Steel Mesh Improves Plaster Cracking Prevention: A Comprehensive Guide
When it comes to plaster cracking prevention, one of the critical elements is the structural integrity and proper installation of steel mesh. This article will explore how placing steel mesh before plastering affects the formation of cracks in buildings, particularly at joints between columns and walls or beams and walls. We will also discuss the importance of maintaining the mortar thickness and the use of control joints.
Introduction to Steel Mesh in Plastering
Steel mesh, also known as steel lath, has long been a preferred substrate for plastering. It serves as a bond between the finishing surfaces and helps the plaster to resist forces acting on it. Proper installation can significantly reduce the formation of cracks, but it is essential to maintain the mortar thickness.
Reduction of Cracking
By placing steel mesh before the plaster, you can indeed reduce the formation of cracks. Steel mesh helps to distribute stress and provides additional support to the plaster. This means that any stress or force acting on the plaster will be distributed more evenly, reducing the likelihood of cracking. However, it's crucial to maintain the appropriate mortar thickness during the plastering process. If the mortar is too thick, it can lead to excessive stress and increased cracking.
Control Joints: Essential for Preventing Cracking
Control joints are an age-old solution to prevent cracking in concrete applications. The same principle applies to plastering. Long stretches of plastered walls without control joints can lead to significant stress and cracking. By properly placing control joints, you can manage the distribution of stress and prevent the formation of large cracks.
To be clear, while placing steel mesh can reduce cracking, it is not a guarantee that it will completely eliminate all cracks. The saying, 'it is not whether concrete will crack but where,' is applicable to all concrete applications, and the same can be said for plastering. Control joints and proper installation of steel mesh are essential components in managing and reducing the formation of cracks.
Benefits of Steel Mesh in Plastering
1. **Bond Strengthening:** Steel mesh provides a strong bond between the plaster and the substrate. This bond helps to distribute stress more evenly, which is crucial in preventing cracking.
2. **Resistance to Forces:** By enhancing the plaster's resistance to external forces, steel mesh helps to maintain the structural integrity of the plastered surfaces. This means that any impact or expansion/contraction forces are more likely to be absorbed and distributed, rather than leading to cracking.
3. **Improved Durability:** Over time, plaster subjected to regular wear and tear may show signs of damage. With the added support provided by steel mesh, the durability of the plastered surfaces is significantly improved.
Conclusion
In conclusion, placing steel mesh before plastering can certainly contribute to the reduction of cracking, especially at joints between columns and walls or beams and walls. However, it is just one part of a comprehensive approach. Maintaining the proper mortar thickness and the strategic placement of control joints are also critical in achieving a structurally sound and aesthetically pleasing plastered surface. By combining these elements, you can ensure that your plastered surfaces remain crack-free and maintain their integrity over time.
Thank you for reading. If you have any questions about steel mesh usage in plastering or need further guidance, feel free to reach out.