What's the deal with upward stairways in Dwarf Fortress?

So I’m really new to this game, so please bear with me. I got this message: Digging designation canceled so I went on the wiki and discovered this information: The safest thing to do is back off several tiles, mine up a z-level then approach the location again.

And that’s what I wanted to do but how can I mine-up a z-level without doing it from outside? Because I tried to build and upward stair with no luck so far. What am I doing wrong? On the wiki it’s said: Up stairs need to be built below down stairs. Up/down stairs function as both up and down stairs at once.

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  • So I know they have to be build below down stairs but can I build the up stairs first and then the down stairs.

    If not how can I travel between Z-Level and the level above without going outside and mine a new entrance?

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  • One Solution collect form web for “What's the deal with upward stairways in Dwarf Fortress?”

    to be functional, a stairway needs stairs in both levels (above and below), here’s an example:

    level 0:     level -1:          legend:
    .....        .....              . floor
    ..>..        ..<..              > down stairway
    .....        .....              < up stairway
    

    You can create stairways with two methods: either through mining (d) or through the construction menu (b C). Use the mining menu when there is rock or soil at the location of the future stairway. Use the construction menu when there is nothing at the target location.

    If you have already mined out a level and you need to access the floor above, you’ll need to create an up stairway (b C u). If there is a natural floor above you will need to mine it out (d j) to have both parts of the stairway.

    If there is no floor above (the tile has been channeled or maybe you’re building a tower), construct a down stairway (b C d) on the level above your up stairway.

    See the example of the construction of a tower on magmawiki for further reading.

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