Heave in a house refers to the upward movement of the ground supporting the foundation, often caused by soil expansion due to moisture changes. This can lead to structural issues in a house. Whether you should be worried depends on the severity of the heave and its impact on your property. Here are some factors to consider and steps to take:

Factors to Consider:

1. Severity of Heave:
   • Minor: Small cracks in walls or slight unevenness in floors might indicate minor heave.
   • Severe: Large cracks, sticking doors/windows, or significant floor unevenness can indicate severe heave and potential structural damage.
2. Duration:
   • Temporary: Sometimes, heave is seasonal and may stabilize when moisture levels return to normal.
   • Persistent: Ongoing heave can indicate a more serious problem that needs addressing.
3. Location and Soil Type:
   • Clay Soils: Clay-rich soils are prone to expansion and contraction with moisture changes.
   • Tree Roots: Tree roots can absorb moisture from the soil, causing heave when the tree is removed or dies.

Steps to Take:

1. Observation and Documentation:
   • Monitor the affected areas and document changes over time. Note any new cracks or worsening of existing ones.
2. Professional Assessment:
   • Structural Engineer: Hire a structural engineer to assess the extent of the damage and recommend solutions.
   • Geotechnical Engineer: They can analyze soil conditions and provide insights into the causes of heave.
3. Repair and Mitigation:
   • Foundation Repairs: Depending on the severity, this could involve underpinning or installing heave protection measures.
   • Drainage Improvements: Ensure proper drainage around your property to manage moisture levels in the soil.
   • Soil Stabilization: Techniques like soil replacement or chemical stabilization can reduce the risk of further heave.
4. Preventive Measures:
   • Landscaping: Avoid planting trees and large shrubs too close to the house. Ensure adequate ground cover to reduce moisture fluctuations.
   • Moisture Control: Install and maintain gutters, downspouts, and drainage systems to direct water away from the foundation.

When to Be Concerned:

• Rapid Onset: If changes occur quickly and dramatically, it could indicate a severe problem that needs immediate attention.
• Widespread Cracking: Large, widespread cracks in walls, floors, or foundations are a serious concern.
• Functional Issues: Doors and windows that no longer open or close properly can indicate significant structural movement.

Conclusion:

While heave can be a serious issue, the level of concern should be based on the specific circumstances and observed damage. Consulting with professionals will provide a clear understanding of the situation and the necessary steps to address it. If heave is minor and manageable with preventive measures, it might not be a major concern, but severe or persistent heave requires prompt attention to avoid long-term damage.