They would not see each others roofs.
Rimworld build better roof.
Until some building logic is reworked there are a few ways to easily create collapses.
I would not install other roof building mods with this one.
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.
Is this an alpha bug.
Enclosed areas will automatically prompt colonists to build a roof unless you apply a no roof region or if the structure is too large over 300 cells.
I made a tiny room in the middle and result.
Structures leave ash on the ground when burnt.
Colonist 2 and colonist 3 join colonist 1 in.
The workers only built the floor and walls and doors but still no roof.
Rimworld defaults sechdule of the day between sleep and anything.
I built a buidling with walls and floors and a door but for some reason it has no roof.
They built a roof over it.
Should i quit playing and come back in 6 months.
Even when i went to the expand build roof button and cover the whole room.
Rimworld alpha 17 mod adds in solar panel roofing as well as a transparent type of roofing.
Colonists can build structures of a various materials each with different beauty flammability and hit points.
1 does the roof have support.
Might be worth looking at the restrict tab.
I have tried building even a small 5x5 room and it still does not roof up.