If it's densely packed, most materials will be fire-resistant. The same can be achieved with straw.
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I assume that Mud brick is also fire proof? Also it's supposed to be breathable. Wonder if we should start building from older materials. Of course you won't be building high structures from it. Imo we just need lot's of cheap housing, they should start building commie blocks(panel housing) again. They are efficient and if designed right great place to live.
Sadly, it's illegal to build with adobe in 48 states in the USA, with tiny loopholes in 3 or 4 (where it's okay if you build it yourself, but it's still illegal to have a contractor build you an adobe home.)
Adobe breathes well, and outperforms stick homes by a factor of a bazillion when it comes to keeping the sun's heat out, requiring less (or no) AC.
There are tons of tall structures built from adobe in the middle east, and they can survive earthquakes better than stick homes.
In the great USA lobbyists have made adobe homes illegal. Homes require mortar or lumber.
Here's a good video on the subject: https://youtu.be/5fe3rP92hjY
Problem is that there's no single solution to building materials, as the materials' properties depend greatly on the local climate. Wooden houses are very breathable and can last hundreds of years with proper maintenance, but are only really suited for drier climates, such as Scandinavia and other parts of northern Europe. Brick is solid and more fire-resistant, but needs carefully designed ventilation (just look at the damp old houses in the UK and southern New Zealand). Metal parts are great for structural strength, but are at risk of corroding if they're used near the sea. In the US, you could compare houses in f.ex Arizona, Louisiana and Washington. Panels made of straw and sawdust could be great in some areas, but in some other areas (tropics, for example), they would most likely be unusable.
Those were made of concrete and steel, and we're running out of concrete... Not sure they'd still qualify as blocks if they were a handful of stories high at best...
The red ones aren't made of concrete.
Those are super neat. I saw a video about how that was sidelined when they made the insulation regulations in the 1900s, which was a real bummer.
One of the things to consider, beyond the dry climate requirements mentioned already, is that you can't use it as a drop in replacement for fiberglass insulation. You have to plan the building around it because it requires a lot more space, relatively speaking.