Biomass power plant has provided an alternative source of power. However, the biomass production produces enormous volume of waste especially fly ash and bottom ash. These ash materials are expensive to manage or eliminate. Experimental studies have been conducted to identify ways to reuse these waste materials, including road building. Both types of ash have similar properties to that of natural materials used in road construction as well as pozzolan, which is used to make concrete as it is an excellent binding material. However, because fly ash and bottom ash contain heavy metals and pollutants, further assessment on the environmental impact together with physiochemical characterization are more than necessary.