It's all over the place in impoverished areas, often with a bunch of rocks or tires on top to weight it down. If you actually stay in such a structure though, i

It's all over the place in impoverished areas, often with a bunch of rocks or tires on top to weight it down. If you actually stay in such a structure though, it quickly becomes apparent how little it offers in the way of thermal or acoustic insulation. The sound in a heavy rainstorm can be deafening. You can mitigate the issues with proper design, but at that point may as well use a real metal roof or a prebuilt.