Soft Zones and Organic Matter in Subgrade
Soft Zones and Organic Matter in Subgrade is a high-severity soil & foundation defect SURE inspectors have documented across 1 inspection report.
Causes
- Presence of natural organic matter or loose soil conditions
- Inadequate site preparation
Symptoms to look for
- Potential for differential settlement of the structure
- Reduced bearing capacity of the ground
- Structural instability
Remedies
- Replace removed material with approved granular filling compacted to 98% Standard Maximum Dry Density (SMDD)
- Proof roll fill subgrade and remove any soft zones or deleterious material
- Strip topsoil to a minimum depth of 150mm
Get an inspector through this property.
Findings in this category skew high severity. If you are under contract, we can usually book inside the cooling-off window. Every inspection includes 12 months of free advice.
Curated entries in Soil & foundation
- Curated 1–4/5Trees in Close Proximity to Dwelling
Large trees within the foraging radius of the dwelling - typically any tree within 3 m for small species, or within 10 m for large eucalypts - introduce two distinct risks: root-driven soil moisture fluctuation that causes differential footing movement on reactive clay, and a direct termite foraging corridor between a timber food source in the crown or root system and the building structure. Neither defect is always present, but the proximity constitutes a conducive condition that warrants ongoing monitoring.
- Curated 2–5/5Reactive Clay Soil Movement Affecting Foundation
Seasonal expansion and contraction of reactive clay soils causing cyclical foundation movement, wall cracking, and floor level changes. Prevalent in Sydney Western Suburbs and some Perth clay zones. Severity depends on soil class (H, H1, H2, E) and footing design adequacy.