• Air blown two-layer biogas roof with variable gas volume.
  • Diameters between ø2 and ø50 meter.
  • Suitable for all European wind and snow zones.
  • Available in almost any desired height.
  • Also available with single thermal insulated (HR+) or double thermal insulated (HR++) membranes.


double membrane roof

The Flexxodomer – DOuble MEmbrane Roof and thus DOMER – is a double layer or double membrane biogas roof that is often used in the biogas industry. The biogas roof is extremely suitable for silos where biogas is stored and/or where sustainable energy is generated. This double membrane roof can be used for biogas installations with a gas motor as well as a gas cleaning installation. The characteristic convex shape combines a maximum gas storage volume with an optimized shape for external influences such as wind and snow. In addition to this convex shape, a rectangular design is also possible. The Flexxodomer has been designed by Flexxolutions to ensure a maximum lifespan in all circumstances and is therefore extremly durable for our customers. We realise this by using the best materials on the market, a bi-axial design, tested components and by certified production and assembly.

Bovenaanzicht DoMeR constructie 530x600 px -dubbellaagsbiogasdak-

why the flexxoDOMER and not a regular DOUBLE MEMBRANE ROOF

  • ArtboardCreated with Sketch. The design of every Flexxodomer is customer specific optimised on local conditions such as wind and snow. This significantly increases the lifespan of your double membrane roof!
  • ArtboardCreated with Sketch. We carry out bi-directional tests on the foil by means of tensile tests and we carry out corrections in both directions of the foil. This prevents a 'pumpkin-like' shape and guarantees an optimal design.
  • ArtboardCreated with Sketch. The support construction is standard designed for a snow load of 85 kg/m², so that no damage can be caused in extreme weather conditions.
  • ArtboardCreated with Sketch. All our metal parts that might get in contact with gas are always made of stainless steel-316 because of the minimum sensitivity to corrosion (rust).
  • ArtboardCreated with Sketch. For each domer you get an extensive report in which all strength calculations, conditions and the resulting force on the silo wall are calculated. By checking this with the silo builder, we can prevent unforeseen problems, so that a maximum lifespan can be achieved.
  • ArtboardCreated with Sketch. We test a lot, so we can deliver the best quality to you. For example, we have a test stand for the Flexxodomer where we regularly carry out tests to improve the design, production or assembly. More information about our quality tests? Then click here!
  • ArtboardCreated with Sketch. Our foil suppliers give a six year guarantee on the material and we give a six year guarantee on the design and processing.


We have the entire chain of sales, R&D, project engineering, production and assembly in-house. This enables us to guarantee you the best quality at the best price.

Your wishes are most important to us. Our experts use our basic design to engineer your project, which ensures an optimal design at the lowest possible investment.

In addition to our sales experts, we also employ mechanical and chemical engineers and textile experts, as well as highly trained professionals in production, assembly and administration to provide you with the best advice.

Every project is customer specific. This keeps us sharp and provides you with the very best cover!

We have been innovating in technical textiles products for decades. We know the market and its possibilities like no other and we cannot wait to share this knowledge with you.

specifications flexxoDOMER

  • Available and successfully realised in diameters from ø2 to ø50 metres.
  • Delivery always includes support construction, desulphurisation net, edge clamping, visual gas volume meter and support air system.
  • Rectangular available up to 40*70 meters, for other dimensions ask our sales manager.
  • The Flexxodomer can be supplied as a thermally insulated roof. Standard as single thermal insulated (HR+) or optionally as double thermal insulated (HR++) air blown roof.
  • Standard foil; polyester fabric with 2-sided PVC; 4,000 N/5 cm (900 g/m²). The foil that is used in our products is extremely stable in shape, it has a breaking strength of 8000 kg per linear metre produced by a West European supplier. Stronger foil possible if desired or needed.
  • Alternative foils for gas membranes such as fPP, Alcryn, N-PVC are available if required or requested.
  • Standard operating pressures from -0.5 to +3.5 mbar. Higher pressures possible if required.
  • Centre columns at least FSC tropical hardwood D60. Stainless steel columns available if desired (both 304 and 316).
  • The designs of our covers are approved in all countries in Europe. Standard according to German TI-4, according to TRAS-120 is possible on request.
  • In standard execution the roof has a spherical shape with a clamping system on top of the wall. We can also supply other shapes such as pointed roofs and membranes for the 'Schlauch' system.
  • Matching overpressure and underpressure valves and various types of electronic gas volume meters are available as an option.
  • Design optimised for no or minimal biogas loss in case of sudden sun appearance.
  • Support construction standard designed for 85 kg/m² of snow load.

Any questions?

Would you like more information? Feel free to contact Yeliz:

Are you looking for a different kind of cover?


The Flexxocover is suitable for concrete, element and steel silos and has been successfully assembled by us on more than 1000 tanks.


The gastight execution of the Flexxocover ensures its gas-tightness thanks to the gastight top construction, manholes and transition from silo roof to silo wall.


The Flexxocover with lung is a double layer membrane roof. The inner membrane keeps (bio)gas inside and the outer membrane keeps out external influences.

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