Much research into membrane degradation focuses on the impacts of plasticiser loss, especially with PET-PVC fabrics. This paper presents an alternative perspective based on visual and microscopic inspection of a selection of new fabrics, unused old stock and samples taken from real world naturally weathered structures. The observations point toward nature-based activity – such as biological growth or surface contamination – as a potential accelerant in the degradation process challenging current assumptions and offering a new perspective on membrane condition assessments. In light of these findings, the paper reflects on how ‘end-of-life’ is defined and measured in the new paradigm of climate change. The discussion considers whether visual deterioration should carry less weight in performance assessments, the value of high-performance coatings, and how the industry may better advise clients and practitioners with respect to maintenance and inspection