Improving adhesion between insulation and plaster in external thermal insulation systems for buildings

Abstract

The present invention relates to a method for external thermal insulation of buildings comprising (a) fixing an insulating material to the external face of the external wall of the building to be insulated, and (b) forming a primer layer by applying an adhesion primer to the external face of the insulating material, these two steps (a) and (b) being able to be carried out in any order, (c) applying a mortar coating to the primer layer, and (d) drying the mortar coating, characterized in that the primer layer comprises a cationic polyelectrolyte, an anionic polyelectrolyte and a mineral salt selected from alkali and alkaline earth metal halides and a mineral filler, and in that it has a dry basis weight of less than 200 g / m2.