
- Schedule a professional condition assessment within 7 days.
- Avoid layering temporary patches — they hide the diagnosis.
2026 Commercial Pavement Budget Planner
A contractor-built worksheet for budgeting parking lot and roadway work: cost ranges by scope, a condition-scoring sheet, phasing guidance, a bid-comparison checklist, and the questions to ask before you sign.
Common questions
How fast can undermined pavement collapse?+
From days to weeks under truck loading; longer under light traffic. Either way, the longer it sits, the larger the repair becomes.
Will sealcoating fix water-damaged pavement?+
No. Sealcoating over a failing base is wasted money and can mask the problem long enough to require a much larger repair.
Is this our insurance company's problem?+
Depends on policy. Document immediately either way — insurers respond to timestamps.
Avello provides free commercial pavement assessments across the Hudson Valley. No obligation — you keep the documentation either way.