<p>In this study, weathering and disintegration behavior of carbonate rocks collected from different parts of southeastern Türkiye are investigated by comparing conventional slake durability index test and recently developed Configured Discard Method (CDM). As carbonate rocks form the foundation of countless engineering structures, accurately predicting their durability is essential to prevent long-term structural degradation and economic losses. A total of eleven carbonate rock samples consisting of micritic, fossiliferous, and dolomitic limestones were examined in this study. The physico-mechanical properties of the samples were characterized through tests including porosity, Schmidt hammer, point load, unit weight, water absorption and sonic velocity. Durability characterization of the samples by conventional method reveals a range from medium high to very high, whereas the CDM reveals a wider and lower range which is from low to medium high. The CDM method shows that some samples classified as durable by the conventional test are in fact less resistant, providing a more reliable durability assessment. A new modified equation was introduced by substituting dry sonic velocity for effective porosity which provides a non-destructive and practical alternative with consistent classification outcomes. Results indicate that rocks having low porosity and high density (S8, S10) reveal high durability, whereas those having high porosity and low strength (S1, S2, S4) demonstrate low slake durability. These results emphasize the significance of the improved CDM in bridging laboratory observations with real-world weathering behaviour, enabling more reliable material selection and long-term performance prediction. The improved CDM and its sonic velocity-based adaptation enable more accurate durability prediction and material selection for engineering and heritage applications involving carbonate rocks.</p>