Illawarra Sprayseal has the know-how, experience, personnel and equipment to handle all road construction projects. From repairs and maintenance cement and lime stabilisation to construction of main roads under traffic conditions, Illawarra Sprayseal provides a professional finish every time. Road Base in pavements refers to the sub-layer material of an asphalt roadway placed directly onto area after undisturbed soil is removed to provide a foundation to support the top layer(s) of the pavement.