In the actual application process of the external walls internal insulation system. There are also some shortcomings that are widely criticized by everyone. For example: condensation (condensed water on the inner surface), mildew problems. Almost as soon as internal insulation is mentioned, everyone subconsciously thinks of the above two keywords.
But is this problem really inevitable or unsolvable for internal insulation systems? of course not. First of all, we need to make it clear that it is not the internal insulation that will cause condensation on the wall surface. The necessary condition for condensation on the wall surface is that the minimum temperature of the wall surface must be less than or equal to the dew point temperature.
(The dew point temperature refers to the temperature at which the air is cooled to saturation under the condition that the water vapor content and the air pressure do not change. Figuratively speaking, the temperature when the water vapor in the air turns into dew is called the dew point temperature).
Causes of Condensation
The main cause of surface condensation in a heated room with normal humidity is that the inner surface temperature of the envelope is lower than the dew point temperature of the room air. Therefore, avoid condensation on the inner surfaces. The thermal resistance of the cold and heat bridge of the outer enclosure must be improved. The heat and cold bridge parts need to be designed for thermal insulation inside the building. Its insulation layer thickness and extension width.
Therefore, the thermal bridges at the corners of the exterior walls do not require special treatment. Thermal bridges can be eliminated by wrapping a certain thickness of thermal insulation material at the junction of the outer wall, inner wall, and floor slab. Otherwise there is a risk of condensation.
There are mature solutions to the surface condensation problem of building insulation. The real problem with internal insulation systems is condensation inside the system. Internal condensation is when water vapor passes through the outer enclosure. When maintaining the structure and insulation material interface at or below the dew point temperature. Water vapor forms condensed water.
Therefore, it is recommended to check the internal condensation according to the actual situation for the internal insulation project. In case of risk of internal condensation. Moisture-proof and steam-proof measures should be taken at the interface where condensation occurs.
For internal insulation systems in rooms with normal humidity. It is recommended to use insulation with relatively good water vapor permeability to reduce the risk of condensation inside the system. Rather than blindly insulate the steam. Pay more attention to moisture permeability.
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