Definition of "unroofed"

Stone pillars had been raised, a number of them; they stood unroofed, forming a hall of pillars with only the heavens as ceiling, and on the plain beyond the sun was just rising, flaming red, over the edge of the world.

1955, Thomas Mann, translated by Denver Lindley, Confessions of Felix Krull, Signet, published 1963, Book Three, Chapter VII, p. 254

The final stages will be the demolition next year of the remaining part of of the steam Jubilee Shed and the removal of the great, unroofed coaling plant nearby (said to be the oldest in the country); the turntable is also to disappear.

1960 December, “New G.E. Line diesel loco maintenance depot at Stratford”, in Trains Illustrated, page 767

Every eye watched Baba Segi as he barged through the door of the unroofed pit latrine.

2010, Lola Shoneyin, chapter 9, in The Secret Lives of Baba Segi's Wives, Harper Collins