Alexander Cagolcol | Tahnia Dalit | Dominic Galang | Geoffrey Garcia | Lorraine Manrique | Lianne Athena Mariano | Joseph De Mata | Jerkin Jexel Pedrosa |
April 30, 2026
This study investigates the development and thermal performance of an eco-friendly reflective paint utilizing eggshell powder as a sustainable, waste-derived pigment to mitigate heat accumulation in roofing materials. Three experimental paint formulations with 15%, 30%, and 50% eggshell concentrations were created and evaluated alongside a commercial reflective paint and an unpainted control roofing sheet. Statistical analysis using a One-Way ANOVA confirmed the overall efficacy of the eggshell coatings: a highly significant difference (P<.001) was found in the Cooling Differential when comparing all five treatments, demonstrating that the eggshell paint coatings successfully utilized the eggshell's calcium carbonate (CaCO3) to achieve high Solar Reflectance and significantly outperformed the unpainted control in reducing heat transmission. Crucially, an ANOVA comparing the three eggshell ratios (15%, 30%, 50%) revealed no significant difference in thermal performance (P = 0.539), indicating thermal equivalence across the concentrations; this means that increasing the eggshell ratio does not yield a statistically superior cooling effect. Descriptively, the 15% Eggshell Paint formulation recorded the highest mean cooling differential at 6.74°C, confirming its status as the most resource-efficient option. The study concludes that eggshell waste is a viable and effective additive for creating cool coatings. Future research is recommended to shift focus from basic thermal testing to quantifying the international standard Solar Reflectance Index (SRI) and assessing durability, adhesion strength, and rain performance to definitively determine the optimal formulation for long-term use.