High-rise buildings often incorporate external wall insulation boards during construction to provide thermal and heat insulation, while also offering protection to the exterior walls. This helps extend the lifespan of concrete and brick materials used in the structure. However, over time, these insulation materials can degrade due to various factors. In this article, we'll explore the main reasons behind the aging of external wall insulation, which can be broadly categorized into five key areas. 1. Thermal Stress. Temperature fluctuations cause expansion and contraction of non-structural components, leading to continuous stress on the insulation layer. High-rise buildings are more susceptible to thermal stress compared to low-rise structures due to their greater exposure to temperature variations. This results in larger deformations, making it crucial to select insulation materials that follow a flexible, gradual change principle. The material's deformation capability should exceed that of the inner layers to prevent cracking and failure. 2. Wind Pressure. Wind exerts both positive (pushing) and negative (pulling) forces on high-rise buildings, which can severely damage the external insulation system. To counter this, the insulation layer must be designed with strong wind resistance. It is important to eliminate any air cavities within the insulation to prevent expansion under wind pressure, especially in negative pressure conditions, which could lead to structural damage or detachment. 3. Seismic Forces. Earthquakes can cause shearing, compression, or distortion in building structures and their insulation surfaces. The more rigid the insulation surface, the more stress it may endure, increasing the risk of damage. Therefore, high-rise insulation materials must be flexible and capable of absorbing seismic stress, reducing the load on the surface and preventing large-scale cracks, peeling, or even falling off during an earthquake. 4. Water or Steam. Moisture and water vapor can penetrate the insulation layer, leading to condensation and increased moisture content, which weakens the insulation and reduces its durability. To prevent this, it’s essential to use materials with good water repellency and vapor permeability. These properties help protect against rain erosion, freeze-thaw cycles, and internal moisture buildup, ensuring long-term performance of the insulation system. 5. Fire Resistance. Fire safety is a critical concern for high-rise buildings, as fires can spread more rapidly and be harder to control. Insulation materials must have excellent fire resistance, preventing flame propagation and minimizing the release of smoke or toxic gases. They should maintain their structural integrity and not crack, blister, or collapse during a fire, ensuring the safety of occupants and firefighters alike. Gasoline Grass Cutter,Petrol Brush Cutter Machine,Gas powered brush cutter with saw blade AWLOP CO.,LTD , https://www.awlop.com