The question has moved from whether building regulations will cover embodied carbon to when. Several jurisdictions have published timetables. The organisations scrambling are the ones still trying to assemble the data after the tender rather than before it.
What has to be true
You need a product declaration for the glass, one for the frame, one for the spacer, and one for the fixings, and you need them in a format a calculator can read. The glass is usually the easiest. The spacer is usually the blocker.
Start with the bill of materials
Not the carbon — the bill of materials, precisely specified. Almost every organisation we have spoken to already had the information scattered across three systems. The carbon calculation is arithmetic once the data is assembled.
Procurement language
The early movers are writing carbon requirements into tender documents as a performance requirement with a defined data format. That converts an engineering problem into a supply chain question, which is where it belongs.
