Listening to this programme by Maddy Savage:
https://www.bbc.co.uk/programmes/w3ct316s
Which is linked to this article:
https://www.bbc.co.uk/news/business-62798950
It came up with Finnish using a sheet material called "gypsum board" (in the context of cross-laminated timber:
At the upper secondary school, gypsum board, which is made from limestone and not flammable, is used to add an extra layer of protection on the interior walls on higher floors. "We need to take fire safety seriously," says Ms Airaksinen. "We also did a lot of simulation about evacuation and durability in case there will be a fire."
Is this just plasterboard?
The thesis of the programme is about sustainable construction, and it seemed to me to fit the not uncommon BBC pattern of something perfectly common being framed as a worldwide sensation because it is in a foreign country reported by a non-specialist reporter.
F