My knowledge on this is very slight, but there is a tangential reference in Strabo's Geography (5.3.7) about how Augustus was particularly concerned by Rome's susceptibility to mass fires and so organised a group of freedmen who would help protect against this. Augustus also set limits on how tall buildings could be and there's a line of argument which suggests this too was an anti-fire measure as much as to prevent them from collapsing: since we believe higher floors in taller buildings tended to be built with cheap materials (read: flammable wood) because landlords wanted to maximise their potential profits from their plot of land. Therefore, in limiting the heights of buildings Augustus may have been indirectly trying to target buildings which were the most problematic with regards to spreading fires across the city. (Source: Yavetz, Z. The living conditions of the urban plebs in Republican Rome, pp.173-4)