Void Filling as a Planned Maintenance Strategy
Water is responsible for most void formation beneath concrete slabs in New Jersey. Stormwater infiltrating along the perimeter edge of a slab carries fine soil particles with it as it flows beneath the concrete, progressively eroding a larger unsupported zone with each significant rain event. Clay-dominant soil profiles, which are common in northern and central New Jersey, contribute a seasonal void mechanism independent of water flow: clay shrinks substantially in dry summer conditions, opening gaps beneath slabs that later partially refill when the soil rehydrates in fall but never fully recover their original density.Utility trench backfill represents a second void source specific to developed properties.
