Installation guidelines for ground slabs

Ground floor insulation

The foundation must be very even and include at least 100 mm of draining material. The drainage layer must also be put under the edge beam. The beam should be well compressed and planed, and surround the draining pipe well. If the ground consists of clay, silt of fine sand, use a layer of fibre tissue (usage class II) and a separation layer under the drainage layer. For loads up to 20 kPa, use PAROC GRS 30. For greater loads, use extruded polystyrene.

There are various ways to construct the edge beam. Install some of the seating elements either with or without face formwork.

Lay PAROC GRS 30 slabs so that no four corners meet and there are no continuous gaps. This forms a capillary break. To avoid continuous joints, use two layers of slabs. Use gangplanks for material transport with carts, for example, or if there is a lot of pedestrian traffic

Use reinforcement supports with a support area of at least 100x100 mm so they do not sink into the insulation.

If there are embedded products (e.g. sewer, wells), secure these to their correct positions before casting with palletisation that rests on the drainage layer. Always try to minimise the cold bridges.

After concrete casting and the removal of any face formwork, install the drainage. Lay the drainage pipes so their edges are at least 150 mm under the edge beam. Refill the area around the drainage and against the edge beam with drainage material up to 300 mm above the upper edge of the pipes. We recommend the use of fibre tissue around the drainage material so as to prevent fine particles from entering the drainage pipes.

After refilling, take care that the ground surface has an incline of at least 1:20 at a distance of 3 metres away from the building. When smoothing the land, be aware of subsidence. Connect the drainpipes to the surface water pipe.

When the thickness of the insulation increases, use perimeter insulation around the building to prevent frost heave from underneath the building. For this application we recommend extruded polystyrene.