Abstract: A cementitious mixture includes a light weight material, cement, resin, sand, fibrous material, and water. In one form, the constituent components are selected to provide a settable liquid or mobile solid which, when set to form a solid, achieves a predetermined selection of parameters comprising two or more parameters selected from available parameters, said available parameters including density, compressive strength, sound insulation, thermal insulation and fire rating of the solid. In another form, the relative concentrations of the constituent components are adjusted according to a predetermined formulation to provide a settable liquid or mobile solid such that, when set into a solid, the solid possesses a predetermined selection of parameters comprising two or more parameters selected from available parameters, said available parameters including density, compressive strength, sound insulation, thermal insulation and fire rating of the solid.