Poor soil conditions, poor compaction, tree roots and poor drainage all impact the integrity of the soil under a concrete slab.
- Poor Soil Conditions – Clay-rich soils are elastic. They expand and contract with moisture content. As soils become saturated with water, the clay expands and loses strength. This condition allows slabs to sink just like standing in wet mud. This can occur from heat rans, melting snow or plumbing leaks.
- Poor Compaction – Many homes are built on backfilled soils. If the soil is not compacted correctly, backfill will slowly and evenly compact. Sometimes this can happen over a period of a year, allowing slabs to settle.
- Tree Roots – Trees and large shrubs can consume up to 30 gallons of water a day. If located near concrete, the loss of water in the soil will make the soil contract and can cause the slabs to settle.
- Poor Drainage – Improper drainage can cause soil instability by creating areas of saturated soils allowing the slabs to settle. Poor drainage can be typical to the area or as minor as a misplaced down spout.
Common Problem Areas
- Interior Floor Slabs
- Porches and Stoops
- Pool Decks and Patios