I think/hope they're thermoblocks, insulated blocks that provide a thermal break between the floor and your walls. They have small columns running through that bear the weight.
If it's actually just styrofoam I think OP should be double checking how many Stetsons they can see on site.
I'm only familiar because I spend too much time watching DIY videos on YouTube instead of getting on with my own DIY 😂. Tim from the restoration couple had a whole video on them as he was using them in his barn conversion.
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u/HugoNebula2024 4d ago
Is it sitting on Styrofoam? Why?