Insulation practices for exterior walls

Inner exterior wall insulation refers to adding insulation construction measures to the inside of the building’s exterior wall. Internal exterior wall insulation is one of the commonly used exterior wall insulation methods in my country.

Advantages of internal insulation in exterior walls
Internal insulation in exterior walls does not have high requirements on the performance of insulation materials and supporting technology, and it is easy to construct and the cost is relatively low.

Disadvantages of internal insulation in exterior walls
In areas with relatively high humidity in hot summers and cold winters, the insulation layer of exterior walls is prone to moisture and reduces thermal insulation performance. Compared with the external wall insulation method, the construction is more complicated, mainly because it is difficult to achieve good insulation for thermal bridges on the walls such as doors, window lintels, ring beams, reinforced concrete columns, structural columns, and floor slabs supported on the wall. deal with. If the exterior wall is thermally insulated, condensation will often appear in these parts during cold winters, especially when the humidity is high. Not only will the insulation materials near this part become damp, but the damp parts will gradually expand, and the area of ​​condensation will also become larger. It gets bigger and bigger, and even mold and blackening appear in the damp areas. In addition, if secondary decoration is to be carried out, the original insulation layer will often be destroyed, which will reduce the insulation and energy-saving effect. The use of internal insulation in exterior walls will cause the main structure of the building to be directly exposed to an environment with large temperature changes and large changes in dryness and humidity. The wall will deform greatly, and the deformation stress will have a great impact on the wall structure, and it is more likely to cause cracks in the wall or insulation layer. There are also exterior walls with internal insulation. It is more difficult to hang or fix objects on the inside of the exterior wall, and it will damage the insulation layer.

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