100 mm thick insulation provides effective protection against moisture and good thermal insulation. 200 mm thick insulation meets the Swedish National Board of Housing, Building and Planning’s energy requirements for new construction, offers double the drainage capacity, allows the wall to dry out more effectively, and reduces energy consumption.

Extensive drying is required when the building is founded on soil without capillary-breaking material; in such cases, moisture damage is often visible on the interior of the walls. Minimal drying is required when the building is founded on capillary-breaking material such as insulation, macadam, or gravel. However, each building must be assessed individually.

What type of soil should be used to backfill the trench?

Backfilling with sand and gravel soils:
(This calculation assumes that the soil lies above the water table.)
Applies to soil with a density of up to 19 kN/m³ and a coefficient of friction of ka = 0.31
See our design table for earth pressure

Backfilling with clay soil:
Applies to clay soil with a density of up to 17 kN/m³ and a shear strength of 15 kPa.
See our design table for earth pressure

Select whether the backfill material will be compacted using a soil compactor or manually.

If the depth is the same all around the building, select 1 wall. If the walls have different depths, select the number of walls with different depths. If the wall has different heights on the left and right sides, it counts as one wall; enter wall depth 1 and wall depth 2, respectively.

Enter the total length of the wall section.

Enter Wall Depth 1, which refers to the measurement from ground level to the bottom edge of the foundation footing. If the ground slopes along the length of the wall, you also need to enter a value in the Wall Depth 2 field. To get a good estimate of the depth before excavation, you can make a rough calculation as follows:
1. Measure from the inner floor up to the bottom edge of a basement window (see X in the figure).
2. Measure from the bottom edge of the window to ground level (see Y in the figure).
3. Then calculate Wall Depth 1 using the following formula: X – Y + 0.35.

Specify Wall Depth 2, which refers to the measurement from ground level to the bottom edge of the foundation footing. Wall Depth 2 is specified if the ground slopes (inclines, descends, or rises) along the wall.

The base plate on your wall can have a straight edge or a projecting base plate. For a straight edge, no value is specified. For a projecting base plate, specify how far the base plate projects from the wall. Specify this in meters; for example, 0.15 for a 15-cm projecting base plate.

If the wall is located on a slope, Pordrän must be used. If the wall depth exceeds 3 m, or if there is a risk of significant groundwater flow for reasons other than the slope, Pordrän must also be used in this case.