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The heat loss of the facade is much greater than that of the basement wall, since, in addition to the latter, there is also a layer of earth, which in itself insulates. Heat loss is also more significant on the facade because both rain and wind can hit it directly, but regardless of this, the insulation of the basement wall is also decisive.
In many households, there is also a room on the basement floor where family members can stay regularly, it can even be a living room or a gym. Ensuring the ideal temperature is decisive in these types of rooms, for which good insulation is essential, and in addition, heating costs will also be lower. Waterproofing also plays an important role in protecting the basement wall from soil moisture, groundwater, and precipitation from the facade, thus reducing the chance of mold appearing.
Slab insulation also has many advantages, including the elimination of footsteps and other disturbing sounds. A basement or garage created under the house cools the house, but slab insulation is an excellent solution to eliminate this problem.
The insulation will be adequate if the insulation material is of excellent quality. Austrotherm, Rockwool, and Baumit are reliable brands, they have been on the market for a long time and the products they offer are perfectly suitable for the task.