To build a roof outdoors a build roof area must first be drawn.
Rimworld how to see roofs.
A direct port of the github version made by aaroncrobinson.
Larger roofed areas can be built with the use of interior walls as pillars.
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.
Designating such an area will also remove existing thin roofs and thin rock roofs when applied but thick rock roofs will remain intact.
Keep in mind each roof tile needs to be within 6 range of a wall to not collapse.
A ignore roof area will cause pawns to not alter the roof in a specified area.
So in my case i had expanded the room and 20 of it was left unroofed.
A roof collapses if there s no support rock wall within 6 squares of the tile.
This is useful for things like.
Removeing mountain roofs 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.
This means that the largest square room you can have is 10x10 internal.
A remove roof area will cause pawns to remove any roofs in a given area.
I deconstructed the door then rebuilt it.
The first icon in the bottom row is a picture of a house.
On the bottom right corner of the screen are a bunch of buttons that toggle certain options and overlays one of them turns roof display on.
When you click that all the roofed tiles on the map that you can see not hidden tiles show up with a green overlay.
There is two rows of icons in the lower right of the screen.
It was a wonderful day that one of the recent alphas i think a15 included this option.
Indoor roofs are automatically built by builders.
Light green for constructed and thin roofs and dark green for overhead mountain roofs.
If you removed 2 entire walls and the corner between those two sides last then that roof was too far away from any other supports.
Works on 0 19 0 as well as 1 0 0.
A build roof area will cause pawns to build a roof in the specified area.
Areas can be designated to have a roof or not have a roof by drawing either a build roof area or remove roof area.
Reworked from vendan s original idea.
It seems the roof building is triggered only upon completion of an enclosed room.