The Fibre Walls Wool project is a continuation of Belén’s ongoing research, developed in collaboration with Kvadrat’s Rethink initiative—a program that invites designers to explore innovative approaches to textile and material processes. Traditionally, acoustics, insulation, texture, and colour are treated as separate elements in construction. Fibre Walls challenges this convention by creating a mono-material that merges—and in some cases omits—layers while maintaining or even enhancing performance. This stucco, developed in collaboration with Huis Veendam, uses leftovers from textile and agricultural industries (such as cellulose or wool fibers) combined with specially developed bio-based binders, offering a sustainable alternative to petrochemical-based products. Importantly, this ensures that the material is 100% biodegradable.

The wool sourced for this project comes from Kvadrat’s largest waste stream, consisting of black and white wool fibers. By playing with ratios of dark grey and off-white wool, we developed a range of textures with unique aesthetic and soundproofing qualities. For instance, soft single-colour applications can evoke the subtle elegance of lime-washed walls, while high-contrast designs mimic the dramatic veining of marble. This material’s adaptability goes further—its application tchnique allows for a painterly approach, as demonstrated in the Willibrordus Kerk project, where it was applied as a textured drawing. This effect provides an innovative alternative to traditional murals or wallpaper, offering both artistic expression and practical benefits like thermal insulation and acoustic dampening.

Currently, Fibre Walls is available in three main varieties: Wool Stucco, Cotton Stucco, and Cotton Spray. They each have their own unique characteristics and appearances. Belen's and Kvadrat’s proof of concept ensure a wall covering that is 100% biodegradable.