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External wall insulation materials play a crucial role in building energy efficiency, and their insulation requirements are multifaceted.

Firstly, the thermal conductivity is low. Thermal conductivity is a key indicator for measuring the performance of insulation materials, and the lower the thermal conductivity, the better the insulation performance of the material. For example, polystyrene foam board, extruded polystyrene foam board and other common thermal insulation materials usually have low thermal conductivity, which can effectively prevent the transfer of heat, reduce the exchange of indoor and outdoor heat, thus reducing the energy consumption of buildings and maintaining a relatively stable indoor temperature environment. Whether in cold winter or hot summer, they can provide people with a comfortable living and use experience.

Secondly, the thickness of the insulation material should be appropriate. The thickness of insulation material directly affects its insulation effect. Generally speaking, the thicker the thickness, the better the insulation performance. But the thickness cannot be infinitely increased, and factors such as the actual situation and cost of the building need to be comprehensively considered. Different thermal insulation materials have different standard thickness ranges. For example, in the external wall thermal insulation system, the thickness of polystyrene foam board generally ranges from 30mm to 100mm. The specific thickness should be determined according to the energy saving requirements of the building and the climate conditions of the region.

Furthermore, the durability of insulation materials is good. External wall insulation materials are exposed to natural environments for a long time and need to withstand various factors such as wind, sun, rain, and temperature changes. Therefore, it is required that insulation materials have good durability and maintain their insulation performance and physical and chemical properties unchanged over a long period of time. For example, some inorganic insulation materials such as rock wool have good durability and are not easily affected by external factors such as aging and deterioration.

In addition, insulation materials should also have certain fire resistance and environmental performance. The fire resistance performance can ensure the fire safety of buildings, while the environmental performance meets the sustainable development requirements of modern buildings.

In short, the insulation requirements for exterior wall insulation materials cover multiple aspects such as thermal conductivity, thickness, durability, fire resistance, and environmental performance. Only by meeting these requirements can the insulation effect of insulation materials be truly exerted and contribute to building energy conservation.