Energy-Efficiet Balcony-Wall Connection Through a Novel Thermal Break Block Incorporating Recycled Plastic Waste

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Thermal bridges at cantilever balcony connections remain one of the most critical sources of heat loss in modern buildings. Conventional reinforced concrete balconies create a continuous conductive path between interior and exterior environments, increasing heating demand, surface condensation risk, and greenhouse gas emissions. This study presents an innovative structural-thermal solution based on a recycled plastic composite block integrated within the balcony-wall connection zone. Experimental investigations and mathematical modeling were employed to evaluate thermal conductivity, air permeability, and potential energy savings. Results indicate that the proposed system significantly reduces heat transfer while maintaining adequate structural performance. The developed solution contributes simultaneously to building decarbonization and plastic waste recycling objectives, supporting European Green Deal and EPBD requirements.