Foam-free shallow frost-protected slab Ideas
I am considering a shallow frost slab for a new construction 5000 sf (first floor) home in North-West Connecticut (Climate Zone 5b).
I would like to avoid as much foam as possible. Has anyone built a greener version of a shallow frost slab that avoids foam insulation? I know of a
I am thinking about using Foamglas for the perimeter/footing and exterior “wing” https://www.owenscorning.com/insulation/foamglas and Glavel for both gravel below the installation and insulation for the entire slab.
Rockwool would be another option (https://www.greenbuildingadvisor.com/article/sub-slab-mineral-wool), but I am very intrigued by Glavel as both sub-slab drainage and insulation.
I have seen ads for https://nexcembuild.com/icf-wall-forms/ (just after I posted this question) – maybe that would be an idea, especially since the project has a small basement (for mechanical & storage). So we have to combine slab with basement installation.
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