The dataset was filled with existing data from NIBE and Holland Houtland and expanded to include new materials and new impact categories. In the absence of nationally recognized frameworks for specific materials, desk-research was used to ascertain which data source is most appropriate, also considering EU (EN-norm based) data. All data sources were recorded and entered into the database for reference. The data of the building materials are stored and structured in this google sheet which is available for public use.
We’ve performed meta analyses of hard and soft data points from nationally recognized bodies to use as input for the tool. NIBE, Stichting Nationale Koolstofmarkt (SNK), ASN Bank and TNO engaged in the project to help validate our data.