1. the heat preservation plate deformation

Causes of cracks and countermeasures

Many construction units to reduce wet work.Use of prefabricated insulation board.The precast heat preservation board is formed in the factory and only needs to be pasted on site, which facilitates the construction.But this kind of stick board method is in construction 2 3 months to after a year, most face layer appeared the craze of different level, board juncture place is particularly apparent.The reason is that the external wall structure is exposed to the atmosphere and affected by the temperature difference. The overall shape size of the structure also changes, and each thermal insulation board attached to the external wall shrinks and expands separately.The wall deformation is large, the heat preservation board deformation is small, resulting in the wall and heat preservation board body shape change of the stress direction and size is different, the change of each part with the rise and fall of temperature and reincarnation.Internal insulation plates are attached to an unstable foundation, and under normal circumstances, it is only a matter of time before cracks appear in the plates.The countermeasure to this kind of crack is that the elastic soft joint material should be considered.

2. The insulation material becomes soft in damp

Causes of cracks and countermeasures

In order to avoid cracking of the board joint many people choose the thermal insulation method of slurry type on-site plastering.To get the whole insulation layer.Although this insulation layer has achieved good integrity, no crack effect.But the plastering paste can not be set up as the air layer as the plate.Can not effectively control the wall condensation, insulation in a humid state.The phenomenon of wall condensation caused by temperature difference between inside and outside often happens.If the room temperature is 20 ℃.Under the condition of 70% relative humidity, dew point of 14 ℃, which is the wall temperature below 14 ℃ metope can appear condensation.If the insulation material does not have good steam permeability.The absorption of water by the insulation layer will further increase the thermal conductivity and intensify the condensation phenomenon.Generally speaking, materials with a bonding strength of more than 50% and a softening coefficient of less than 0.5 should be avoided on the structural wall for 48h.

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