DURABIT T for Civil Engineering


DURABIT T – safe + impervious


DURABIT T only requires some simple pre- installation work on the sub-soil. The membrane can then be efficiently and quickly placed, and reliably seamed by hot-wedge welding or hot air welding.

Environmentally friendly

DURABTI T plastic dealing membranes are immune to ageing. This quality building material is environmentally sound in manufacture and use. It is plasticizer and chlorine free and it is completely harmless to health, water, earth and plants.

Oriented to the future

DURABIT T is manufactured using a sophisticated and high quality process. It complies with, or exceeds, the relevant test standards.
It can be anticipated that DURABIT T will provide decades of service, when used in the proposed applications.

DURABIT T – modified HDPE sealing membranes of Ethylene Copolymer (ECB) are extremely immune to ageing as well as being root resistant. Additionally, they are manufactured under very strict quality control.


The sealing of basins, dams, ponds, tunnels, foundations, landfills, landfill leachate collection basins and traffic structures. These are the applications which illustrate, qualities which DURABIT T sealing membranes are renowned to have.

Main advantages

  • very sturdy and robust so it can hardly be damaged when the membranes are installed
  • high elongation, even under biaxial stresses
  • resistant to ageing and rotting
  • resistant to most chemical substances including dilute acids and alkalis
  • a safe bonding technique using hot-air/hot-wedge welding
  • resistant against micro-organisms
  • high tear resistance
  • root resistant
  • plasticizer free
  • biologically neutral
  • UV resistant


Earth works and Hydraulic works

DURABIT T – sealing membranes, with 2 mm thickness and a width of 2 m, are especially suited for this field of application. Due to their high flexibility, they can be installed efficiently, economically, and quickly.

Tunnel and pressure gallery construction

DURABIT T – sealing membranes have proved themselves especially valuable in these applications, due to their high elongation. Cracks in rock, or in shotcrete linings can be properly sealed if DURABIT T is installed correctly. The membrane’s excellent strain characteristics permit it to bridge across cracks safely.

DURABIT T sealing membranes can also be used in open cut underground construction. For example, they are used in underground railway construction in many countries across the world.

Road and highway underpasses

With these structures, which partly have to be built below the groundwater level, it is vital to include the complete waterproofing plan in the design stage.
A reliable solution can be realised with DURABIT T – sealing membranes and anchor and/or DURAFLEX water stops.

Foundation concrete protection

Foundation and /or concrete structures, which are built below the ground water level, require the use of sealing membranes as a permanent protection. This is equally true whether there is water pressure present, or not. DURABIT T sealing membranes are permanently resistant to acids in the soil, as well as to all substances occurring in the ground water. They retain their protective properties even when under stress. For example: structural movements, shrinkage, temperature fluctuations, settling of the soil, etc.

Air pressure testing

Welded seams can be tested by applying pressure to the inside channel of the seam, as a means of non-destructive testing.

Welding techniques

During installation, the sealing membranes have to be overlapped and then seam welded. This is achieved by using welding equipment such as automatic welding machines, which have proved to be efficient and have been tested for suitability. This equipment can be a hot-wedge welding machine, or a hot air welding machine.
When welding is to be undertaken it is essential to determine the principal factors which can affect the work, for example, welding temperature, welding pressure and welding speed.
These pre-determined parameters must then be exactly followed. Overlapped membranes can be seam welded in single or double joints and can be checked according to the chosen test method.


Loose laid
For excavations and foundation sealing
Thickness: 2,0 mm acc. to DIN 16729
Width: 2 m
Length: 20 m
Special requirements, thickness, silver signal layer on request
DURABIT X15T Thickness: 1,5 mm
DURABIT X25T Thickness: 2,5 mm
DURABIT X30T Thickness: 3,0 mm

DURAFLEX (external) Waterstop Profiles

In civil engineering, waterstop profiles are used to seal joints.

DURAFLEX waterstops are external and are available with or without extension channel.

DURAFLEX can be welded to HDPE, HDPE modified, FPO and ECB.

DURAFLEX anchor strips should be inserted and encased in concrete during the form work phase of construction work. To ensure an homogeneous bond the strip should be thoroughly cleaned, to remove all traces of concrete.

DURAFLEX SDA 320/6 – with extension channel
DURAFLEX SDA 400/6 – with extension channel

Other delivery formats on request only.

Standardlength: 25 m/ rll.

Anchor strips

The anchor strips should be inserted and encased in concrete during the form work phase of construction work. To ensure an homogeneous bond the strip should be thoroughly cleaned, to remove all traces of concrete.

The information contained within this publication is given to the best of our knowledge and is based on our experience. The actual use and installation of our products is, however, beyond our control. For this reason our guarantees are limited to the quality of our materials and they do not cover their successful use. In addition, nothing contained in this publication may be construed as a proposal to use any of our products in conflict with any existing patents. January 2007