RE4 · Project

Prefabricated Building Elements Made from 65% Recycled Demolition Waste

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When we tear down old buildings, most of the rubble ends up in landfills. RE4 figured out how to turn that demolition waste — concrete chunks, old insulation, broken ceramics — back into ready-to-use prefabricated wall panels and building blocks. Think of it like IKEA for construction, but made from recycled ruins. These new panels snap together easily, save energy, and when the building's life is over, they can be taken apart and reused again.

By the numbers

65%

Maximum recycled CDW content by weight in prefabricated elements

50%

Medium replacement rate for mineral fraction in concrete

80-90%

Reusable structure rate for RE4-prefabricated building concept

15-20%

Reusable structure rate for existing renovated buildings

Consortium partners across 8 countries

Total project deliverables completed

Physical demonstrators built (mock-up, refurbishment, production)

The business problem

What needed solving

Construction generates roughly a third of Europe's total waste, and most demolition rubble gets downcycled into road fill or dumped in landfills. Meanwhile, builders keep buying virgin raw materials at rising prices while facing tighter EU waste regulations. Companies need a proven way to turn demolition waste into certified, energy-efficient building products — not just crushed aggregate, but actual wall panels and structural elements.

The solution

What was built

RE4 produced prefabricated building panels and blocks containing up to 65% recycled construction and demolition waste. They built three physical demonstrators: a mock-up for new construction, a façade refurbishment installation on an existing building, and an industrial production line test with characterised samples. The project delivered 35 deliverables including LCA/LCC analyses, certification procedures, and business plans.

Audience

Who needs this

Prefabricated panel and modular building manufacturers looking for cheaper, greener raw materialsConstruction and demolition waste processors seeking higher-value recycling outputsFaçade renovation contractors needing affordable energy-efficient retrofit solutionsProperty developers under pressure to meet circular economy requirementsBuilding material companies wanting to add recycled product lines

Business applications

Who can put this to work

Prefabricated Construction

mid-size

Target: Prefab panel and modular building manufacturers

If you are a prefab manufacturer dealing with rising raw material costs and tightening waste regulations — RE4 developed concrete and insulation panels containing up to 65% recycled construction and demolition waste by weight. These elements were produced and tested in industrial conditions, with mock-ups built for both new construction and refurbishment. The panels are designed for easy assembly and disassembly, meaning your products become reusable at end of life.

Demolition & Waste Management

SME

Target: Construction and demolition waste processors

If you are a CDW waste processor looking for higher-value outputs beyond crushed aggregate — RE4 demonstrated how to convert demolition waste into certified building materials including geopolymer binders and insulating panels. The project covered the full chain from waste sorting to prefabricated element production, tested with LCA and LCC analyses. This turns your waste stream into a product stream with proven specifications.

Building Renovation

SME

Target: Façade renovation and energy retrofit contractors

If you are a renovation contractor struggling with the cost and complexity of energy-efficient refurbishment — RE4 built and demonstrated façade panels made from recycled materials that can be installed on existing buildings. The refurbishment demonstrator proved that prefabricated recycled panels can be mounted on existing façades. Structures in renovated buildings can achieve 15-20% reusability at end of life.

Frequently asked

Quick answers

What does it cost to produce these recycled prefab elements compared to conventional ones?

The project included Life Cycle Cost (LCC) analyses as part of its technical activities, which would detail cost comparisons. Based on available project data, specific per-unit costs are not published in the objective, but using up to 65% recycled material by weight should reduce raw material purchasing costs significantly.

Can these recycled panels be produced at industrial scale?

Yes. The project explicitly targeted demonstration of building elements produced from CDW in an industrial environment. The deliverables include prefabricated elements production and testing, with elements produced in quantity sufficient to build prototypes. With 9 industry partners and 7 SMEs in the consortium, the path from lab to factory was built into the project.

Who owns the intellectual property and how can I license it?

The IP is held by the 18-partner consortium led by Centro di Ricerche Europeo di Tecnologie Design e Materiali in Italy. The project included commercialisation and exploitation strategy definition along with business modelling and business plans. Licensing discussions would need to go through the coordinator or relevant consortium partners.

Do these recycled materials meet building codes and certification requirements?

The project specifically included certification and standardization procedures as core activities. The prefabricated elements went through characterization and testing. However, specific certifications obtained would depend on the target market and national building regulations.

How long did development and testing take, and is this ready to deploy?

The project ran from September 2016 to February 2020 — three and a half years of development. They completed mock-ups for new construction, refurbishment demonstrators with façade panel installation, and industrial-scale production testing. The technology has been demonstrated but would need market-specific adaptation.

Can these panels integrate with standard construction methods and existing buildings?

Yes, the project specifically addressed both new construction and refurbishment of existing buildings. The refurbishment demonstrator proved that panels can be installed on existing façades. The design concept emphasizes easy assembly and disassembly, making integration with current building practices practical.

Consortium

Who built it

The RE4 consortium is unusually well-balanced for commercialisation. With 9 industry partners (50% of the consortium) and 7 SMEs, this is not an ivory-tower research project — it was built with manufacturers and builders at the table. The 18 partners span 8 countries (Belgium, Czech Republic, Germany, Spain, Italy, Sweden, Taiwan, and the UK), giving the technology exposure to diverse building codes and construction markets. The coordinator is an Italian research centre specialising in materials and design technologies. The mix of 3 universities and 5 research organisations provided the science, while the industry half ensured the results could actually be manufactured and installed on real buildings.

CENTRO DI RICERCHE EUROPEO DI TECNOLOGIE DESIGN E MATERIALICoordinator · IT
ZRS ARCHITEKTEN GESELLSCHAFT VONARCHITEKTEN MBHparticipant · DE
RISE CBI Betonginstitutet ABparticipant · SE
ASSOCIATION OF CITIES AND REGIONS FOR SUSTAINABLE RESOURCE MANAGEMENTparticipant · BE
RISE RESEARCH INSTITUTES OF SWEDEN ABparticipant · SE
RINA CONSULTING SPAthirdparty · IT
THE QUEEN'S UNIVERSITY OF BELFASTparticipant · UK
CONSIGLIO NAZIONALE DELLE RICERCHEthirdparty · IT
SVILUPPO TECNOLOGIE E RICERCA PER L'EDILIZIA SISMICAMENTE SICURA ED ECOSOSTENIBILE SCARLparticipant · IT
UNIVERSITA DEGLI STUDI DEL SANNIOthirdparty · IT
FENIX TNT SROparticipant · CZ
ACCIONA CONSTRUCCION SAparticipant · ES
STAM SRLparticipant · IT
STAMTECH SRLparticipant · IT

How to reach the team

Centro di Ricerche Europeo di Tecnologie Design e Materiali (Italy) — contact via project website or SciTransfer introduction

Order a report on this consortium See CENTRO DI RICERCHE EUROPEO DI TECNOLOGIE DESIGN E MATERIALI profile →

Next steps

Talk to the team behind this work.

Want to explore licensing RE4 technology for your prefab production line or renovation projects? SciTransfer can arrange a direct introduction to the right consortium partner for your market.

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