@SustainableTall Presumably this figure is achieved using fossil fuel-based materials which themselves have a fairly large carbon footprint. My guesstimate is we could achieve a 10 to 30% high saving if nature-based materials such as wood fibre insulation were used. BUT no figures seem to exist.

🐦🔗: https://n.respublicae.eu/PaulBrannenNE/status/1602243795130748928