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[kingubu]

So there I was, trying to build a wall, like you do.  And they're standing in the spaces they're trying to build, like they do.  And I cancel the jobs and replace them a few time, like you do.  But they still won't stop standing on top of the tiles under construction.

So then I have a thought, "I can outwit these cheeky monkeys.  I am going to channel out the tiles the walls are going in.  Perfect!  Now they have no way to stand in the tile they're building. No way this can fail."

Then to show me how I am so not the boss of them, my three miners stand in the tiles they're channeling and fall into the water pit below and drown.

Well played, Urist.  Well played.

[FallenAngel]

Well, to fix the wall issue, have you tried making the square the wall is on Restricted and nearby squares High on the traffic thing (d-o)? If the job has been cancelled once you'll need to cancel construction of the wall and set it up again.

[ImagoDeo]

FallenAngel's process can work, but I think the problem happens most often when dwarves have only one route to the site which passes into (or through) the wall they're trying to build. To be more specific, it happens a lot when you use ramps to get builders to a higher level of a building or multi-Z wall, and it happens a lot when dwarves are trying to build square corners on already-standing walls.

Avoiding this is usually a matter of properly planning and executing your build such that dwarves don't have any chance to screw up like they do. Use stairs as often as possible - not ramps - and construct floors for dwarves to stand on so they can reach a wall construction site without standing on it.

[Sergarr]

Hopefully in the next version the dwarves will climb to their destinations, thus avoiding the "stand on construction site" problems.

[Panando]

Yeah this problem is nearly always caused by either 1) ramps or 2) a wall being constructed where they originally would have liked to stand (it's almost like they go "well I can't stand where I planned, so I stand next to it - but "next to it" being the construction tile itself). The latter is fixed by cancelling the wall and re-ordering it's construction, resulting in a new decision about where to stand. Ramp issues are trickier and are best solved by avoiding ramps and/or sacrificing children chickens in voodoo rituals. Sometimes ordering construction with another material also seems to help perhaps because of using a different path.

[Lyeos]

When they cancel their orders, they tend to drop the material onto the space they're on - in this case, where you want to build the wall. As they go for the nearest block, and it happens to be the nearest one, they'll try to use it and stand in the space again. Try building a floor next to it with those materials, deconstructing the floors, and then building the wall. It >should< work.

This in addition to whatever was said above this post.

[krenshala]

Hopefully in the next version the dwarves will climb to their destinations, thus avoiding the "stand on construction site" problems.

It would be nice if it let them build walls upward.  Stand on the spot, build and end up on z+1, on top of the newly constructed wall.  You should still get the "creature occupying site" cancellation if there is something already in the tile at z+1, but just being able to build a wall updward should fix 90 plus percent of these cancellations.  All assuming Toady hasn't already smashed this particular bug already, of course.

[klefenz]

But the climbing will defeat the puropose of some constructed walls. If dwarves can climb up to build them, then gobbos would climb them rendering them useless as defences. Of course !!SCIENCE!! and !!ENGINEERING!! will sove this eventually.

[Panando]

But the climbing will defeat the puropose of some constructed walls. If dwarves can climb up to build them, then gobbos would climb them rendering them useless as defences. Of course !!SCIENCE!! and !!ENGINEERING!! will sove this eventually.

And !!ENGINEERING!! really is !!ENGINEERING!! if it involves magma!

[Sergarr]

But the climbing will defeat the puropose of some constructed walls. If dwarves can climb up to build them, then gobbos would climb them rendering them useless as defences. Of course !!SCIENCE!! and !!ENGINEERING!! will sove this eventually.

Smoothed walls cannot be climbed.

So, all these smoother dwarves? Suddenly they are very useful.

[FallenAngel]

Also, I doubt climbing invaders can climb over any overhangs, making using floors stretching out over your main wall a viable strategy.

[BoogieMan]

I've commonly had issues building constructions. They will often choose the ONLY one spot available that is the WRONG spot to stand on, even when there are alternatives. Traffic designations rarely, if ever, work for me.

 I've even had to redesign areas because certain tiles they just refuse to build on. Yes, I once had a wall section that I removed everything around it refused to be built. 8 tiles around it to stand on but it wasn't accessible. Removed designation, cleared the tile and tried again. Nope! I've had to fill tunnels from the several squares back to get them to stay on the right side. I hope the next version improves this frustrating issue.

[Mentalpatient87]

Also, I doubt climbing invaders can climb over any overhangs, making using floors stretching out over your main wall a viable strategy.

I hope they eventually tire and fall off or something, otherwise you're going to have a bunch of goblins perched up under your ramparts. Seems like they'd be hard to reach.

[klefenz]

But the climbing will defeat the puropose of some constructed walls. If dwarves can climb up to build them, then gobbos would climb them rendering them useless as defences. Of course !!SCIENCE!! and !!ENGINEERING!! will sove this eventually.

Smoothed walls cannot be climbed.

So, all these smoother dwarves? Suddenly they are very useful.

Constructed walls are not smooth nor can be smoothed, but as FA said overhangs, solved.

[FallenAngel]

Also, I doubt climbing invaders can climb over any overhangs, making using floors stretching out over your main wall a viable strategy.

I hope they eventually tire and fall off or something, otherwise you're going to have a bunch of goblins perched up under your ramparts. Seems like they'd be hard to reach.

I'd assume climbers would either not path if climbing is useless or get exhausted from "combat" over time and climb down/fall off.
Then again, I'm not Toady One, so who knows what climbers do.