The tiny amount of insulation used in the US building industry is amazing from a European perspective.
In Europe nobody would consider putting less than 150mm of PUR insulation beneath a heated slab and even unheated, most of that would be required just to meet building regulations.
Our own standards took a long time to get to this level as the construction industry is conservative and slow to change.
Why not learn from our mistakes and start insulating to a high standard?
Surely foam is cheap?
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