Understanding Cracking Categories in External and Internal Walls
Cracks in walls are common and can vary significantly in severity. Recognising the type of crack and its underlying cause is essential for accurate diagnosis and repair. Below we will explain the types of wall cracking, and the corresponding categories to help you identify the severity of your wall cracking at home.
Wall Cracking Categories
Category 0: Hairline Cracks
These cracks are less than 0.1mm wide, barely noticeable, and generally not a cause for concern.Category 1: Fine Cracks
Cracks under 1.0mm that are visible but minor, requiring no repairs.Category 2: Noticeable Cracks
Measuring between 1.0mm and 5.0mm, these cracks can be easily filled and repaired without major work.Category 3: Moderate Cracks
Cracks from 5.0mm to 15.0mm that may need professional repair. This might involve replacing sections of the wall and could compromise weatherproofing.Category 4: Severe Cracks
Cracks over 15.0mm, indicating significant structural damage that demands extensive repair work. This can affect the wall's stability and load-bearing capacity.
Common Causes of Wall Cracks
Cracking can be attributed to several factors, including:
Tree Proximity: Roots can shift and disrupt the soil under a building, impacting its foundation.
Soil Moisture Fluctuations: Changes in soil moisture content can cause it to expand and contract, creating stress on the structure.
Poor Drainage: Inadequate drainage can lead to water pooling around the foundation, weakening the walls.
Uneven Settlement: If a building settles unevenly, it places excessive stress on its walls, leading to cracks.
Reactive Soils: Certain soils expand and contract with moisture changes, affecting structural stability.
Original Design Flaws: Structural or design issues can contribute to cracking over time.
Solutions for Cracking Beyond Category 3
Underpinning
A foundational repair method to strengthen and stabilize the base of a structure. This approach involves reinforcing the foundation to support its load and prevent further movement.Demolition and Rebuilding
In cases of significant damage, sections of the wall may need to be demolished and reconstructed with added design elements to prevent future issues.Urethane Injections
A less disruptive method where polyurethane resin is injected into voids or weak soil beneath the wall to provide support and stabilise the structure.
Monitoring and Prevention Tips
Identifying the source and severity of wall cracks is essential to prevent worsening conditions. Routine inspections and proactive steps, such as improving drainage and soil management, can help maintain the stability of a property.
For Adelaide homeowners, scheduling professional residential building inspections can detect early signs of wall cracking and recommend targeted solutions, protecting your investment and ensuring long-term peace of mind.
Continue Reading