Austrian insulation manufacturer Austrotherm is increasingly positioning itself in the circular economy segment. The focus is on XPS boards with recycled content, in-house take-back systems for production waste and construction site offcuts, as well as EPD documentation for circular building materials. While the industry is increasingly relying on circular building, technical and logistical hurdles remain for extruded polystyrene.
Product line: XPS recycled material and take-back models
Austrotherm offers primarily XPS insulation boards with in-house recycled production waste in its circular economy range. The recycled content is up to 30% according to the manufacturer – offcuts from own production are granulated and fed back into the extrusion process. This is technically much more practical for XPS than for EPS, since the closed-cell structure is less sensitive to foreign particles. The thermal conductivity of the XPS boards ranges between λ = 0.032 and 0.036 W/(m·K) depending on product type, and the compressive strength for standard perimeter applications is at least 300 kPa (CC(10/Y)300). These values comply with DIN EN 13164 and are in line with industry standards.
Austrotherm also operates a take-back system for sorted XPS offcuts from construction sites. The requirement is material purity: no contamination, no composite constructions, no bonding with bitumen or PUR foam. In practice, the return rate remains low because the logistics – particularly for small quantities – are complex, and many offcuts are already disposed of on the construction site as EAK 17 02 03 (plastic). The manufacturer states that returned material flows back into production to at least 80%; the remainder is thermally recovered.
Top products and applications
The two central products in the circular economy segment are Austrotherm XPS TOP Recycled (perimeter insulation, earth-contact components) and Austrotherm XPS PLUS Recycled (flat roof, below the waterproofing membrane). Both meet fire class E according to EN 13501-1 – sufficient for earth-contact applications, but not compliant with the requirements for non-combustible insulation materials (A1/A2) for façades. The bulk density is approximately 32–38 kg/m³, and long-term water absorption (WL(T)) is below 0.7 vol.%. These values make XPS particularly suitable for plinth and perimeter insulation, as it is also used in timber construction applications.
Thicknesses range from 30 to 300 mm, and board formats are standardized (1250 × 600 mm). Austrotherm supplies the boards with continuous step-and-tongue edge (SF) or straight edge (GK), depending on structural requirements and installation method. For flat roof constructions, the boards are certified with declaration for long-term compressive load (DLT(2)5) – relevant for extensive roof greening.
Market position and competitive comparison
In the DACH region, Austrotherm competes in the XPS segment with Knauf (Knauf XTherm), BASF (Styrodur, under new license since 2021) and various regional providers. Market shares are not published by manufacturers; industry estimates suggest a mid single-digit percentage range for Austrotherm in Germany, while Knauf and BASF serve significantly larger volumes. Austrotherm is more strongly positioned in its home market of Austria. Differentiation is achieved through EPD documentation: Austrotherm provides EPDs in accordance with EN 15804+A2 for its recycled material lines, which transparently disclose biogenic carbon and end-of-life scenarios. This documentation is increasingly required for DGNB and LEED certifications.
Competitors such as ROCKWOOL or ISOVER are focusing on mineral wool with high recycled content (up to 84% for ISOVER) in their circular economy strategies, which is also fully recyclable at the factory. The advantage of stone wool lies in non-combustibility (A1) and higher acceptance in façade systems. However, XPS remains without direct alternative in perimeter and green roof applications due to its moisture resistance.
Current developments and product announcements
Austrotherm announced in 2023 that it would gradually increase the recycled content in XPS boards to up to 40%. This requires improved sorting and processing technologies, as post-consumer recycled material (PCR) from demolition is significantly more heterogeneous than production waste. In parallel, work is underway on chemical recycling: polystyrene is broken down into its monomers (styrene) and can theoretically be fed back into plastic production at 100%. However, these processes are still in pilot phases and are energy-intensive.
Additionally, Austrotherm is expanding its logistics network: regional collection points for construction site offcuts are being established in Austria and southern Germany to increase return quantities. A concrete new product was not recently communicated; the focus is on scaling existing recycled material lines and updating EPDs in accordance with GEG 2024 (grey emissions accounting). The next relevant product generation is expected in 2025, once chemical recycling becomes industrially available.
Conclusion: Technical feasibility vs. logistical reality
Austrotherm has a solid, though still expandable, position in the circular economy segment. The XPS recycled material lines technically meet all standards and offer EPD transparency. The challenge lies less in material technology than in return logistics: today, construction site offcuts are mostly thermally recovered, not recycled materially. For true circular economy, there is a lack of widespread take-back systems and economic incentives for sorted separation. Compared to insulation materials such as mineral wool or wood fiber insulation, XPS remains a niche product in terms of circular capability – technically mature, but not yet scaled logistically.
