Jointing a membrane to a preformed corner unit with Visqueen Gas Barrier

Building Regulations require proper precautions be taken to prevent danger to health and safety when building on contaminated land. Visqueen Gas Barrieroffers a safe solution for the protection of buildings against Methane, Radon, Stythe (a gas commonly found from disused mines, also known as blackdamp) and Carbon Dioxide; when installed in accordance with the relevant codes of practice such as BRE, CIRIA and the Chartered Institute of Environmental Health Ground Gas Handbook.

Visqueen Gas BarrierVisqueen Gas Barrier is a multi-layer reinforced polyethylene membrane with an integral aluminium foil that is approved for use in NHBC Amber 2 applications.

For ease of identification on site, Visqueen Gas Barrier is coloured blue on one side and silver on the other.

The barrier combines strength and performance with flexibility and easy installation. Visqueen Gas Barrier also acts as a damp proof membrane.

**Download the Visqueen Gas Barrier datasheet here**

In this video, we demonstrate how to create a joint using Visqueen Gas Barrier and a pre-formed 90 degree corner unit.

The tools required for this are, a roller with a neoprene wheel and a sharp knife or pair of scissors. To complete the job you will need Visqueen Gas Barrier, Visqueen double sided jointing tape, Visqueen Gas Barrier foil jointing tape (which is single sided) and the pre-formed 90 degree corner unit, which is reversible.

Visqueen Gas Barrier

To ensure that you create the best seal, we recommend that the double sided tape is applied to the corner unit before you start the installation process. This should be done in a clean and dust free environment.

Visqueen Gas Barrier

Apply the tape to the edge of the corner unit and use the roller to apply pressure across the tape to ensure that it is fully bonded to the corner unit.

Repeat the process for the other side of the corner unit. Here is an example of the completed corner unit;

Visqueen Gas Barrier

Position the unit in the corner of the blockwork ensuring a snug fit. Next, peel off the release film on the tape and position the gas barrier on the exposed tape ensuring that the membrane covers the whole width of the tape.

Visqueen Gas Barrier

Visqueen Gas Barrier

Ensure a gas-tight seal is created by applying pressure to the newly formed joint, using the roller;

Visqueen Gas Barrier 6

Now use the gas barrier, foil jointing tape and position it at halfway over the lap joint;

Visqueen Gas Barrier

Finally, apply pressure to the joint, using the roller;

Visqueen Gas Barrier 8

The installation is now complete.

For ease of identification on site, Visqueen Gas Barrier is coloured blue on one side and silver on the other. The barrier combines strength and performance with flexibility and easy installation.

  • BBA approved
  • Low permeability to Methane, Radon and Carbon Dioxide
  • Approved for use in NHBC Amber 2 applications
  • Multi-layer reinforced LDPE membrane with Aluminium core
  • High puncture and tear resistance
  • Complies with BRE and CIRIA codes of practice

Also consider – Gas Product Selector:

Radon CO2 Methane Hydrocarbons
GX Geomembrane  •  •  •  •
GX Flexi  •  •  •  •
Gas Barrier Membrane  •  •  •
Liquid GM  •  •  •
Low Permeability Gas Membrane  •  • •*
Radon Membrane  •

* Low levels

To learn more about our market leading technical support service when specifying your next project, contact Visqueen and we’ll help you throughout every stage of your scheme, from specification to installation. Please call0333 202 6800 or email the team on

Watch the installation video here.

About Visqueen Building Products

Visqueen Building Products is the market leader in the manufacture and supply of structural waterproofing and gas protection systems. Our range of solutions includes proven high performance damp proof membranes, damp proof courses, gas barriers, tanking membranes and vapour control layers.

Our product range includes:


Visqueen Building Products
Heanor Gate
DE75 7RG

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