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You're trying to apply modern concepts to these materials. Humans have been using bricks for over 9,000 years. A post-apocaplyptic civilization is going to be going back to basics.

> But it’s far easier to work with scrap wood and metal than it would be to find sources for all the materials you’d need for brick.

Dirt, water and either straw or sand. I can understand if you're looking for a quick, temporary solution. But any longterm settlement is going to move onto much better materials before long.

> and then searching for limestone or calcium aluminate for concrete

You don't need concrete. Concrete was invented in 1824. People were making buildings and walls out of bricks millenia before then. You can even use more mud as your mortar.

>Not to mention the fact that you also need to move all of that, plus large quantities of water

Settle near (for obvious reasons other than making bricks). Make the bricks at the point of use.

>You need a series of kilns for firing bricks

You can dry mud bricks in the sun.

>which probably means you’re reclaiming a good amount of discarded wood anyway.

Burn brahmin dung.

>It’s far easier to use materials that are just laying around your settlement already, like wall boards from existing buildings or sheet metal from crashed cars, trucks, busses and aircraft.

The materials for making bricks are literally everywhere.