Circular Reno: Unlocking the potential of biobased insulation in Wallonia

The transition towards sustainable construction practices is an essential step in addressing the global climate crisis. Wallonia, the Belgian region, is spearheading this movement through the Energiesprong Circular Reno programme, which aims to promote energy-efficient retrofits using locally produced biobased and circular building products. 

Despite some scepticism regarding the feasibility and cost-effectiveness of local biobased value chains, recent research by Eco Cluster-construction, a partner in the Circular Reno initiative, highlights a positive outlook for the deployment of biobased insulation in Wallonia.

The Need for Biobased Insulation

In line with international climate targets, Wallonia aims to reduce its greenhouse gas emissions by 80-95% by 2050 compared to 1990 levels. A key component of this strategy is the energy-efficient retrofitting of residential buildings. According to the Walloon long-term energy retrofit strategy, 66% of walls and 48% of roofs in residential buildings in Wallonia do not meet the region’s insulation standards. This significant retrofit need presents a prime opportunity for biobased insulation products.

“Locally produced biobased materials are key to Wallonia’s 2050 greenhouse gas reduction goals.”

Quantifying the Need

To achieve the region’s ambitious targets, extensive retrofits are necessary. Based on detailed analyses and assumptions derived from Statbel statistics, socio-economic surveys, and long-term energy strategies, Wallonia will need to insulate approximately 5,890,000 square metres of wall surface annually up until 2050. This translates into nearly 1.5 million cubic metres of biobased insulation per year. The primary biobased materials being considered include cellulose wadding, grass, lime-hemp mix, and sheep’s wool.

“Wallonia needs 1.5 million cubic metres of biobased insulation annually.”

Production Capacity and Potential

The current production levels of biobased insulation in Wallonia are promising. As of 2023, local producers can supply 615,000 cubic metres of insulation, covering 42% of the annual retrofit needs. These companies have the capacity to increase production to meet over 85% of the demand. Additionally, Wallonia produces more than 1 million cubic metres of structural timber annually, a portion of which can be redirected from exports to meet local construction needs without adversely affecting the timber industry.

“Local producers can meet over 85% of insulation demand with biobased materials.”

Benefits of Biobased Insulation

Biobased insulation offers numerous benefits beyond energy efficiency. These materials are known for their ability to regulate humidity, low levels of volatile organic compounds (VOCs), and an absence of plasticizers and solvents, contributing to healthier indoor environments. As we spend a significant amount of time indoors, improving indoor air quality is crucial for the well-being of occupants.

Addressing Challenges

Despite the clear advantages, several challenges hinder the widespread adoption of biobased insulation:

1. Resistance to Change: There is a notable resistance to change among stakeholders, including architects and construction companies, who may lack knowledge about biobased materials. Education and demonstration projects are essential to overcoming this barrier.

• Cost Concerns: Biobased insulation is often perceived as more expensive due to current production scales. However, increased production and governmental incentives can help reduce costs.

• Urban Planning Regulations: The additional thickness of external insulation can conflict with urban planning standards. Adaptations to regulations are necessary to accommodate the use of biobased materials.

“Educational initiatives and incentives can boost biobased material adoption.”

Encouraging Adoption

To foster the adoption of biobased insulation, a multifaceted approach is necessary. This includes:

• Educational Initiatives: Increasing awareness and knowledge among architects, builders, and the general public about the benefits and implementation of biobased materials.
• Government Incentives: Increasing financial support for retrofits using biobased materials, such as the Walloon Region’s plan to increase premiums for eco-materials.
• Regulatory Adaptations: Modifying urban planning regulations to allow for the additional thickness of biobased insulation materials.

Conclusion

The research by Eco Cluster-construction underscores the feasibility and benefits of using biobased insulation for energy-efficient retrofits in Wallonia. With adequate support and adaptation, biobased materials can play a pivotal role in achieving the region’s climate targets. The positive business case for local biobased value chains not only promotes environmental sustainability, but also boosts local economies by reducing reliance on imported materials and supporting local industries.

Cluster Eco Construction, in collaboration with Valbiom and Filière Bois Wallonie, has produced comprehensive research detailing the opportunities for biobased insulation in Wallonia. Read the full research paper here.

Wallonia stands as a model for other regions in Northwest Europe, demonstrating that with the right strategies, biobased insulation can significantly contribute to sustainable construction practices and help combat climate change.

“Biobased insulation supports Wallonia’s climate targets and boosts local economies.”

Energiesprong & Circular Reno

Energiesprong is a revolutionary approach to sustainable building retrofits, aiming to create net-zero energy homes. The Circular Reno project, which forms part of this initiative, focuses on using biobased and circular materials for retrofits, enhancing environmental and economic benefits. Supported by the Interreg NWE programme, which fosters transnational cooperation to address regional challenges, Circular Reno exemplifies innovation in sustainable construction. Cluster Eco Construction, a valued partner in the Circular Reno programme, has significantly contributed with their research and efforts to analyse and boost the market. This collaboration highlights the potential for large-scale, eco-friendly retrofits, setting a precedent for future projects across Europe.