Windstorms cause significantly more damage to residential houses worldwide, compared to other natural hazards. The performance of housing envelope and structure under wind load must be predicted in order to mitigate the damage. This study presents a vulnerability assessment for roofing components of masonry block houses (built in cyclonic regions, Australia) subjected to tropical cyclones. A vulnerability methodology is developed to assess the performance of roofing components at different areas of the roof subjected to wind loads. The wind load and the component strengths are treated as random variables with appropriate probability distributions. These distributions are derived from available test data, experiments, structural analysis, damage investigations and experience. Design details including types of structural components of houses are obtained from surveying houses and analyzing engineering drawings. Wind loads statistics on different areas of the roof are obtained by wind tunnel model studies. Reliability methods incorporating probability theory is used for calculating probability of failure. The vulnerability curves are presented for roofing components/connections in different areas of the roof of masonry block houses. Finally, the interdependency between roofing components (load sharing) and the possible progressive failure of the overall roof of the masonry block house are discussed. The outcome of this study provides data for developing a tool (computer programme) for assessing the vulnerability of houses to quantify building damage during a wind event.