The houses are built of clay with (generally) flat roofs impervious to fire.
He could see the clear starry sky between the dark roofs of two penthouses.
Simple roofs in general use with a double slope are the " coupled rafter roofs," the rafters meeting at the highest point upon a horizontal ridge-piece which stiffens the framework and gives a level ridge-line.
The famous Venetian pozzi, or wells for storing rain-water from the roofs and streets, consisted of a closed basin with a water-tight stratum of clay at the bottom, upon which a slab of stone was laid; a brick shaft of radiating bricks laid in a permeable jointing material of clay and sand was then built.
Occasionally curly tongues of flame rose from under the roofs of the houses.