Concrete is a composite material of binder, aggregates and water. It is naturally heavy in weight and has high compressive strength. However, conventional concrete's application is limited mostly to mass constructions thereby restricting its widespread usage in special application areas. A best alternative is the use of Foam Concrete (FC) in areas of small loads. Foam concrete is comparatively lightweight thus reducing the dead weight of the structures and also lowering the cost of production, construction and transportation. Foam Concrete is commonly prepared using cement, sand, water and foaming agent. Because of its porous matrix, it also serves as a low cost, highly effective solution for thermal and acoustical needs of the building. In addition, its lightweight and self-compacting properties makes it even easier for use in special construction. Our study focusses on understanding the properties of Rice husk ash replaced FC in 50% and 100% replacement to sand. A short study is conducted by casting cubical concrete specimens of size 7cm×7cm×7cm in order to analyze and compare the properties between conventional Plain cement mortar, conventional foam concrete, 50% and 100% replacement of sand with rice husk ash. The foaming agent used to prepare foam concrete is SLES – Sodium Lauryl Ether Sulphate (a common surfactant in soaps).Rice husk ash utilized as replacement for sand would be an ecofriendly option. Properties mainly Compressive Strength(at 7 days and 28 days), water absorption and dry density were studied to assess the effectiveness in replacing sand with rice husk ash and its suitability in making foam concrete. The results of these tests were found to be satisfactory and the use of foam concrete replaced with rice husk ash is recommended.