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Insulation question regarding compression strength

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  • trezno
    replied
    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.

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  • david s
    replied
    Click image for larger version

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ID:	421972 Given that a 10:1 vermicrete is considered inadequate and a 5:1 about right then the min would be around 150 psi.

    Last edited by david s; 05-02-2020, 04:35 PM.

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  • UtahBeehiver
    replied
    75 psi or about 517 kPa at 5% compression

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  • trezno
    started a topic Insulation question regarding compression strength

    Insulation question regarding compression strength

    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?
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