The waterproofing of the floor slab protects the structure from penetrating moisture. A lack of or inadequate waterproofing can result in damp walls. Thus, the habitability or usability of a building depends heavily on successful waterproofing.
requirements for the waterproofing of a floor slab and its professional execution are regulated in DIN 18195 (2017) "Waterproofing of buildings". The floor slab can be confronted with moisture in different ways. These load cases each require different sealing measures, which are regulated in the above-mentioned DIN.
A distinction is made between the following 4 types of moisture in particular:
In order to reliably seal the floor slab against the above-mentioned types of moisture, DIN prescribes a complete barrier of the surfaces in contact with the ground. In principle, there are three different types of waterproofing that can be relevant in the field of floor slab waterproofing:
Waterproofing against residual moisture from the substrate is used in the flooring of false ceilings. They are used when a fast construction method and long drying time of the substrate make it necessary or when drying problems occur with mineral substrates.
For the planning of the waterproofing, the local conditions must be carefully examined. This includes weather sides, soil conditions, topography (e.g. slopes) and the expected use of the rooms. In order to determine the type of waterproofing, qualified opinions of various parties should be consulted.
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