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For a lot of buildings in my city, the bricks themselves were improperly fired because the brickworks employees didn't care. They turned to dust, and the buildings started collapsing. There are a few buildings with those bricks, and any time the brick gets a knick or crack, it's basically done. Within a couple years, there will be a mortar lined void. We've had building's facades fall right off because the brick they were attached to was dissolving, since the facade was attached to cover the faulty brick.

Some of those old buildings, it looks like they just threw bricks and mortar into a slip form and let it set overnight. It's amazing what people will overlook as long as one side of the building looks pretty.