Not a builder... This may be obvious
On interior walls of an ICF home, do you normally just fasten sheetrock to the foam block, or should I plan on framing in the walls that are backed by the ICF foam? 

What about bathrooms or any place where you have a wall that is not just painted... such as tile or wood paneling.

Right now I am just planning, drawing floor plans etc and am trying to determine how thick to scale the exterior walls

Thanks
Marv

The more I think of this, it seems that I would need to build a 2x4 home inside the ICF.

skulker,

 

There is no need to build stud wall s inside an icf wall. Most icf blocks have studs built into them on 6-8 or 12" centers. You fasten your sheet rock directly to them. Your wiring goes in the foam so for most applications you should never have to build a stud wall. Go to a few icf websites and you can view a cutaway.

Virgil Schmidt
ICF Builders LLC 

Take a look at the first thread titled "ICF Learning Center". Shouldn't take long to find an answer to your question and there are even a few drawings.

Like GeoDean's summary of info sources for Geothermal, this is a good place to start for ICF newbies. Then learn how to search all the threads for specific topics and more detail.

Thanks to the contributors to the ICF Learning Center and greenbuildingtalk moderators for posting.