thermal commons
a slow-down space in a high energy festival
Competition
Collaboration:
Buro Zuid (BE)
Client:
Horst Festival + Fritzkola
Location:
Vilvoorde (BE)
Date:
Spring 2026
Inspired by the ancient logic of the hypocaust, the project is conceived as a literal «heat battery» built from reclaimed clay blocks. By elevating the floor on a series of modular pillars, the architecture creates an atmospheric void where a semi-concealed fire radiates warmth directly into the ceramic tiles above. In this system, the fire is transmuted from a singular, local source into a vast plane of shared surface energy. This gesture transforms the platform into a collective furniture piece, inviting festival-goers to recline, gather, and absorb the thermal energy in a shared spa-like experience.
The pavilion is designed as a choreographed interplay of the four elements. While the upper surface provides a clean, heated plane for rest, the existing low curved bench at the perimeter offers a more visceral connection to the hearth. A specific spatial duality is crafted here: the visitor can oscillate between the focal, high-intensity experience of the «bonfire» and the diffused, democratic warmth of the platform’s skin. Here, visitors can sit at eye-level with the flames, preserving the ancestral ritual by allowing them to peer directly into the
glowing heart of the installation. Rising from this heated base, four chimneys puncture the horizon, serving the dual purpose of smoke evacuation and structural support for a canopy of standard corrugated metal sheets. This roof serves as a rain-catcher; a gutter guides water into a small, reflective pond at the pavilion’s edge, contrasting the crackle of the fire with the stillness of water and the drift of rising steam.
Constructed with a focus on radical circularity, every component - from the dry-stacked masonry to the industrial metal skin - is designed for easy assembly and future reuse. The Thermal Commons does not just provide a place to sit; it offers a sensory threshold. It is an exploration of how architecture can use low-tech, reclaimed materials to facilitate a «thermal architecture of the soul,» bridging the gap between the raw intensity of the festival and the deep, restorative comfort of the communal hearth.