Future resource use at end-of-life of SMET Mortar Products

Key ESG & Circular Economy Considerations – Mortar Materials

Recycling Matrix – Gypsum, Cement & Lime-Based Mortars | SMET

Best Practice: Segregate materials on-site, keep dry, avoid contamination, and prioritise reuse before recycling.

1. Segregation is Critical

Achieving high recycling rates depends on effective segregation of gypsum, cement, and lime-based materials at source. Mixed waste streams significantly reduce recyclability and increase disposal costs.

2. Closed-Loop Potential

Gypsum-based materials offer the strongest circular economy potential, as they can be recycled back into new gypsum products. Lime-based mortars also support circularity, particularly in heritage and breathable construction. Cement-based mortars are typically downcycled rather than fully recycled.

3. Carbon Impact

Cement-based mortars have the highest embodied carbon due to clinker production. Gypsum and lime materials offer lower-carbon recovery pathways, contributing to emissions reduction strategies.

4. Regulatory Compliance

In the UK and EU, gypsum disposal to landfill is restricted due to hydrogen sulphide risks. Construction waste must be classified under the European Waste Catalogue (EWC), and increasing regulatory pressure requires recovery rates of at least 70% for construction and demolition waste.

5. Resource Efficiency

Minimising waste generation through accurate material estimation, proper storage, and supplier take-back schemes improves resource efficiency and reduces environmental impact.

6. Stakeholder Responsibility

Suppliers, contractors, and clients all play a role in ensuring sustainable material use, waste handling, and compliance with ESG commitments.