In some places you can not remove the thick roof.
How do you remove a roof in rimworld.
You have to leave the walls to prevent the roof fall.
Do not recomend the second option it is slow and well lets just say high odds of people pancakes which are not good if you like those people but it is good for mining xp.
Use the regular remove roof area option found in the architect zone area menu to draw an orange area above the roof you want to remove.
They will remove it like any other roof.
The no roof zone will remove constructed and thin rock roofs from the selected tiles.
I think the second approach will let you force a colonists to remove a roof section but i don t think it will generate any tasks to do so automatically.
Are you sure you are using the remove roof zone and not just removing the build roof zone there are 4 roof buttons in total.
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So i try to remove the mountain roofs so they don t collapse by declareing a no roof area but on some tiles it will never be possible to declare that area and if i let the roof collapse and remove the debris it just collapses again presumably forever since i tried removing it 15 times and it still collapsed.
Wait for a pawn to remove it or select a constructor pawn and right click the area to instruct him to do it right away.
Don t remove entire walls if they re the only thing holding up a roof.
You can only give it to fall.
You cannot remove overhead mountain roofs.
Leave some walls from the edge and take away it gently so that the colonist is not filled up.
You still have to wait for colonists to go and remove the roof segments or you can force them to with a right click on the roof section you want to remove after marking it as a no roof area.