SigmaRoc

Sustainability

Sustainability is a key priority for Ronez. In alignment with the UK Government’s pledge to achieve net zero carbon emissions by 2050, we are committed to playing our part by supplying low carbon ready-mix concrete as standard, in fact we have been producing low carbon concrete since 2009.

As market leaders, we understand the importance of our role in supporting Jersey’s carbon reduction strategy, this responsibility extends beyond the embodied carbon in our products to how we operate—efficiently, responsibly, and with environmental awareness. We are also proud to have been part of the ECO-Active scheme since its inception and have received consecutive construction awards for our innovative and environmentally conscious practices.

To significantly reduce emissions, we’ve incorporated Ground Granulated Blast-furnace Slag (GGBS) into our production process. GGBS is a by-product of steel manufacturing and is widely recognised as one of the most sustainable construction materials available.

Environmental & Performance Benefits of GGBS

  • Lower carbon footprint:
  •   - Cement production generates ~860 kg CO₂e per tonne.
  •   - GGBS produces significantly less, at 350–594 kg CO₂e per tonne.
  • Durability & Quality: GGBS enhances concrete’s resistance to aggressive environments.

Our Commitment in Practice

  • All standard concrete mixes contain ~50% GGBS, making them low carbon by default.
  • For specialised applications, we offer up to 80% GGBS blends (CEM III/B).

We also provide Product Carbon Footprints (PCFs) for all our concrete mixes. PCFs measure the total greenhouse gas emissions associated with a product’s life cycle, typically expressed as kg CO₂e per cubic metre. This transparency helps our customers meet their own sustainability goals and regulatory reporting requirements.

In summary, operating our business in a sustainable way is at the forefront of our minds and we want to stand with our customers by offering high quality ready-mix concrete and concrete products, without compromising on making the right choice for the planet.