Material passports for construction: Why I see them less as banks… and more as donor registries
From December NZ Manufacturer -Troy Coyle,CEO,HERA Across the infrastructure and construction sectors, material passports are emerging as a promising tool for enabling circularity. They’re often described as a “bank of materials,” and I understand why (in fact HERA even describes them this way). After all, they catalogue the materials embedded within a building so they can be withdrawn at the end of life and reused elsewhere. The more I’ve worked with the concept, the more I’ve found that the banking analogy falls short. In fact, my own conceptualisation has shifted quite significantly: I now see material passports as closer in spirit to a donor organ registry than to a passport or financial ledger. This is because for reuse to work in construction, it’s not enough to know what materials exist. We also need to understand which components are actually compatible with which future projects- this makes it much like donors and recipients in medical systems. This compatibility challenge is where I believe the next evolution of thinking must occur. Why the “Material Bank” analogy isn’t enough Material passports are often framed as banks because they identify valuable materials for future “withdrawal.” The logic is sound: buildings act as repositories of steel, timber, concrete elements, glass, fixtures, and systems that shouldn’t be lost to landfill or downcycling. However, in a bank, all currency of the same denomination is interchangeable. One dollar equals another dollar. Construction materials are not interchangeable in this way. Two steel beams of the same nominal specification may have vastly different histories, including different loading conditions, different environments, different coatings, different compliance requirements. Their future use potential can vary dramatically. This is where the financial metaphor starts to break down for me. Why I think the organ donor registry analogy fits better In my view, material passports need […]
