Floralis: A Sustainable Timber and ETFE Pavilion Protecting Prehistoric Heritage

Floralis is a forward-thinking structure designed and built by researchers from the University of Pennsylvania. It stands in the Florissant Fossil Beds National Monument in Colorado. The pavilion, amde of timber and ETFE, protects ancient petrified tree stumps (PTS) from harsh weather while still allowing visitors to see them clearly. This project demonstrates how smart design and sustainable materials can preserve heritage in an innovative way.

Strong and Lightweight: Timber and ETFE Working Together

The structure uses two key materials: multilaminar timber and ETFE (Ethylene Tetrafluoroethylene). Timber forms the main shell, while ETFE wraps around it to provide protection. ETFE is used for its transparency and UV-resistance. As a result, it is increasingly used in architectural applications such as façades and lightweight roofing.

Each timber piece was carefully shaped using CNC milling. The design software communicated directly with robotic machines, which ensured every part was cut with precision. This digital workflow saved time and reduced waste.

Advanced Fabrication Meets On-Site Flexibility

The team used robotic fabrication to produce not only the timber elements but also the aluminium channels that support the ETFE film. These channels were angled precisely and attached using a flexible connection system. This made the structure strong while keeping its clean and open appearance.

To guide the installation, the team created a digital twin of the site using laser scanning and photogrammetry. Thanks to this approach, they could make accurate changes on location. As a result, the pavilion fits seamlessly into the natural setting.

A Design That Protects and Educates

The pavilion helps prevent erosion caused by daily freeze-thaw cycles. At the same time, it remains open so visitors can still experience the tree stumps. In this way, Floralis balances preservation with accessibility.

Construction was completed over three site visits in Florissant, Colorado. Sensors were added to monitor the structure’s thermal performance. These insights will support future sustainable design projects in similar environments.

By combining natural materials, modern technology, and conservation goals, Floralis sets a powerful example. It shows how design can protect our environment while enriching how we experience it.

Source & photos: University of Pennsylvania