Joint tape for secure and pressure-proof structural joint sealing - RubberElast®

RubberElast® is a self-adhesive compression sealant tape that has been tried and tested many times over for secure and pressure-tight structural joint sealing between pre-fabricated elements.

RubberElast® can be processed quickly and easily without additional tools. Self-adhesive RubberElast® is applied to the surface of a structural element on one side. Next, the precast element is mounted and the RubberElast® is compressed into the structural joint to fill it. After pressure is applied, the joint is immediately waterproof. We recommend use of the BT-Spannschloss (turnbuckle) to assemble precast walls. The material remains continuously elastic, which permanently seals the joint. Installation should take place in a temperature range from -10 °C to 40 °C.
RubberElast® also retains its elasticity at low temperatures. In addition to very good adhesion to concrete, the sealing tape also exhibits excellent adhesive qualities on metals, glass and other materials.

Typical usages include sealing precast concrete slabs/joints during hydraulic construction of cellars and other waterproof structures, including flange joints. Thanks to its resistance to aggressive process liquids and gases, RubberElast® is the perfect option, even for application in the wastewater sector. You can view the application of RubberElast® in our product video.

A testing certificate from the Material Testing Institute of Braunschweig guarantees its reliability.


  • Water pressure-tight up to 0.5 bar
  • Application from -10°C to +40°C
  • No swelling in contact with water
  • Resistant to weather, acid, lye and salt
  • Immediately waterproof
  • Permanently elastic



  • Hydraulic construction (e.g. angle-supporting walls in flood protection)
  • Sewer & civil engineering (e.g. shaft structures, media channels, amphibian tunnels), multi-storey
  • Residential & commercial construction (e.g. waterproof cellars, white tanks)


RubberElast® and other products can also be purchased in our online shop!

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Do you have questions?

1. Do the joints have to be cleaned?

Yes, the joint flanks must be dry and free from dust, grease, loose parts and other separating materials.

2. Do I have to apply a primer so that RubberElast® will adhere?

That depends on the substrate. RubberElast® is gene-rally applied without a primer. A primer can be used in addition if RubberElast® doesn‘t adhere to the substrate.

3. Which RubberElast® size should I use for my project?

The choice of the right RubberElast® size depends on the width of the joint flank and the final joint width.The RubberElast® is squeezed into the joint and com-pressed to 20% of its original size. This means that the material presses itself sideways into the joint.If the joint flank is too narrow, the RubberElast® will be pressed out of the joint. The sealing effect cannot be achieved if the joint width is too large or too small.Obtain professional advice on this from our emp-loyees. We will also be glad to send you our list for the selection of the correct size.

4. When can water pressure be applied to RubberElast®?

It does not react chemically with other substances, but water pressure can be applied to it as soon as it has been compressed properly.

5. How much force do I have to apply to compress the tape?

The force required depends on the chosen tape size and the prevailing ambient temperature.In order to calculate the correct force to be applied, please refer to the data in the technical data sheet.