On the other hand, when the insulation material is placed on the inside of walls and ceilings, it is called interior insulation. This type of insulation can be more practical if you want to maintain the appearance of the facade, or if it is difficult to access the building's exterior, such as in basements or multi-story buildings.
A commonly used interior insulation method is an insulation wall with a vapor barrier.
An insulation wall is an interior insulation solution consisting of several layers, which must be installed one by one. The insulation wall is built around a skeleton of either wood or steel and is installed without connecting to the outer wall where there is no insulation. There is a cavity in the insulation wall that is filled with a minimum of 50mm. Insulation wool, a vapor barrier, which is a plastic film that prevents moisture from penetrating the wall, then two layers of drywall of 12.5mm to 13mm each. Once the insulation wall has been installed, you can use paint or another type of coating on it.
If the building has problems with moisture or mold, this re-insulation solution with insulation walls may be problematic, as the moisture and mold will still be present behind the vapor barrier and may subsequently reappear on the walls.