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Rimworld pops not building roofs.
Make sure to remove all electronics that short circuit in rain then use the no roof tool in the zone options.
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.
A roof will collapse if the last supporting wall or rock is removed whether by mining deconstruction or destruction.
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.
Once he she is inside the room forbid the door so the colonist can t leave.
If there is no supporting wall or rock within 6 tiles no roof will be built.
You can avoid a collapse by either not mining the whole thing or building a wall to support it.
2 roof construction is a low priority.
Designating such an area will also remove existing thin roofs and thin rock roofs when applied but thick rock roofs will remain intact.
I would not install other roof building mods with this one.
I also tried to remove zone and roof and rebuild from scratch but the problem persists.
Roof collapses cause injuries to colonists and damage items.
As long as there is no other work to be done in there with a higher priority the colonist will finish building the roof.
Sorry to revive dead thread but i noticed no one has mentioned this yet or perhaps it s been added later as an update.
They would not see each others roofs.
A roof collapses if there s no support rock wall within 6 squares of the tile.
You can select one of your colonists and then right click inside the room and prioritize building roof should be an option.
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.
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.
You didn t mine out a mountain you mined out a hill.
I have this stockpile area with roof upon it.
I tried roofing over the geothermal buildings but when i dezoned it it just went from unroofed to outdoors.
A roof will not be fully built in a room that is more then 11 blocks between two parallel sides.