How is the peeling on the wall only half a year after the renovation of the house at home?

There are generally three possibilities, that is, the thermal bridge phenomenon at the junction of cold and warm, also known as condensation, and the condensation of water vapor due to poor heat preservation. The other is not waterproof, and there is a source of leakage nearby. Third, the wall will be painted if it is not handled well, and it will regain its moisture. In fact, in three cases, the core reason is the problem of "waterproof" treatment.

Treatment means waterproofing. If it is connected to the outside, it needs to be insulated. It won't happen again.