Doncaster Membrane Installations Ltd


Doncaster Membrane Installations are a Specialist Geomembrane Installation Company. We have particular expertise in Design, Supply, Installation & Validation of Soil Gas Protection Measures.

These are commonly installed to protect against the ingress of contaminants and soil gases in domestic, commercial and industrial buildings and include:

  • Methane
  • Carbon Dioxide
  • Hydrocarbon Vapours
  • Radon

At DMI Ltd we have a workforce that are qualified to NVQ Level 2 Gas Membrane Installation standard who are more than competent to carry out the installation on your project.

Our close allegiances and partnering with leading product manufacturers allows us to provide cost effective, fit for purpose solutions designed to both CIRIA C665 and the NHBC (Witherington & Boyle) Documents.

Proprietory Soil Gas Barriers

DMI Supply proprietary gas barriers relevant to your project requirements. We stock a good selection of quality membrane and the associated accessories, such as, double sided tape, flashing tape, preformed corner details, top hat details for around pipe penetrations and self adhesive gas membrane. We also stock protection fleece and venting media accessories.

Gas Membrane Installation

At DMI Ltd we have a workforce that are qualified to NVQ Level 2 Gas Membrane Installation standard who are more than competent to carry out the installation on your project.

Over the years we have built up a relationship with most of the countries leading construction companies and house builders. Feel free to browse some of our quality installations in the gallery.

DMI offer a full supply and install package. Products available are:

Reinforced membranes
Foil based membranes
Polypropylene membranes
Self adhesive gas membranes
Top hats
Gas dispersal system
Gas resitant DPCs
Detail flashing strips
Collector pipe
Vent Ts
Aspirating cowls
Vent stacks
Vent bollards
Vent boxes

All materials will be prefabricated within DMI facilities wherever possible to reduce site time and, therefore, provide a more programme friendly installation service.

Supervision of Installs

DMI Ltd offer a Supervision package to self install/groundwork contractors.

A Supervisory Operative holding the NVQ Level 2 in Gas Membrane Installation will guide your workforce through the install process from the preparation of the substrate to the joining of sheets, pipe penetrations and corner details along with perimeter details and more complex detailing work.

Throughout the process each stage can be photographed and evidenced that the install has been carried out to an acceptable standard prior to an integrity test if required, and can also be used in our validation and verification process.

Integrity Testing and Validation

DMI Ltd offer a service consisting of Integrity Testing and Verification of Installation of Gas Membranes.

These can be carried out by our trained and qualified staff or one of our Consultants.

The testing and reports will be carried out and issued as per the latest CIRIA guidelines on this process 'Good Practice on the Testing and Verification of Protection Systems for buildings against Hazardous Ground Gases' due to be published later this year.

Value Engineering

At DMI Ltd we have, through our varied Suppliers, the ability to offer value engineered solutions to your gas protection needs.

Bespoke systems to ensure the quality and integrity of the install meet the requirements of regulations.

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