Looked into building a house out of EPS panels, since it (at first look) looks like a splendid material with built in insulation. However:

1: it loses its integrity around 80-100c causing catastrophic failure on bearing capability

2: it burns literally like any other hydrocarbon, and its foamed construction makes it highly flammable

3: to reduce flammability and adhere to code you need to use EPS with flame retardants - which fuck you up, you're basically building a house out of Frozen gasoline and flame retardants.

so if you want to go this route, take a look at Corkwood instead - comes in large industrial panels and can be used to build houses - been used for 100s of years, doesn't burn - at-all - and contains no nasty shit.

https://eumeps.construction/content/8-downloads/4-documents/...

source of initial inspiration: https://vimeo.com/81180775

cork source: http://www.edisughero.com/en/#prodotti

blocks: https://www.gencork.com/2020/about-us/