Abstract: A method for fabricating a structural beam having a cross-sectional profile. First portions of the profile being in compression and second portions of the profile being in tension due to a loading force. The beam also having compressive and tensile structural elements. Each structural element includes an enclosure having walls, and a non-compressible material disposed in their cavity. The walls of the compressive structural elements each have at least a portion thereof inwardly shaped towards the first cavity such that when deflected by the loading force, the walls exert a compressive force against the non-compressible material in its cavity, resulting in a resistance to the deflection and the loading force.