Insulated panels with a mineral wool core combine a finished facing with insulation and allow the building to be closed quickly. Their strong point is the available fire classifications. In selected systems, acoustic insulation is also advantageous. However, greater weight and the thickness needed to achieve a low U-value must be taken into account. Assessing the advantages only makes sense when comparing panels intended for the same wall or the same roof. One panel forms the external surface, the insulation and the internal facing. On a prepared structure, this reduces the number of separate operations. It is not necessary to lay each layer of the building envelope in sequence over the entire surface. However, prior adjustment of lengths and preparation of details are of great importance.