Based on observed behaviour in previous earthquakes and subsequent extensive research, it is now well understood that hollow-core floors can be highly vulnerable to earthquake damage. This is particularly the case for older floors with poorly configured support details. Between the ‘Purple Book’and the Appendix C5E of the ‘Yellow Chapter’the industry is equipped with wellconsidered assessment tools for hollow-core floors. Very little guidance, however, is provided for the often-required seismic retrofitting of these floors. While Chapter eight in the PCFOG report provides a useful overview of potential retrofit techniques, some of the information has become outdated. In this paper: