The thermal conductivity of the insulation material is largely determined by the type of filling gas. If helium or hydrogen is filled in low-temperature projects, the thermal conductivity of the insulation material is considered to be equivalent to the thermal conductivity of these gases, because the thermal conductivity of helium and hydrogen is relatively large.

During the construction of external wall insulation materials, the thickness of the insulation layer meets the design requirements, the plastering surface around the corner guards, holes, and trough boxes should be neat and smooth, the plastering surface behind the pipeline should be flat, the surface should be smooth, the edges and corners should be neat, and the finished product should be well protected. The restrictions should comply with the relevant provisions of this specification. When the combustion performance of the insulation material is B1 or B2, the walls on both sides of the insulation material should be made of non-combustible materials and the thickness should not be less than 50mm.

The joints should be tight and flat, and the outer layer of the high-temperature glass wool should be laid with galvanized hexagonal wire mesh, and then pressed with self-locking gaskets. The steel plate mesh is laid at the small ash hopper at the bottom of the ash hopper, and then pressed with self-locking gaskets. Insulation materials should have good dimensional stability. If the board used in the project is prone to warping and deformation, it is easy to cause cracking and water seepage on the exterior surface. For example, extruded polystyrene board, phenolic board, polyurethane board, etc.

High strength, large shrinkage, easy to hollow and crack, the protective layer composed of plaster mortar and reinforcement mesh plays a key role in the crack resistance of the entire insulation system. The use of reinforcement mesh such as fiberglass mesh compounded in plaster mortar.