Originally posted by Grailoch:

Maybe start building internal floors up, see how close to roof you need to get to be "sheltered."

i think it has to do with the horizontal distance.
because right now i have to go about 10m below the roof on the corkscrew stairs to be sheltered, but i have a roof on my main base that's higher than that.
and i think that's because the roof gets too wide below that, so it no longer recognises the edges.