ENGLISH

HOW TO TREAT DUMP WALLS

Our school has been recently treated because of problems due to moisture.

The moisture attacked two old buildings out of three and it could be originated both by: the air in the form of condensation and by the ground in the form of ascending moisture.

The humidity condenses when you have a drop in temperature or when it gets in touch with a cold surface. You have this problem especially in winter when the rooms are not protected enough from the atmospheric agents and the walls made of bricks don’t offer good insulation.

Another cause of moisture is that it ascends by capillarity. In this process the water rises up above its static level through a very small channel, rarely it rises above two meters. It causes some disadvantages, such as unhealthy rooms, a greater use of energy for the heating, the emission of mineral salts and disintegration of plaster.

There are different methods of intervention.

One is the electrolysis process that consists of an application of electric current that causes the movement of the water between the poles.

Another method is the application of the prismatic siphons of Knopen made of plastics or “lateritius” that permit the evaporation of water.

A good method to be used is the cutting of the wall with a machine that cuts the wall, inside which waterproof resins are put.

Another effective method is the creation of a chemistry barrier , obtained by the application of resins under pressure and free falling through holes 15-20 cm far one from another.

After the treatment the walls should be left without plaster to permit the evaporation of the remaining water. After that you must apply transparent plaster and painting.