posted on Dec, 15 2015 @ 02:13 PM
I, for one, would strap the interior of the exterior walls, simply for future considerations. Everything is designed to be mounted inside a
traditionally framed wall. Strapping the interior allows you to use all of those easily obtained (and cheaper) components, and also allows you to
modify/repair easily and efficiently.
It is nice to have all of the utilities built right in, but when you need to fix or modify...there is nothing quite as easy as a traditionally framed
wall, sheathed in drywall.
If this was mine, it would be 8" ICF, with an additional 2x4 interior. 12" overall wall depth. I would infill the 2x4 wall with a compatible (to the
ICF) closed cell spray foam (1" expanded depth). Install all utilities, and follow that up with a blown cellulose infill, held in place by a radiant
barrier, inset 1/2" from the drywall.