Your exterior finish will most likely be stucko as you will find it difficult to get a warranty for different sidings, it's the go to finish with this system. There is a lot's of promises with this system but it has not delivered very well in the practical world. Also, in order to really use the concrete as a thermal mass, you can't sandwich it in between insulation.
That's what I'm finding. Still would like to have metal sidings. As far as thermal mass, I agree the best would be bare side but 2-4 inches to the inside vs 4-8 inches on the outside the effect will propagate inwards.
Another "issue" concrete pouring is far from being the specialty of the Quebec construction business when it comes to small residential building. If your walls are poorly poured, it's not fixable so the idea that this type of construction minimizes potential errors... meh.
You can specify the concrete coefficient. You make it more liquid like to have it fill better. Father-in law works for a construction materials company. There are products that can be bought even off the shelf (not specialty) that will make it idiot proof.
You WILL be limited in your house designing options in terms of window layout and how you can load the exterior walls, this can be worked around though. You HAVE to build when the weather permits it or winter conditions will destroy you (gotta heat the whole damn thing while building).
You can't do anything crazy but it's still quite flexible. As far as temp, so long as the conditions are OK for the concrete you can build it. Again concrete formula will make the difference.
It's also a pretty small market where you will have trouble getting "bids" from different contractor, raising prices.
Can't argue there.
Another thing to consider, who actually manufacturers the insulated panels? Do they shrink over the years? Do they decay like cheap ones do? Your envelop's performance will be fubar if you start developing 1/16" gaps everywhere.
That was effectively one of my questions. What I found is that EPS foam is fairly reliable and better companies like Nudura have interlocking blocks that won't come apart unless they are destroyed. Add a fluid applied or peel and stick to the outer walls top to bottom and you should have 0 problems
ICF is not the method of choice for "super efficient houses", it's full of thermal bridges due to all the connectors linking the front and back insulation.