Concrete
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Concrete
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
Acquisition
Constructing concrete requires Stonecutting to be researched. Each tile requires 1 steel.
- Floors
- Burned floors (Carpet, Straw matting, Wood floor, Bioferrite plate
) • Concrete • Flagstones (Sandstone, Granite, Limestone, Slate, Marble) • Gold tile • Paved tile • Silver tile • Steel tile • Sterile tile • Straw matting • Wood floor • Fungal gravel 
• Hex tile • Spikecore plates • Totemic boards - (research)
- Carpet • Stone tiles (Sandstone, Granite, Limestone, Slate, Marble) • Fine carpets
• Fine stone tiles (Sandstone, Granite, Limestone, Slate, Marble) • Hex carpet • Mindbend carpet • Morbid carpet • Morbid stone tiles (Sandstone, Granite, Limestone, Slate, Marble) • Spikecore stone tiles (Sandstone, Granite, Limestone, Slate, Marble) • Totemic stone tiles (Sandstone, Granite, Limestone, Slate, Marble) • Bioferrite plate - Floor coverings
- Animalist slab (Medium, Broad) • Morbid slab (Medium, Broad) • Rustic rug (Medium, Broad) • Spikecore floor-star (Medium, Broad) • Totemic slab (Medium, Broad)
- Related
- Bridge • Smooth stone • Void metal