As a building inspector in Perth, you know that settlement cracks in walls can be a common issue in both new and old homes. These cracks can be unsightly and may cause concern for homeowners. Fortunately, settlement cracks can be fixed, and there are Australian Standards in place to guide the repair process. In this blog post, we will explore what settlement cracks are, how they occur, and how they can be repaired in accordance with Australian Standards.

What are Settlement Cracks?

Settlement cracks are cracks that appear in the walls of a building due to the settling of the foundation or ground below. These cracks typically appear as vertical cracks in the corners of doors and windows and along the length of walls. Settlement cracks can also appear as diagonal cracks that start at the corners of windows and doors and extend outward.

What causes settlement cracks in walls?

Settlement cracks occur when the ground beneath a building shifts or settles. This can happen due to several factors, including:

• Poor soil compaction during construction: If the soil beneath a building was not properly compacted during construction, it can cause settling over time, leading to settlement cracks.

• Natural settling of the building: As a building ages, it may naturally settle due to factors such as changes in temperature or moisture levels.

• Soil movement: Soil movement can occur due to changes in moisture content, such as during droughts or heavy rainfalls, as well as due to soil erosion or landslides.

• Some of the settlement can occur and be considered to be a major settlement crack if the downpipe has been damaged and causing seepage next to the footings.

• Some settlement cracks occur if there is massive construction work and heavy construction machinery such as road compactor, water tank, & road grader moving in the area, which can cause the soil underneath to move, causing settlement cracks in the homes.

Is settlement cracks a sign of a serious problem?

Settlement cracks can be a sign of a serious problem if they are wider than 5 mm or if they show signs of movement. Signs of movement can include cracks that are wider at the top than at the bottom, or cracks that have shifted out of alignment with the rest of the wall. In such cases, it is recommended to consult with a professional, such as a licensed building inspector, to assess the severity of the crack and determine if any further Structural Engineer investigation or repairs are necessary.

Can settlement cracks be repaired?

Settlement cracks can be repaired using various methods, depending on the severity of the crack. For smaller cracks, a flexible filler, such as a polyurethane-based filler, can be used. For larger or more severe cracks, a process called crack stitching may be necessary. This involves drilling into the wall and inserting steel rods or wires to reinforce the crack. In all cases, it is recommended to consult with a professional to assess the severity of the crack and determine the best course of action. 

Will settlement cracks reappear after being repaired?

If the underlying issue that caused the settlement crack has not been addressed, the crack may reappear after being repaired. This is why it is important to consult with a professional to assess the severity of the crack and determine the best course of action to address the underlying issue. 

How can settlement cracks be prevented?

Proper construction techniques, including soil compaction test prior to pour the concrete and appropriate foundation design, can help prevent settlement cracks. Additionally, regular maintenance and monitoring of a building's foundation and structure can help identify and address potential issues before they become more severe. It is also important to ensure proper drainage around the building to prevent excess moisture from affecting the soil.

The Role of a Building Inspection Service Business in Perth

A certified building inspector can play a crucial role in identifying and addressing settlement cracks. They are trained to identify potential issues with a property, including settlement cracks, and can provide valuable insights and recommendations for homeowners to maintain and improve the safety and integrity of their homes. A building inspector can also perform regular inspections to monitor the condition of the building and identify any potential issues before they become more severe. 

Conclusion

In conclusion, settlement cracks in home walls can be a concerning issue for homeowners. Understanding the causes of settlement cracks, the severity of the issue, and how they can be repaired and prevented is crucial for maintaining the safety and integrity of a building. Consulting with a professional, such as a certified building inspector, can provide valuable insights and recommendations for addressing settlement cracks and ensuring the long-term stability of a property.