Many historic buildings lack horizontal and vertical insulation or have it in such dilapidated condition, that it no longer resists the penetration of moisture, especially the walls being pulled upwards. Usually, for the effective protection of brick structures, it is usually necessary to insulate the walls horizontally, and in buildings with basements also vertical insulation, especially when the walls are exposed to direct or groundwater.

When installing horizontal insulation, it is necessary to cut or cut the wall in order to create a horizontal joint, which, in turn, is filled with a layer of anti-moisture insulation made of materials of appropriate durability, resistance and endurance.

With good accessibility and wide horizontal gaps, bituminous roofing felt is used as insulation, in difficult conditions and with very narrow gaps, copper and zinc sheets or foils can be used.

Manual cutting of walls, to create a slit, is the simple way, although very labor-intensive and in some cases impossible to recommend, either due to the dynamic nature of the impact, or because of the safety of works. Thinner brick walls, the joints of which are filled with lime mortar, can be easily cut with an ordinary handsaw. In the case of thick walls, regardless of the type of structure, it is more advisable to create a gap by cutting the wall with appropriately constructed saws powered by an internal combustion engine., compressed air or electricity. These tools are not available in all conditions, and their use is not always possible due to difficult working conditions, which mainly depend on the location of the walls in the building and the level of their cutting. It should be noted here, that regardless of the method used, making the gap for the insulation is carried out with successive sections of the wall, with the utmost caution and securing the stability of the system - the adjacent section of the wall may be cut out only after the previously made hole has been walled up and the new wall has obtained adequate strength.