Or we may have to change building materials. In Asia, houses are built using granite foundation, brick and cement walls, and concrete slab roofs. Houses built using those materials don't go up in flames.
They are also fire resistant
In the west.....a concrete/rebar home would cost more per sq foot than a modern hardwood/brick luxury home, because a contractor would have to do some pretty insane procurement, and work...a lot.
Plastics/Vinys/Composites used in the west satisfy 2 of those 3 qualities listed earlier, anyway You could even call them hardy as compared to old thatched roofs, sod walls etc.
Now.....let's be realistic. 70 MPH firestorms are historically devastating. Your concrete home in this scenario is destroyed and no longer structurally sound due to the heat stress, exploded water pipes, carcinogens. Everything is fuel when the heat/wind is that high. And if it isn't fuel, it's getting beat up by it.
I have problems with the way this fire waas handled (IE, not maintaining a properly paid wildland force or AIR corps of said force), but I really can't see mass concretization as away out. Simply put: anyone building in LA right now is on some good drugs.
- 70 MPH firestorms: Currently houses made of wood are fuel for the fire. When houses are made of concrete and steel the fuel is taken away and fires don't spread as easily. Why don't we hear of fire devastating homes in the Middle East? Because buildings in the Middle East are constructed using concrete and steel. These materials are less likely to ignite and spread fire compared to traditional wooden structures.