In the field of construction, exterior wall insulation board, as a key material to improve building energy efficiency and comfort, is getting more and more attention. Its excellence is not only reflected in a single function, but also in a variety of waterproof, fireproof, thermal insulation properties in one, providing quality assurance for the building in an all-round way.
Waterproof: effective resistance to water vapor erosion
Material characteristics: Many exterior wall insulation panels are made of special materials with natural water repellant properties. For example, some of the polystyrene as raw materials of the insulation board, after special process treatment, its molecular structure is tight, water molecules are difficult to penetrate. Like the extruded polystyrene (XPS) insulation board, the interior is a closed cell honeycomb structure, which makes the water absorption of the board extremely low, usually under 1%. Even in wet and rainy areas in the south, or in high humidity environments along the coast, it can effectively prevent water from invading the wall.

Waterproof structure design: When the external wall insulation system is installed, it is usually equipped with a perfect waterproof structure. The groove splicing method is adopted between the insulation board to reduce the gap, and the special sealant is used to seal the splicing place to further enhance the waterproof effect. In addition, waterproof mortar or waterproof coil will be applied to the outer layer of the insulation board to form a solid waterproof layer. Taking a high-rise residential project as an example, after the use of external wall insulation board and combined with waterproof structure, after years of rain erosion, the indoor wall has always remained dry, there is no leakage phenomenon, effectively protecting the wall structure and interior decoration.
Fire prevention: Build a strong line of defense for building safety
Fire rating: The fire performance of external wall insulation board is divided into several grades according to different materials. Among them, the insulation board made of A-class non-combustible materials is particularly prominent, such as rock wool insulation board, foam glass insulation board, etc. The rock wool insulation board is made of natural rock as raw material, after high temperature melting, its melting point is as high as 1000 ° C or more, it will not burn in the event of fire, nor will it release toxic gases. This high-performance fireproof material is widely used in densely populated places and high-rise buildings, such as schools, hospitals, shopping malls, etc., providing a solid guarantee for building safety.
Fire prevention mechanism: When a fire occurs, the fire performance of the external wall insulation board plays a role in a variety of ways. On the one hand, the non-combustible material itself will not become the source of fire, preventing the further spread of the fire; On the other hand, part of the insulation board will expand at high temperature, forming a layer of insulation, blocking the heat transfer to the interior of the wall, delaying the damage of the wall structure, and winning valuable time for personnel evacuation and fire rescue. In an actual fire accident, the building using A class fire external wall insulation board, the wall structure remains intact in the fire, there is no large-scale collapse, effectively reducing casualties and property losses.
Heat preservation: Adjust indoor temperature to reduce energy consumption
Insulation principle: The insulation performance of the external wall insulation board is based on its unique internal microstructure. There are a large number of tiny pores inside most insulation panels, which are filled with air, and air is a poor conductor of heat. For example, the tiny pores inside the polystyrene board make the heat constantly blocked during the transfer process, greatly reducing the heat transfer efficiency. According to relevant tests, after the use of external wall insulation board, the heat transfer coefficient of the external wall of the building can be reduced to less than 0.5W/ (m² · K), and the heat loss is reduced by about 50% compared with the wall without the use of thermal insulation board.
Energy saving effect: In practical applications, the thermal insulation performance of external wall insulation board has brought significant energy saving effect. In winter, it can effectively prevent indoor heat from radiating out, keep the room warm, and reduce the energy consumption of heating equipment; In summer, the outside heat is blocked into the room, reducing the cooling load of air conditioning. According to statistics, the use of external wall insulation panels in buildings can save about 30%-50% of energy consumption per year. Taking an ordinary residential building as an example, after the installation of external wall insulation panels, the monthly energy costs are significantly reduced, and in the long run, a lot of costs are saved for the owner.
Comprehensive performance advantage
Prolong the life of the building: the waterproof performance effectively prevents the wall from freeze-thaw damage, mold and rot caused by moisture, the fire performance avoids serious damage to the wall structure by fire, and the thermal insulation performance reduces the thermal expansion and contraction of the wall caused by temperature changes, thus extending the overall service life of the building. In some old residential renovation projects, after the use of external wall insulation panels, the appearance of the building takes on a new look, the quality of the wall is significantly improved, and the life of the building is extended.
Improve living comfort: stable indoor temperature, dry living environment and good fire safety guarantee, providing residents with a more comfortable and secure living experience. Whether it is cold winter or hot summer, the indoor temperature is always maintained within the appropriate range, reducing the discomfort caused by temperature fluctuations. At the same time, the dry indoor environment is also conducive to human health, reducing the occurrence of respiratory diseases and other problems.
External wall insulation board with its excellent waterproof, fireproof, thermal insulation performance, in the field of construction to show excellent “all-round performance”. With the continuous progress of technology and the increasingly extensive application, it will play a more important role in the sustainable development of the construction industry and the improvement of people’s quality of life.