Congratz. It is too bad in the U.S.A we don't allow "hempcrete" in the building of our dwellings here. R40 insulation value is pretty amazing, but then what would Dupont do with all that fiberglass?!? Have fun pumping bubbles in cement. It does sound fun.
That's interesting! I've heard hempcrete tossed around as a concept but never had time to investigate. Will do.
I'm not clear on the R-value potential for this density of aerated concrete but it's going to be vastly improved compared to normal mixes due to the insulating effect of the entrained air! Thanks for something to think about.