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In page Ancient Roman architecture:

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Multi-story apartment blocks called insulae catered to a range of residential needs. The cheapest rooms were at the top owing to the inability to escape in the event of a fire and the lack of piped water. Windows were mostly small, facing the street, with iron security bars. Insulae were often dangerous, unhealthy, and prone to fires because of overcrowding and haphazard cooking arrangements.[citation needed] There are examples in the Roman port town of Ostia, that date to the reign of Trajan, but they seem to have been found mainly in Rome and a few other places. Elsewhere writers report them as something remarkable, but Livy and Vitruvius refer to them in Rome.[1] External walls were in opus reticulatum and interiors in opus incertum, which would then be plastered and sometimes painted.