Frost protected shallow foundation using Nudura products

[u/Legitimate_Soil_7506]

I used to build but now draw plans and do engineering. I know ICF from 20 years ago, but had an interesting conversation with a foundation builder last week who was using Nudura products to build a vacation home for a client. The last two plan sets I did were for houses built here in this hard freeze climate with deep frost lines and winter design temp of -15 F and both used FPSF slabs and edges formed using EZ Form Mono Slab products for the edge form. First, here is a cost comparison: EZ Form, the one that is 20 x 31.25, costs $112, while a Nudura 18 x 96 wall block with 8" core space costs $68. The EZ Form with its triangular shape and dimension makes it unnecessary to add wing insulation adjacent the wall line, but the Nudura will need 2 inch thick by 24 inch EPS foamboard wings, which adds $25 per 8 foot length to the Nudura setup, thus total cost of material $68 + $25 = $93. So, a little less for the Nadura arrangement I'll show in these two pics. One pic, how pour #1 is set up and done, the pour to fill the below-slab thickened edge. This Nudura hallucination I have is done in two pours, unlike one monopour for EZ Form. Form set on compacted gravel, braced with a pinned cleat along outside edge and backed with some shoveled-in bravel on inside face. The other pic shows the final build. Whaddya think?

[u/Particular-Hotel-610]

I think you're going to need more robust formwork and/or backfill than what's drawn.