Sustainability Report

The design for reducing the project's embodied carbon footprint was a comprehensive strategy focused on material sourcing, reuse, and modular construction. Key elements include:

• Reused Materials: The foundation and basement of the former building were incorporated into the new structure. The slatted ceiling from the old town hall was reused, and existing furniture was reupholstered for a new life.

• Local and Bio-based Materials: The architects prioritized local sourcing to reduce transportation emissions. This includes beech wood from a nearby estate for interior paneling, stairs, and furniture; brick made from local Gelderland clay; and a tapestry woven from wool from local Rheden sheep.

• Dry-Stack Brick Facade: Bricks are mechanically stacked and grouted, not mortared, allowing full dismantling and reuse.

• CLT Atrium Roof: Sawtooth roof structure in CLT reduces embodied emissions compared to concrete/steel alternatives.

The building was designed to be energy neutral through a combination of passive and active systems:

• Compact Design: The new building is 2,000 square meters smaller than its predecessor, which inherently reduces its energy needs. Its optimal balance of open and closed areas, combined with a compact form, minimizes heat loss and gain.

• Ice Buffer: The building uses an innovative ice buffer system for energy storage. This system works in conjunction with a heat pump and a heat absorber, efficiently providing both heating and cooling.

• Biophilic Design: The atrium functions as a "green lung" with climbing plants, which contribute to a healthier indoor climate and reduce the need for mechanical ventilation.

• Energy Neutral Building: Achieved through a combination of Solar PV (142,560 Wp), an ice buffer thermal storage system, and heat pump integration.

• Optimized Solar Orientation: North-facing shed roofs and south facades equipped with sun blinds and screen-printed glazing.

• Green Roofs: Provide insulation, reduce heat island effect, and support biodiversity.

The project's focus on circularity and durability extends to its service and maintenance strategies. The design's reliance on materials that can be easily accessed and maintained contributes to long-term efficiency. The use of robust, high-quality materials such as dry-stacked bricks and CLT reduces the need for frequent replacement, thereby minimizing the emissions associated with ongoing maintenance:

• Separation of Shell and Interior: Modular grid, generous floor heights, and flexible interior allow adaptation without structural intervention.

• Durable Material Choices: Locally sourced beech, reusable furniture, reupholstered fittings, and natural wool finishes reduce future replacement needs.

• Landscape as Low-Maintenance System: Plantings mimic natural ecosystems (forest edge, meadow, heath), requiring minimal irrigation or intervention.

• Circular Detailing: Dry-stack brickwork, removable panels, and modular ceiling systems simplify maintenance and replacement.