Understanding EPDs
An EPD is like a nutrition label, but for environmental impacts. Instead of calories and vitamins, it details embodied carbon (Global Warming Potential), energy use, water consumption, and waste generation across a product's life cycle.
EPDs are created using Life Cycle Assessment (LCA) methodology, based on international standards such as ISO 14025, ISO 14040/14044, and EN 15804. By following established Product Category Rules (PCRs), EPDs ensure that products within the same category are evaluated consistently, allowing for fair comparison.
The Life Cycle Approach
A robust EPD evaluates multiple stages of a product's life, typically categorized as:
- Cradle to Gate (A1-A3): Raw material extraction, transport to manufacturing site, and the manufacturing process itself.
- Construction/Installation (A4-A5): Transport to the building site and installation impacts.
- Use Stage (B1-B7): Maintenance, repair, replacement, operational energy, and water use.
- End of Life (C1-C4): Deconstruction, transport to waste processing, recycling/recovery, and disposal.
- Beyond System Boundary (D): Reuse, recovery, or recycling potential.
Why are EPDs Important?
As the construction industry moves towards net-zero carbon goals, transparent environmental data is critical. EPDs allow architects, builders, and developers to:
- Calculate the total carbon footprint of a building.
- Make informed, sustainable procurement decisions.
- Earn credits in leading green building rating tools such as LEED, Green Star, BREEAM, and the WELL Building Standard.
- Avoid greenwashing by relying on independently verified, scientific data.