The Cellar Seal Against Moisture and Water in The Basement

The damage caused by improperly executed basement insulation is disproportionate to the comparatively low cost of proper, permanent performance. The professional execution of the basement waterproofing requires a cross-performance coordination between the soil surveyor, the construction company and the building sealer.

In compliance with the usage-related maintenance measures, a functional capability for residential buildings is required for a period of up to 40 years.


Cellar seal against: soil moisture, non-pressing water and pressing water

With moisture sealing, a distinction is made depending on the attack of the action of water

  • Waterproofing against soil moisture
  • Seals against non-pressurized water
  • Seals against pressing water

In general, horizontal seals are applied to the foundation bottom plate and vertical seals on the walls. The substrate must be level, not sharp and hollow, and sufficiently dry. In addition, the application of a suitable bonding agent is required. Execution under production-damaging conditions, which can influence the execution quality, is to be avoided. These include, for example, surface temperatures that are less than five degrees Celsius or more than 80 degrees Celsius. In order to be able to reliably produce the vertical seal in excavation pits, there must be a working space at least one meter wide for excavation pit enclosure.


Polymer bitumen waterproofing for basement insulation

Sealing membranes must be tested and suitable for the specific application. In the case of polymer bitumen waterproofing, the minimum thickness against soil moisture is five millimeters , against non-pressing water nine millimeters and against pressing water ten millimeters. Plastic sheets should be glued between bituminous membranes or protected with an additional protective layer. Its nominal thickness shall be 1.5 millimeters or more, depending on the type of plastic and the stress class against soil moisture and against non-pressurized water, against oppressive water at a height of less than four meters also from 1.5 millimeters and at a height of more than four Millimeters at least three millimeters.


Protection by thermal insulation or bubble wrap

Connections and terminations must be at least 30 centimeters above the surface level and must be watertight up to their upper end, this also applies behind composite thermal insulation facades. To ensure this, adhesive flanges, clamping flanges or gaskets must be provided. The distance between penetrations and other components must be at least 50 centimeters, Penetrations through seals against pressurized water are to be provided with jacket pipes with loose or flanged constructions. At expansion joints adequately dimensioned joint tapes or joint chambers or appropriate joint formations are to be provided. Completed seals are to protect by means of protective layers, which may consist of thermal insulation, dimpled sheets or the like. If this work is performed by different contractors, an official acceptance and performance transfer is required.


Correct maintenance of the basement insulation

Even with structural waterproofing maintenance measures are required. These include, for example, ensuring proper draining of drainage lines, elimination of undesired plant growth and contamination, and repair of short-lived materials. This affects, for example, corrosion coatings and joint fillers.

An essential condition for the perfect execution of the work is the self-monitoring of the exporting company. In order to guarantee this, building sealers require special training. Self-monitoring involves reviewing the detailed planning with regard to whether it complies with the rules of technology. The same applies to the selection of materials used. At the Institute of Flat Roof Construction and Waterproofing, KapitalBasements are available that will help site managers to properly assess the workmanship.


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