The current earth cellar is built either from
1) concrete, cast-in-place or collected elements or
2) using bricks for masonry.
The following things must be noted for water insulation: The floor structure must go clearly over the layer of the groundwater. Under the floor surface, outside of the basis, there should be a sufficiently good drainage, taking rainwater, meltwater and the possible other run-off water from the surrounding areas into account.
The wall and roof structures must be such that water installation can be installed in a seamless way. The roof should be tilted in a way that ensures that there are no locations for water to collect in puddles, regarding the water insulation. On top of water insulation there should be a structural level, where the water can, as freely as possible, leak to subsurface drainage without causing any water pressure in structures. This means that there is no water left in the structures that might, when freezing, cause a mechanical burden for water insulation.
The surfaces to be insulated to improve the grip are processed using a Katepal K-80 bitumen solution (BIL 20/85). The water insulation recommended on the roof is a two-layer elastomer bitumen membrane combination, where both membranes fulfil the requirements of the product class TL2. The underlay is a welded K-MS 170/4000 or a plinth or radon membrane and the top sheet is a welded K-PS 170/5000.
The wall generally only requires a simple water insulation, welded elastomer bitumen membrane K-MS 170/4000. Due to possible unevenness of the surface, the membrane must be attached with particular care. The upper edge of the membrane must be anchored mechanically from below the connected membrane, coming from above.
As drainage, on top of the water insulation, the stubble-covered Katepal Plinth, which is installed so that the shingle on the roof is overlaid 10-15 cm over the upper border of the plate on wall, should be used. The lower border of the plate on wall is taken below the floor surface, so that the draining water can
flow to the drainage as easily as possible.
Particular care needs to be paid to arranging the ventilation in a well-insulated land cellar.