Effect of waterproof and breathable aerogel outer wall insulation system on waterproof function
Aerogel exterior wall insulation systems should have good water resistance and breathability. The external thermal insulation system consists of an aerogel insulation layer and a protective layer (including the decoration system). It is a façade building system that is attached to the surface of the structural wall perpendicular to the ground. For waterproofing, the system is required to be resistant. Intrusion of external liquid water. For the gas permeability, it is required that the water vapor migration caused by the difference in pressure between the indoor and outdoor water vapors can proceed normally.
To achieve good insulation effect, the aerogel exterior wall insulation system must balance the performance of both waterproof and breathable materials.
Analysis of water absorption and gas permeability of aerogel exterior wall insulation system. The external thermal insulation system of the external wall is in order from the inside to the outside: structural layer-aerogel insulation layer-insulation protection layer-decorative layer.
The ideal system structure is set on the permeability index of various materials. From the inside to the outside, the permeability of the material is getting better and better, and the water vapor can have a smooth migration route, not to be in the wall and insulation decoration. Condensed water is formed inside the layer and analyzed from the drying process, which is also beneficial for the water to be discharged after evaporation.
The analysis of the water absorption rate is mainly to prevent the liquid water from entering the interior of the system. The surface layer material requires a lower water absorption rate than the internal material.
The aerogel outer wall insulation system solves the problem of water vapor condensation. The gas permeability index of each material of the whole system can be matched with each other. The closer to the outer side, the better the gas permeability; the more important the surface decoration is to prevent the entry of liquid water. Water resistance of the material.