BEDRAIN Drainage Grids


Functionality of BEDRAIN Drainage Grids



BEDRAIN Drainage Grids can be used to full advantage on any reasonably even surface. It doesn't matter whether the surface against which the BEDRAIN Drainage Grids are to be laid is a soil subgrade or a vertical structure or building element.

BEDRAIN Drainage Grids can be laid both horizontally and vertically. The excellent pressure/compression characteristics of the grid maintain the required drainage capacity even under very heavy loading, to ensure unpressurised discharge of the collected water. Depending on the type of application, ground, aquifer or surface water can be systematically collected and drained away.

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The non-woven geotextile that is bonded to the grid acts as a filter, holding back the fine soil particles and preventing them from being washed into the drainage core. The ideal aperture width creates a stable filter system, effective for all common types of soil.

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BEDRAIN Drainage Grids can also be used as a separation layer in the boundary layer between two different types of soil. This can increase erosion stability and also lead to an increase in interfacial tension due to the draining of the interface.

This increase in tension at the contact surface is an important factor in the structural analysis of surface sealing systems in landfill sites, for instance.

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Areas of application of BEDRAIN Drainage Grids


BEDRAIN Drainage Grids are used in civil engineering and building construction where seepage or embankment seepage flows need to be drained away as quickly as possible in order to avoid the accumulation of water. With the help of BEDRAIN Drainage Grids laid beneath the foundation slab, water can be permanently prevented from circulating around and entering the structure.

Bridge abutments in compliance with the RiZ WAS 7 specification drawing
BEDRAIN Drainage Grids with a bonded geotextile on both sides meet the requirements of specification drawing “WAS 7” for the drainage of contact surfaces between bridge abutments and backfill materials.

They also represent a cost-effective alternative to hand-laid concrete filter blocks, since the rolls of drainage grid are significantly easier and quicker to install.

Bridge abutments in compliance with the RiZ WAS 7 specification drawing

Protection of structures and buildings

As with bridge abutments, BEDRAIN Drainage Grids can be used on the soil side behind L-shaped retaining elements or other facing elements.

The filtering function of the bonded geotextile is of particular benefit here. The fine particles of the backfill soil cannot be washed out. As a rule, a drainage grid with a geotextile bonded on just one side, the side in contact with soil, is sufficient.

As in the two previous examples, BEDRAIN Drainage Grids can also be used to provide vertical drainage for basement walls. The grids support the sealing effect of a black waterproofing coat and protect it from damage when the excavation is backfilled and compacted.

Drainage of backfill to structures

Landfill sites and contaminated sites

Due to their excellent resistance to ageing and chemical attack, BEDRAIN Drainage Grids can be used for the purpose of gas and water drainage in landfill sites.

As part of the surface sealing system of landfill and contaminated sites, BEDRAIN Drainage Grids increase the structural stability of the sealing system by draining seepage water away quickly and effectively.

Landfill and contaminated sites

Paved surfaces

One of the special features of BEDRAIN Drainage Grids is their suitability for use as a high-performance horizontal drainage layer under roads and paved areas.

The combined benefits of reduced layer thickness and high drainage capacity, even under heavy loading, make it possible to create stable solutions for green roofs, multi-storey car parks, tunnels, etc.

Advatages of BEDRAIN Drainage Grids

The advantages of BEDRAIN Drainage Grids

  • High drainage capacity maintained with an overburden of up to 1000 kPa
  • High chemical resistance (even to chlorinated hydrocarbons), well into the highly alkaline range
  • Robust, to cope with installation conditions on site
  • Easy to prepare and easy to lay
  • The bonded geotextile has good mechanical and hydraulic filter properties
  • Outstanding long-term stability
  • Good cost-benefit ratio
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Installation of BEDRAIN Drainage Grids

Installation instructions for BEDRAIN Drainage Grids

  1. The subsoil surface should be as smooth and even as possible in order to ensure full contact with the composite material across its entire surface.
  2. The drainage grid must be laid flat and without creasing. Creases resulting from the shape of the structure should be removed by cutting the material and allowing it to overlap like roof shingles.
  3. The longitudinal joints must be formed by butting the drainage cores together. The geotextile that projects on one side should overlap the neighbouring grid to form a continuous filter layer. At the edges of the area to be drained, the geotextile overlap at the sides should be folded down around the drainage core to prevent fine particles from washing into the drainage grid from the side.
    At the end faces of the area to be drained, a strip must be cut from the drainage core so that the geotextile overlaps and can be folded around the edge of the drainage core in the same way as at the sides. Alternatively, an additional geotextile can be used.
  4. Vehicles must not drive directly on the geosynthetic material. When filling and compacting material on top of the drainage grid, care must be taken to prevent displacement or creasing of the drainage grid.

Our detailed installation and laying instructions for BEDRAIN Drainage Grids must also be observed.

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BEDRAIN Drainage Mats
BEDRAIN Drainage Mats

Polypropylene drainage mats with non-woven fabric bonded on one or both sides, for demanding drainage applications in underground structures, green roofs and landfill sites.... To the product

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Picture Mr Stefan Bermüller
Mr Stefan Bermüller

Sales Director Geosynthetics

Telephone: +49 (0) 911

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