You can avoid a collapse by either not mining the whole thing or building a wall to support it.
Rimworld pops not building roofs.
A roof collapses if there s no support rock wall within 6 squares of the tile.
The weird thing is that i am not able to build roof on that square.
Green build constructed roof area red remove constructed roof area option settings to enable disable auto roof building power outputs and roof cost adjustment sliders compatibility.
Roof collapses cause injuries to colonists and damage items.
I also tried to remove zone and roof and rebuild from scratch but the problem persists.
If there is no supporting wall or rock within 6 tiles no roof will be built.
I have this stockpile area with roof upon it.
When building a large room 10 x 10 tiles i had the same problem the roof being missing exactly in the middle and i absolutely couldn t get them to build one.
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A roof will not be fully built in a room that is more then 11 blocks between two parallel sides.
I tried roofing over the geothermal buildings but when i dezoned it it just went from unroofed to outdoors.
Make sure to remove all electronics that short circuit in rain then use the no roof tool in the zone options.
2 roof construction is a low priority.
As long as there is no other work to be done in there with a higher priority the colonist will finish building the roof.
You can select one of your colonists and then right click inside the room and prioritize building roof should be an option.
Designating such an area will also remove existing thin roofs and thin rock roofs when applied but thick rock roofs will remain intact.
Once he she is inside the room forbid the door so the colonist can t leave.
The no roof area allows the player to designate an area which will not be covered by thin roofing once a surrounding wall is constructed.
A roof will collapse if the last supporting wall or rock is removed whether by mining deconstruction or destruction.
This means that the largest square room you can have is 10x10 internal.
If it s an overhead mountain collapsing colonists will be buried alive.
If that distance is more then that then you will only get a partial roof around everywhere but the position where it lacks enough support.
You didn t mine out a mountain you mined out a hill.
I would not install other roof building mods with this one.