Reuse of Sandwich Panels: From Circular Ambition to Technical Feasibility
- digimatria
- Mar 3
- 2 min read
Steel-faced sandwich panels are widely used in façades and roofs of industrial and logistics buildings. Despite their high embedded value, most of these elements are discarded when buildings are adapted or renovated.
The central question of our study was simple:
What is required to make sandwich panel reuse viable at scale?
🔗 Read the full paper (MDPI): https://www.mdpi.com/2071-1050/18/5/2454
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Urban Metabolism and Circular Opportunity
From an urban metabolism perspective, we analysed the installed stock of sandwich panels in Portugal, Spain, and France. The results indicate a significant volume of material approaching the end of its first service cycle.
In theory, these panels are strong candidates for the circular economy:
they are modular
they contain a high steel content
many replacements occur before technical failure
In practice, however, reuse remains limited due to:
dismantling damage
lack of condition data
technical and liability uncertainty
The core issue is lack of trust in the secondary market.
An Integrated Approach
To address this challenge, we developed a workflow combining:
controlled façade recovery
UAV inspection
deep learning–based damage detection
BIM-linked material passports
LCC and LCA analysis
The objective was to transform dismantled panels into technically verifiable assets.
Handling Strategy Matters
One of the most relevant findings was the comparison between two dismantling strategies.
The integrated lifting system showed:
five times more mechanical damage
longer operational times
higher control complexity
This demonstrates that circularity starts on site: recovery quality strongly depends on handling logic.
UAV Inspection and Damage Quantification
A UAV-based inspection system combined with Mask R-CNN segmentation was implemented to detect and localise defects.
The method enabled:
3D damage mapping
affected area quantification
panel-level attribution of results
In the pilot, 4,845.90 cm² of mechanical damage were identified across 10 panels.
More important than the absolute value was the creation of auditable and comparable condition data.
Material Passport: From Scrap to Asset
Inspection outputs were integrated into a BIM-linked digital material passport.
Each panel includes:
declared product properties
condition indicators
environmental metrics (GWP)
reuse decision support
This approach directly reduces the information asymmetry that currently blocks the market.
What the Market Says
The stakeholder study revealed a clear pattern:
high risk aversion
preference for certified solutions
price alone does not unlock reuse
The conclusion is unequivocal:
Without verifiable technical data, there will be no robust second-hand market.
Conclusion
The reuse of sandwich panels is technically feasible, but it requires more than good intentions. It demands:
high-quality recovery
robust digital inspection
interoperable material passports
market trust frameworks
The combination of UAV, deep learning, and BIM demonstrates a viable pathway to transform potential waste into circular resources.
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