a method for repairing and / or waterproofing and / or insulating and / or reinforcing and / or restoring the structural integrity of wall systems , which it consists in providing spaced injection holes within a wall system in a manner suitable to pass through cavities that exist in the wall system , inserting injection tubes in these holes , and then inserting a substance that expands after injection as a consequence of a chemical reaction so that the substance reaches the cavities connected to the injection holes or are proximate thereto , the injection tubes being , preferably gradually retracted along the injection holes in the opposite direction with respect to insertion , to allow the substance diffusing in cavities crossed by the injection holes or proximate thereto .