How far does a roof go from a wall?

[Chibiabos]

I did a search on the forum, saw this question asked, but saw no definitive answers (apologies if it was, in fact, answered definitively).  Some theorized anywhere between 6 and 15 tiles.  Its useful to know (and hopefully a definitive answer will put something on the wiki for it).

I think I have found it ...  I am trying to build a greenhouse, as suggested in my gripes that Devilstrand is impossible to grow to full harvest in Boreal or colder biomes (any of the newer climes in alpha because it won't fully grow outdoors before the first cold snap wipe it out (and its not really that close, still had half of its growing left to do), and hydroponics proves useless because a solar flare even a couple months apart will destroy every hydroponics crop.

So, I am building an unfloored building to house a Sun Lamp and grow crops.  The Sun Lamp spans a diameter of 11 tiles, so I built a 13 by 13-tile structure (the wall perimeter, providing an interior space of 13 x 13).  I noticed upon completing it that the exact center tile has no roof ...

I take this to mean, then, that the farthest a roof will reach from a wall is five tiles (not counting the wall's tile).  If my experiment and finding are correct, then pillars should be built ten tiles from a wall (that is, ten tiles between them, not counting the pillar tiles) and ten tiles apart.  They might need to be closer if the roof is computed by a radius formula due to diagonals (someone should test this).  If someone out there is dedicated to research all this out in game, put the findings on the wiki so they're easier to find please (or post them here and I will do that).

Thanks!

[Shinzy]

it's 5 squares from the closest wall
so you can have 10 by X rooms anything larger is gna need some supports

Or you can even use the sunlamp's radius to check the boundaries =P it's nearly the same size as the supported roof area of single block

[RawCode]

Its pretty easy to test self.

Long time ago in far away galaxy i created rooms of variable size in order to measure how large it can be without any additional support.

It costed me about 3 minutes to test everything with devmod...

Devmod can be enabled from settings, also you will need to activate "godmod" in order to build everything in instant, you will find white buttons on top edge of screen when devmode is enabled.