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In this study, a modified asphalt preparation was made for roofing materials by adding silica extracted from rice husk.The ratios of asphalt to silica are 1:0, 1:1.6, 1:1.8, and 1:2 by weight, and calcined at the temperature of 150°C for 6 hours. The structuraland microstructural characteristics of asphalt composites were examined by x-ray diffraction (XRD), Scanning Electron Microscopy/Energy Dispersive x-ray (SEM-EDX) Spectroscopy and Differential Thermal Analysis (DTA-TGA), respectively. The XRD study revealed that the major phases werecarbon and silica amorphous. The surface morphology of asphalt without silica addition presents a cluster of larger size than the cluster of asphalt with an addition of silica. The addition of silica increased significantly the thermal stability of the asphalt due to the formation of physically crosslinked silica network structure. DTA/TGA analyses produced that temperature decomposition increased with the increasing silica addition from 230 to 315 °C.