This paper deals with the theoretical conditions necessary for the formation of stable mechanical insulation foam. In addition to this it gives concrete proposals for the formation of mechanical foam and its application to surfaces in the field of civil engineering. Mechanical foam is formed relatively easily, provided suitable conditions are present. The insulating character is provided by finely distributed air bubbles in the insulation layer Similar characteristics can be found in various products made of foamed concrete as well as foamed polystyrene, which are not manufactured on site but in manufacturing plants. The main objective is the formation of a porous mechanical foam on the construction site and its application onto construction elements. The foam must be stable enough to be applied to the construction surface and then solidify.