>In my opion papercrete would be structural as well as insulation. The factory made
>SIP's made with EPS are no more structural than papercrete would be, its the OSB
> that gives the sandwich its strength, the EPS or the Papercrete fills the void and
>assists with the structural and insulation value of the panels. I don't believe papercrete
> has nearly the insulation value of EPS but in the right mixture I believe it would beat
> EPS in strength, as illustrated by Clair with her bullet test.
There's another component to the strength of the SIP, the bond between the foam and the skin. If that EPS isn't well bonded to the OSB, I would expect it to have very little structural strength. Polyurethane foam can be cast in place, since it is naturally very sticky and expands, but EPS requires glue. That's another reason I wondered whether the PC panels should be made and dried before sticking the skins to them.
I don't know if you've experimented with papercrete poured into place yet, but I'm wondering how well it would bond with your skins. I do know it usually shrinks away from forms people use for making blocks, which would indicate to me that the bond isn't too strong, so I'd be interested to see how your experiments work out.
Greg
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