Here are some photos of us building our home about 5 years ago. We decided on the ICF Nudura block for its durability and ruggedness. Insulated Concrete Forms from NUDURA; environmentally friendly building with Insulation Concrete Forms. The walls are 1 ft thick and provide a R-value of 51 and can withstand a rictor 10 on the earthquake scale also. It is almost fireproof with the addition of a concrete based siding called Hardie board.