Horizontal waterproofing

Masonry injection against hydrostatic pressure

Masonry injection is an alternative to additional insulation, e.g. in historical buildings, which must remain exposed. An example could be the above-ground part of the basement made of old brick or natural stone, which cannot be waterproofed from the outside, because it must remain visible according to the applicable requirements. Selection of appropriate materials is crucial in this case, because physical and chemical properties of some materials may negatively affect certain building materials. In any case, the requirements for the buildings must be met. The exact composition of masonry wall is determined by taking drill samples. Analysis of the samples shows the composition of the wall, number and volume of cavities, wall thickness and the materials used. The next step is determining the groundwater level. Structure humidity measurements at different wall heights and cross-sections help determine the level and distribution of dampness in the wall. Taking into account the type and purpose of the structure, waterproofing materials are inserted into the cross-section of the structure. They can be inserted across the whole cross-section or in specific parts only. The positioning of waterproofing materials depends on the size and locations of air pores and the position of injection nozzle network. 

Masonry injection against capillary rising damp (horizontal waterproofing)

There are two types of this injection method: chemical and mechanical. Mechanical injection helps fight rising damp by using a tin-plate or other waterproof material to block the way of capillary rising damp after making mechanical cuts in external or internal walls. Depending on the moisture level in the structures, chemical waterproofing can be done using two different injection methods. One of the main conditions for good horizontal waterproofing is the integrity of the structure, i.e. its solidity, achieved by the initial injection. It means that the pores and cavities in the structure are filled with a mineral substance using pressure or non-pressure injection. Of course, this is done only after determining the moisture level in the structure, number of pores and cavities, number and depth of drill holes and the distance between drills.

Taking into account the type of the structure and the existing conditions, horizontal waterproofing is installed at the basement level above the soil grade or in the external part of the basement wall above rainwater or groundwater level. In addition to renewed waterproofing, it is important to make it possible for the moisture to escape from the structure and to remember that evaporating moisture contains salts, which precipitate on structures and hygroscopically absorb moisture, which may lead to surface dampness.