What are the advantages and disadvantages of internal insulation wall?

Advantages of internal thermal insulation wall:

The so-called external wall internal insulation means adding insulation layer inside the external wall structure. Its construction speed is fast and its technology is mature.

Disadvantages:

First of all, the insulation layer is made inside the wall, which reduces the use area of commercial housing; Secondly, it affects the secondary decoration of residents. Heavy objects such as decorative paintings cannot be hung on indoor walls, and hanging fixed objects on internal walls is easy to damage the internal insulation structure. Third, the inner wall is prone to mildew and other phenomena; The internal thermal insulation structure will lead to two temperature fields in the internal and external walls, resulting in temperature difference. The phenomenon of thermal expansion and contraction of external wall is greater than that of internal wall, which will cause instability of building structure and cracking of insulation layer. ?

Advantages of external thermal insulation wall:

As the name implies, external insulation of external wall is a kind of insulation method that puts the insulation layer outside the main wall material, which is equivalent to adding protective clothing to the whole building. It is a kind of insulation method strongly advocated by the state at present.

Because the thermal insulation material is placed on the outside of the external wall of the building, the influence of cold and hot bridges in various parts of the building can be basically eliminated; Can give full play to the heat preservation efficiency, and under the condition of using the same heat preservation material, the thickness of the required heat preservation material is smaller, which is more energy-saving.

The external thermal insulation of the external wall improves the thermal insulation performance of the wall and increases the indoor thermal stability. It also prevents the external wall from being soaked by wind, frost, rain and snow to a certain extent, improves the moisture-proof performance inside the wall, and avoids indoor mildew, dew condensation, cold penetration and other phenomena. Because the thermal insulation material is laid on the outside of the wall, the indoor environment pollution caused by volatile harmful substances in the thermal insulation material is avoided. ?

The insulation layer placed outside the building greatly reduces the influence of natural temperature, humidity and ultraviolet rays on the main structure, which can protect the main structure and prolong the life of the building. Due to the influence of temperature on the structure, the expansion and contraction of the building periphery may lead to the cracking of some non-structural components of the building. External thermal insulation technology can reduce the stress caused by temperature in the structure.

External thermal insulation of building exterior wall is not only suitable for buildings that need heating in winter in the north, but also suitable for air-conditioned buildings that need thermal insulation in summer in the south. It is not only suitable for masonry external wall insulation of brick-concrete buildings, but also suitable for concrete external wall insulation of shear wall structures. Both new and old houses are suitable.

Disadvantages:

If the external wall is insulated, there will be a fire later. In severe cases, a building will be burned down, but the internal insulation of the external wall will not; Moreover, the insulation layer is very fragile, and it is easy to fall off when it is exposed to wind and rain, and it will be more troublesome to repair it later. Moreover, the added exterior wall color will be different from the previous exterior wall color, which will have an impact on the appearance.

Extended data:

External wall thermal insulation technology can be summarized into two categories: single material external wall and composite external wall.

Single material, that is, using a single product with good thermal insulation performance as the wall material, meets the requirements of energy-saving standards. Such as aerated concrete blocks and ALC aerated concrete slabs.

Composite wall, that is, composite insulation material on the structural wall. According to the synthesis method, it can be divided into three types:

(1) Internal insulation method: stick insulation board or polystyrene particle rubber powder on the inside of external wall. However, the practice of internal insulation will form a "thermal bridge" at the junction of internal and external walls, ring beams and other parts, and condensation will occur. Once there is a problem, the maintenance will have a great impact on the residents.

(2) Sandwich insulation method: put insulation materials (polystyrene, rock wool, polyurethane, etc.). ) form a sandwich wall in the middle of the wall.

(3) External wall insulation, adding insulation measures on the outside of the wall. Stick polystyrene board or spray polyurethane on site. External wall thermal insulation system is a widely used technology, which has high thermal efficiency, does not occupy indoor space, is conducive to protecting the main structure, can prolong the service life of the house, and is suitable for energy-saving renovation of existing houses.

References:

Baidu encyclopedia? External thermal insulation system of external wall

References:

Baidu encyclopedia? External wall internal thermal insulation system