In order to be able to dry a wall successfully, the method suitable for the construction and damage pattern must be used. Roughly, there are four different approaches, each still modified. In addition to the mechanical displacement principle, blockage and building physics are also used.
Two drying objectives
One requirement always arises when renovating damp walls: the moisture must be thoroughly and substantially removed from the masonry. The damage diagnosis and cause determination is indispensable prerequisite.
Most procedures work in two steps. They remove and displace existing moisture and then form a barrier against new moisture entry. During this process, pressure, heat and / or electricity are used during the drying process. The aim of all procedures is to seal the wall from the inside.
Damage analysis and causal research
A damp or wet wall develops many types of symptoms. When assessing damage and cause must be determined. The moisture can form from the outside, such as through the drainage of a basement wall. From inside the building, condensation is a frequent trigger.
Distinctive features are the musty smell of a wall, recurrent distant mold, curling wall coverings such as wallpaper and edges of water stains, often combined with efflorescence. Drying must always be accompanied by remedying the cause
Functioning of methods and procedures
1. Sawing, striking and cutting
One or more horizontally acting mechanical barriers are inserted into the wall. Three common methods are:
The cutting method
The wall is cut horizontally in one or more places. Sheets or foils are inserted in the cuts. Existing moisture must be removed with accompanying measures such as drying by heat. The method can not be used in any case, since the statics are influenced. R The Rammblechverfahren
In principle and mode of action similar to the cutting process. A corrugated sheet is driven into existing bed joints.
2. Injection procedure
Injection without pressure
Cold bitumen or paraffin are passed through several holes parallel to the masonry. They close all pores and cavities, but do not displace existing moisture inclusions.
Up to eighty degrees Celsius, the wall, the injection medium or both is heated. The heating causes existing moisture to evaporate or evaporate. The injection agent "conquers" the liberated cavities and capillaries.
Injection with low pressure
The existing moisture is displaced by the low pressure. Prerequisite is a "closed" masonry substance.
Injection with fogging
A special method to subsequently seal walls in the ground. The injection takes place on the wall outer surface.
3. Replacement and replacement
In the case of major damage, wall sections that have been pushed open are partially provided with new parts. Static very limited applicability. Elektro 4. Electrophysical Procedures
The introduction of electrical current into the masonry can move and displace moisture and water. The not uncontroversial procedures require high control effort and are expensive.