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Concrete costs one steel, and with the exception of smoothing stone for free, concrete is the cheapest flooring. It is fireproof and effective at creating a fire barrier two tiles wide around buildings to protect them, or around fires to keep them contained. Its downside is its -1 beauty, identical to that of a natural floor, can lead to the Ugly Environment thought.
Concrete may be useful outdoors underneath wind turbines, as concrete will prevent trees from growing and interfering with the turbine's performance.
Concrete may be removed, with roughly half of these tiles returning 1 steel