Stairs allow creatures to travel across z-levels. They can be dug out or constructed. They need to be connected to other stairs of the appropriate type to function. Up stairs need to be built below down stairs. Up/down stairs function as both up and down stairs at once.
Stairs do not block creature nor fluid movement. Falling creatures ignore stairs and may get seriously hurt if the real ground is several z-levels below them. Floor hatches can stop both falling creatures and liquid. They can also be locked to keep those pesky crundles from interrupting everything your dwarves could possibly do.
As with all constructions, stairs can only be removed by dwarves (ordered to do so - never on their own initiative) or cave-ins. Dug out stairs can melt, if made from ice, but are otherwise just as resistant to damage.
Stairs are fully capable of holding any amount of weight above them. They are not as resistant to cave-ins as full walls, though; they won't stop falling cave-ins.
Designating to build an up/down stair on top of a block with an item on it (such as a stone) and a down stair dug into the floor below it, may cause dwarfs to constantly suspend spam. Verify?
|Workshops • Furnaces|
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Jail • Meeting hall • Hospital • Office • Sculpture garden • Tomb • Zoo
|Furniture||Animal trap • Anvil • Armor stand • Bed • Bin • Bucket • Cabinet • Cage • Coffin • Container • Restraint • Seat • Statue • Table • Weapon rack|
|Access||Door • Floodgate • Bars • Grate • Floor hatch • Bridge • Road • Window|
|Constructions||Fortification • Floor • Stairs • Ramp • Wall|
|Machine & Trap parts|| Axle • Gear assembly • Millstone • Screw pump • Water wheel • Windmill • Lever|
Pressure plate • Trap • Support
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