CURTAIN 01

For Dekmantel Festival 2025, the iconic Selectors Stage was given a new dimension. High among the trees of the Amsterdamse Bos, a floating textile roof appeared – a structure that not only offered protection from the rain but also created a unique atmosphere between nature, audience, and music.
Under the direction of Johannes Offerhaus of Zelt.studio, a light, almost weightless piece of architecture emerged: a play of fabric, ropes, and steel that nestled subtly within the forest. What began as a simple idea – stretching a piece of cloth between two trees – evolved into a refined tension system. Four slender steel columns, carefully hidden among the greenery, supported a network of aluminum and cables that held the fabric in place.
The result was a sculptural canopy that moves with the wind, catches the sunlight, and hovers above the crowd like an intergalactic sailing ship. A stage covering that is not only functional but also poetic.
Tentech provided the engineering and verified the design, making this extraordinary project a reality.

Pictures: Woody Bos

Specifications

Customer:: Zelt.studio
Client:: Zelt.studio
Architect:: Johannes Offerhaus (artist)
Year:: 2025
Services:: Structural design/ structural analysis, creating tent book
Materials:: Spinnaker fabric, polyester webbing, paracord, aluminum, steel, steel cable
Surface:: Fabric surface area: 61 m²

Projects

More projects

Festivals and events projects

Whether you will come across them at a dance event, product launch, the Floriade or the Volvo Ocean race, structures designed by Tentech are used for events all over the world, such as demountable pavilions, tents and temporary covers. We strive for an integrated design of structural and architectural elements; merging the demountable character and aesthetic quality of the object.

Worldwide assistance

Travelling structures should be used safely while exposed to various conditions. We ensure that our clients can erect their demountable tents or pavilions anywhere in the world. For this purpose, we apply our knowledge on international codes and regulations and – if desired – guide our clients in their communication with local authorities.

Modular building systems

The structural argumentation of demountable structures as well as the correct and secure assembly method is written down in a so-called building book or tent book. We always strive for a security level according to the applicable codes and standards. As an alternative, we can formulate usage restrictions in case the structure cannot meet the requirements. In addition, we make an inventory of the safety measures that should be applied.

TÜV examination

Tentech has good contacts with several TÜV authorities in Germany. Providing advice and guidance to our clients during the examination process, is part of our service.

Tent books

For the Dutch market, Tentech focuses on composing Tent books, also called Building book or Baubuch. The Tent book contains all information about the structure requested by local authorities to fill out the safety plan and grant authorization. Linked to the current Eurocodes, the Tent book is able to bridge the gap between existing (expired) German, English or French tent books and the needs of the Dutch local authorities.