A development that could sustainably change the European insulation material market: Austrotherm has commissioned a unique recycling facility for expanded polystyrene (EPS) that is one of a kind in Austria. The facility closes the material loop for the first time in Austria for one of the most commonly used insulation materials in building construction. For planners and construction companies, this raises not only the question of technical feasibility, but also of the economics and regulatory implications of such a circular economy in the insulation material industry.
Technical fundamentals: How does EPS recycling work on an industrial scale?
Expanded polystyrene, colloquially often referred to as Styrofoam, is a recycling building material with specific challenges. The bulk density of EPS insulation boards is typically between 15 and 30 kg/m³, which leads to large volumes but low weight in deconstruction projects. The facility commissioned by Austrotherm processes EPS offcuts from its own production as well as demolition material from the construction industry. The process is based on mechanical shredding, cleaning, and subsequent reintegration into the production process.
In contrast to thermal recycling processes where EPS is burned for energy generation, material recycling preserves the molecular structure of polystyrene. This enables the production of new insulation boards with comparable material properties. According to the manufacturer, the lambda value of recycled EPS remains at approximately 0.032 to 0.038 W/(m·K), which meets the requirements for highly efficient building envelopes. Compressive strength and fire behavior according to Euroclass E also remain largely unchanged with proper processing.
Economic dimension: Cost structure and market potential
The economic viability of insulation material recycling depends primarily on three factors: the cost of primary raw materials, disposal costs for EPS waste, and the availability of demolition material. In recent years, the cost of polystyrene granulate as a primary raw material has risen volatilely, making recycled alternatives increasingly attractive. At the same time, regulatory requirements for the landfilling and incineration of EPS are becoming stricter, particularly when it is contaminated with flame retardant additives such as hexabromocyclododecane (HBCD).
This creates several implications for Austrian and European construction companies. First, the availability of certified recycled EPS will influence cost calculations in public procurement, especially when EPD data (Environmental Product Declarations) and CO₂ balances are used as award criteria. Second, Austrotherm's facility could set a precedent for other insulation material manufacturers, similar to what has already happened with ROCKWOOL in the field of mineral wool. The investments by ROCKWOOL in Germany show that capacity expansion and sustainability strategy increasingly go hand in hand.
Regulatory classification: CBAM, waste framework directive and national building codes
The commissioning of the recycling facility comes at a time of intensive regulatory change. With the EU's Carbon Border Adjustment Mechanism (CBAM), CO₂ emissions in the supply chain will become price-relevant for building materials from 2026 onwards. EPS manufacturers that demonstrably use recycling material can significantly improve their CO₂ balance and thus gain competitive advantages. The EU waste framework directive also requires a recycling rate of at least 70% for construction and demolition waste by 2030, which increases pressure on the industry to establish closed material loops.
In Austria and Germany, specific requirements also apply to the recovery of EPS waste. The Austrian landfill ordinance has prohibited the landfilling of untreated EPS since 2009, making material recycling the most economically viable option. In Germany, the Circular Economy Act (KrWG) establishes a five-level waste hierarchy in which reuse and material recycling take precedence over energy recovery. Construction companies that sort EPS insulation materials by type during demolition projects and send them to a recycling facility not only comply with legal requirements but can also reduce disposal costs.
Comparison with other circular systems: Mineral wool, wood fiber and fiber cement
Austrotherm's recycling facility is part of a growing number of initiatives aimed at achieving closed material loops in the building materials industry. Etex and Heidelberg Materials have developed a process in which fiber cement waste serves as a raw material for cement production. STEICO uses wood fiber waste from its own production to manufacture new wood fiber insulation materials, which significantly increases resource efficiency.
Compared to these systems, EPS recycling offers specific advantages: the chemical structure of polystyrene is stable, enabling multiple reuse without significant quality loss. However, type purity is critical: contamination from other plastics, plaster or adhesives can complicate recycling. Planners should therefore select external thermal insulation composite systems (ETICS) based on separable systems in which the insulation layer can be demolished without chemical bonding to the facade.
Implications for construction practice: Planning recommendations and material availability
For architects and structural engineers, the availability of recycled EPS has several practical consequences. First, recycling rates and EPD data should be considered as quality criteria when tendering insulation work. Second, the regional availability of recycling material can influence logistics costs, particularly in Austria and adjacent regions. Third, demolition concepts should be considered in the planning phase to enable the sorted separation of insulation materials at the end of the service life.
Austrotherm's facility could become a model for other manufacturers, similar to how Austrotherm's expansion in Eastern Europe shows that investments in production capacity and sustainability occur in parallel. The integration of circular building principles into corporate strategy is also increasingly becoming a competitive factor, particularly in large projects with strict sustainability requirements according to DGNB or LEED.
Outlook: From Austrian innovation to European standard?
The commissioning of Austrotherm's recycling facility marks an important milestone in the transformation of the insulation material industry. Whether the model will become widespread across Europe depends on several factors: the availability of demolition material, economic viability compared to primary raw materials, and regulatory support from national and European legislation. The coming years will show whether circular building in the insulation material industry will transition from a niche topic to standard practice.
