Among the several cases of isolation in monuments threatened with dampness, an instructive example may be the course of proceedings related to the conservation of the palace in Wilanów.

Palace and garden complex in Wilanów, due to its architectural and historical authenticity, presents exceptional value. The palace itself, built in the years 1677—1696, in the course of its history it underwent various vicissitudes and has survived to our times in a very bad condition, despite undertaking numerous maintenance. In year 1954 The Presidium of the Government has decided to carry out its general conservation. Among the numerous technical problems, the problem of protecting the facility against the destructive activity of groundwater and rainwater was one of the most complex..

Examination of the technical condition of the building revealed, that the constant dampness of the structural walls is caused by the lack of horizontal and vertical insulation. Moisture penetration contributed to the development of domestic fungus. Therefore, technical and construction works began with the installation of horizontal and vertical insulation throughout the palace.

Diagram of the assumption of anti-moisture insulation in the Wilanów Palace, 1677—1696 r.: a) putting on horizontal insulation, b) full protection of the wall 1 - hole after cutting the wall, 2- underground walls, 3 - horizontal insulation, 4 - a wall made after the installation of insulation, 5 - vertical insulation, 6 —The underground floor, 7 - ground floor ceiling

For this purpose, the stone terraces and plinths were dismantled, the floors in the ground floor rooms were removed, Structural walls were excavated from the outside and inside . Next, the installation of horizontal anti-moisture insulation was started, first horizontally 60 cm below the basement floor, and then under the ceiling of the ground floor at a height of approx. 30 cm above the ground. The walls were cut by hand with sections of approx. 80 cm and the height of several bricks. The surface of the cut was leveled with clinker brick, on which, in turn, a layer of waterproof mortar was laid and two layers of bitumen felt on top of it, lubricated with thick Abizol. After these works were completed, the cut sections were rebuilt on average 6 layers of clinker brick on a cement mortar with the addition of silicone as a sealing agent. It should be noted here, that the most troublesome stage of the works is the connection of the new wall with the old one, higher lying. In order to fill the joint with mortar, steel wedges are hammered into the joint, then introduces a sealing mortar, stuffing it with a suitable tool. After the mortar has hardened, it starts to work; in turn to the execution of the next, adjacent section of the wall.

Vertical insulation of basement walls was made only after they were dried and fungus removed. The technical procedure in this case consisted in cleaning the surface of the walls with wire brushes and twice smearing with technically pure allachloronaphthalene dissolved in xylene. Then, vertical insulation was made on a smoothly rapped substrate, lubricating the walls twice with Abizol.

After the building was protected from moisture and groundwater in this way, further conservation works were started.