Q: For extra insulation in the winter I suppose one could add extra sheets of EPS to the existing 4 inches on the outside wall?

A: (Kelly)As long as you devised a way to anchor the eventual exterior siding to the wall, you should be able to add more insulation, which would only the thermal performance.

C: My name is Geoff Blackbeard. I am the inventor of the Thermalwall Building Technology. I recieved a call from a gentleman from North Carolina today who informed me that he read about my process on your site greenhomebuilding.com. He was concerned about the thermlmass effect of the ICF's and noticed that our method had the insulation on the exterior of the concrete mass. I would like to extend my sincere gratitude for your insight and accurate comments about Thermalwall. I have studied the issue of thermal inertia for over 20 years and as you know there are lots of opinions as to what works best. My 88 year young friend often tells me use applied common sense and the answers to your questions will come much easier. Keep up the good work. If I can ever be of any help please do not hesitate to call or email me. Phone 506-372-4842