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Both problems were addressed in follow-up actions. First, in a letter
to the government we requested help resolving all the constraints
that the teams had encountered until that moment. We thus asked
for:
• Clear rules on how to attribute CO 2
reduction over the concrete
chain;
• Common guidelines for commissioning parties on circular
demolition and attribution of environmental impact;
• Strict application standards for contaminated concrete;
• More flexibility in the use of specific quality standards (e.g. EN
206) depending on the particular concrete application;
• Transparent comparison of different building materials (e.g.
wood, steel and concrete) on environmental performance;
• Financial support for innovation and development of tools.
Since the national government had also signed the agreement, the
three participating ministries were part of solving these problems.
For the second challenge, we needed to address approaches
higher on the circularity ladder: refuse, reduce, redesign
and reuse. These had been addressed by the circular design
team in their construction value model (in Dutch known as ‘de
bouwwaardemodel’), but during our webinar we concluded that
the model needed more specification and had to be used in the
other teams’ roadmaps.