PurposeThis paper contributes to discourse about complex disasters by applying cultural lenses to the study of coastal infrastructure (such as seawalls and dikes), thus departing from studies that focus on characterising, assessing, and predicting the physical resilience of hard structural forms that dominate knowledge about coastal infrastructure.Design/methodology/approachThis ethnographic study nuances Philippine coastal infrastructure through examining the material registers of a seawall bordering an island inhabited by artisanal fisherfolk. By “material registers”, this research refers to the socially informed ways of regarding and constructing material configurations and how the latter are enacted and resisted. Data collection was accomplished through focus groups with community leaders, on-site and remote interviews with homeowners, and archival research to further understand the spatial and policy context of the structure.FindingsThe discussion focuses on the seawall’s three material registers (protection, fragility, and misrecognition) and reveals how infrastructure built for an island community of fisherfolk simultaneously fulfils, fails, and complicates the promise of disaster resilience.Research limitations/implicationsThis research demonstrates the potential of “material registers”, a term previously used to analyse architecture and housing, to understand the technopolitics of infrastructure and how materially informed tensions between homeowners' and state notions of infrastructure contribute to protracted experiences of disaster and coastal maladaptation.Practical implicationsThis research signposts the need for disaster risk reduction, climate adaptation, and sustainable development policies that legitimize the construction of infrastructure to recognize the latter's relationship and impact on multiple sphere of coastal life, including housing and citizenship implications.Social implicationsThis research highlights how infrastructure for coastal disaster risk management implicates geographically informed power relations within a community fisherfolk and between their “small” island community and more politically and economically dominant groups.Originality/valueWhereas studies of coastal infrastructure are focused on quantitative and predictive research regarding hard structural forms in megacities, this study apprehends disaster complexity through examining the cultural and contested nature of infrastructure for coastal flood management in an island community of fisherfolk.