Even if concrete is increasingly being used as in-situ concrete or prefabricated parts in modern new buildings, more than half of the cellars are still being bricked up. In addition to selecting the right type of stone for stability, the waterproofing must be carried out properly.
Black tub and stone types
The walling of a cellar can be done by experienced do-it-yourselfers with a high proportion of personal contribution. This saves a lot of money on building the basement. The brick cellar is called "black tub" in technical jargon. The finished walls are sealed with black bitumen.
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A "white tub" is made of special concrete and is technically very complex. Therefore, only a specialist company can carry out this cellar variant properly. The basement construction is subject to approval in every version. Standards define material and design. Six different types of stone are permitted for the walls of the cellar.
- Masonry bricks
- Sand-lime bricks
- Aerated concrete blocks
- Hollow lightweight concrete blocks
- Solid lightweight concrete blocks
- Concrete blocks
Calculation factors and reinforcement
When calculating the stability, several force influences in front of the cellar walls must be taken into account. The tension direction of the walls, the loads from the building floors placed on the walls and the lateral earth pressure load are specified. There are the horizontal and the biaxial load transfer method.
Different wall reinforcements are installed for additional stabilization. For horizontal bed joint reinforcement, iron rods are inserted into the mortar between the rows of stones (€ 7.79 on Amazon *). Vertical reinforcement can be installed on hollow blocks and shaped stones. Here the iron bars are pushed through the wall from above and fixed with liquid cement.
The basement floor is the critical point for sealing the masonry cellar wall. Here, also subject to approval, seals in the vertical and horizontal directions must be carefully and professionally combined.Tips & Tricks If your house is built in a region with a high groundwater level, with a risk of flooding or on a hillside, a "white tub" is often unavoidable.