Insulation question regarding compression strength

[trezno]

I'm soon pouring the base so I’m planning ahead and sourcing materials for the rest of the build. On the insulation below dome, I have a question about compression strength.

I have found this calcium silicate board multipor: https://www.multipor.com/Multipor_mi...n_board_EN.pdf
It has a compression strength (compressive resistance) ranging from 200 kPa to 350 kPa. I could compress the material with my fingers easily!
From my calculations my dome’s footprint will be about 0.2 kg/cm2 (90 cm diameter) and 200 kPa equals 2 kg/cm2. So I should be on the safe side with a factor 10??

What is the consensus on minimum strength required from insulation boards?

[UtahBeehiver]

75 psi or about 517 kPa at 5% compression

[david s]

Given that a 10:1 vermicrete is considered inadequate and a 5:1 about right then the min would be around 150 psi.

[trezno]

I found another calcium silicate board, skamowall, with 2800 kPa, about 406 psi. It has similar insulating properties. That should be a better solution then.

Here a picture of my progress so far. Getting ready to pour foundation today.