A concrete-filled ICF house can be the most fire resistant dwelling possible, and is particularly well suited for construction in areas of California that face a wildfire threat, such as the foothills of the Sierra Nevada, Oakland and Berkeley hills, the Santa Cruz mountains, and other wooded or brushy rural areas.

To provide maximum resistance to wildfire:

1. Construct your house with concrete-filled ICF walls from foundation to roof.

2. Finish the exterior with a non-combustible exterior sheathing such as stucco, synthetic stucco, cement-based siding (Hardie Plank, etc.), metal siding, or stone.

3. Roof the house with a non-combustible roofing material:  metal, stone or cement.

4. Minimize wooden exterior trim.

5. Fully soffit the eves of your house using a fireproof material. 

6. Similarly, in the best case, construct decks of entirely non combustible materials (concrete and steel are best) or at least, enclose the decks such that fire cannot get underneath the deck.

7. Follow local fire agency recommendations regarding clearing defensible space around the structure.

There are numerous resources on the web that provide guidelines for construction of homes in areas where wildfire can be a hazard.