Nudura ICFs are built from 2 expanded polystyrene (EPS) foam panels bonded on either side of a reinforced concrete core, joined by high-density plastic (polypropylene) webs, engineered as a stud.  The standard Nudura ICF block is 8 feet (96") long × 18" tall, with webs (studs) spaced 8" on center.  Foam panel thickness is typically about 2 5⁄8" each side for the standard forms, making the overall wall width vary depending on the core size (for example: 4" core ≈ 9¼" width total; 6" core ≈ 11¼"; 8" core ≈13¼"; up to 12" core ≈17¼"). 
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Core widths are available from 4" to 12" (≈ 102 ‐ 305 mm) depending on load, insulation, or structural requirements. Standard insulation (R-value) for the typical ICF Series is around R-24, and with thicker EPS options (Plus Series) R-values can go as high as R-48. All forms include full-height fastening strips along the webs (studs) so that finishes (drywall, siding, etc.) can be screwed in cleanly and form compression during concrete pour is minimized.

Additionally you may choose to build using steel framing & trusses, an eco-friendly, flood and fire-proof method of construction. 

Nudura.com/products/icf-series