I plan on pouring a concrete foundation and then insulate the outside with about 6 inches of foam and maybe foam on the inside of the concrete as well. I figure, essentially, I will have a similar foundation as Lite-form when I'm done. With that much foam on the outside, how do you fasten like concrete siding to the side with that much foam. Another question: If the floors on the inside of the home are wooden like most houses, can you pour concrete on top of that so you could have it stained and cut looking similar to what you see in some stores? Or with the wood floor, would the concrete eventually get big cracks because wood was underneath? Thanks and appreciate very much your advice!

What your explaining is a poured wall converted to a ICF wall without the attachments for your exterior finish. This will cost you much more than ICF when completed, and the gain from 6" of foam will be minimal.

Dave

As far as the wood floors go if they are engineered to carry the load of occupancy along with the concrete you shouldn't have a issue there unless your pouring in a cold climate. If your in a cold climate the floor will heave at the corners and edges once heat is put into the house(expands) and it will crack about 2' from all outside corners as it lays back down.

Dave

There is a balance point or equlibrem in a concrete wall with foam on both sides, as far heat gain or loss through the wall. In most on of North america that wall thickness is 6" with 2.5" of eps foam on each side. In the very North additional foam should be added to the exterior. There are several ICF's built this way. Much cheaper than site built and without all the frustration of no attachments. I am not a big fan of just adding a couple inches of concrete to a engineered wood or steel floor system. With this technique you get only the thermal mass quilatys of concrete and its limited to only 2". You get a lot of dead weight. You get no structural strength or fire protection and the inner icf foam is still a fire raceway to upper levels. I would instead use a cast in place concrete floor system.