I am thinking about the ICF roofing system for my upcomming house build.  I have No Idea how much this will cost.  Im sure its alot though.  I also would love to be able to use this system on the floor under the slab.  I will be building in the Orlando, FL area, so I am looking for the most insulated option against the heat and the structural intergrity that will withstand the sometimes weekly hurricanes we get in FLorida. 
Also, what kind of finish options are there on one of these types of roof?  What do you put on them?  Can you put metal shingles on it?  Spanish Tiles?  It would need to be one or the other though, regular shingles are not going on my house.  I want a roof that is strong and a shingle system with a life expectancy longer than me.  so 40 - 50 more years if im lucky.

Im pretty well informed on ICF.  So I know the house will be ICF built.  I just dont know about the roof.  I am trying to avoid having any wood at all in the structure of the house.  Have you seen the termites down here?  Geeze.   I already know how to prevent them from boring thru the foam so thats not an issue.
Any input will be helpful.  A cost per sq/ft would be awsome as well.    Like I said, I know its gonna be alot,  but is that $15 a sq/ft or $25 a sq/ft?  Would be great if it was less.