Sustainability Report

Embodied carbon overview

• The structural system is shaped by complex hydrogeological conditions, which required a reinforced concrete grid supported by large-diameter piles and cast-in-place reinforced concrete for the subgrade. These elements were essential where the basement transitions to non-basement areas — here, watertight concrete with integrated waterproofing was necessary to resist pressurised groundwater.
• Above ground, 300-millimetre precision ceramic blocks form the load-bearing walls. The use of ceramic blocks in the superstructure helps reduce the quantity of reinforced concrete required. 
• Internal load-bearing and partition walls are constructed from thermally efficient blockwork and the lift shaft uses permanent formwork with reinforcement. 
• Monolithic reinforced concrete slabs are paired with exposed ribbed concrete ceilings fitted with Heraklith® wood-wool acoustic panels. Heraklith acoustic panels introduce a lower-carbon alternative to dense acoustic systems.
• The ventilated timber cladding is made of thermally modified pine (ThermoWood®). As a renewable and long-lasting material, ThermoWood typically has a lower embodied carbon profile and stores biogenic carbon.
• While the project was not explicitly framed around carbon minimisation, the architects worked closely with the kindergarten’s director and staff to refine operations and avoid unnecessary programme inflation. This collaborative approach can indirectly reduce embodied carbon by preventing overbuilding.

Operational emissions overview

• The kindergarten achieves an energy-efficient Class A rating. Heating is delivered through low-temperature underfloor systems supported by a 40 kW air-to-water heat pump, which also provides cooling and mechanical ventilation. The building is fully electrified and independent of gas.
• Indoor air quality is maintained through mechanical ventilation with heat recovery. Where natural ventilation is not feasible, such as kitchens and bathrooms, forced extraction is used.
• Daylighting is maximised, with every classroom lit from three sides and from roof skylights, reducing demand for artificial lighting.
• Stormwater is managed through two retention tanks with a combined capacity of 24 cubic metres; there is also controlled overflow to the public rainwater drainage system.
• The extensive green roof build-up further enhances durability and supports biodiversity.

Durable materials such as thermally modified pine extend the life of the facade and reduce maintenance cycles.