@abmpicoli

This sheet was made as a very quick reference to room sizes that you can build with really good support coverage. That's pretty much all the use it has :)

Sorry... 21 x 27 .

Check this out: playing with that layout, I've found that a rectangular form, of 23 x 27 tiles (including walls) can be supported by a single column, giving 83,6% usable space: https://ibb.co/gPyQjrp . So... maybe square isn't exactly the answer?

I don't get what is the rocket science fuzz... The limits of roof support can be checked with a very simple experiment: try to build a roof around a single wall tile:

https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2298297100

@Mr-Jangoon

I have tested this breakdown multiple times and unless the roof support radius of a single tile (be it a column or a solid wall) has changed, it still applies, even today.

You can confirm that the coverage of roof supports, assuming you follow the instructions included in it to the letter, are exactly as advertised, provided that your selected room size is one of the above sizes included in the table.

@That Soup Guy

6 units of distance is the radius of a roof support, and your calculations are absolutely true assuming you have a rectangular room that is 12 units of distance wide and any amount of tiles long.

However, they will be wrong for a scenario where your average roof supports roofing tiles around it.

Refer to this article: https://rimworldwiki.com/wiki/Structure#Roof

Or more truely, each can hold a 12 x 12 area (six from each side) making the distance between two supports 12

I'm fairly sure that the max number of tile between supports is 12 in every direction.

It's basically a guide for quick & mostly efficient roofing. I haven't tried to experiment with different roof support setups yet, but there may be better ones out there.

wgat