1. Surface Treatment. The surface of standard extruded polystyrene boards is smooth, which can lead to poor adhesion between the board and the adhesive or plaster. To address this, a peeling treatment is applied, creating a more uniform and effective bonding surface. This improves the tensile bond strength, water resistance, and freeze-thaw resistance of the system, both exceeding 0.25 MPa. As a result, the overall adhesion and reliability of the insulation system are significantly enhanced. Additionally, the peeling process helps release internal stresses uniformly, reducing potential deformation issues over time.
2. National Standards. Currently, there is no specific national standard for the use of extruded polystyrene boards in construction. As a result, many applications have relied on standards originally designed for expanded polystyrene (EPS) boards. However, progress has been made in recent years. In June 2009, the Shanghai Academy of Sciences and the National Building Standard Design Institute jointly developed technical specifications for the external thermal insulation system using extruded boards. Around the same time, the national standard 08CJ16, titled "Extrusion Plate Insulation System Building Structure," was revised by Knauf Company through the National Building Standard Design Institute. These efforts reflect the growing need to establish clear application guidelines and improve the performance and safety of extruded boards in exterior insulation systems.
The national standard specifies that the dimensional stability of peeled extruded boards should be ≤2.0%. Knauf has conducted research in this area, proposing the installation of expansion joints in key areas of the external insulation system. This allows the system to effectively manage and release stress caused by temperature changes, helping to prevent cracking and other structural issues.
3. Dimensional Stability. It's commonly believed that extruded boards are not ideal for exterior insulation due to their poor dimensional stability, which could cause size changes under weather conditions and potentially lead to cracks in the finish layer. However, when comparing the elastic modulus of the materials used in the system—mortar at around 15,500 MPa, EPS at 4–6 MPa, and XPS at 7–9 MPa—it becomes clear that both EPS and XPS are within the same order of magnitude as the mortar. This means that the constraint effect from the surrounding materials remains similar, and there's no significant difference in how they interact with the mortar. Many real-world projects have confirmed that EPS and XPS perform comparably in terms of crack resistance and long-term stability.
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