An insulated concrete structure including at least one longitudinally-extending side panel and at least one web member partially disposed within the side panel. The web member extends from adjacent the external side of the side panel through and out of the interior surface of the side panel. The first embodiment of the present invention uses opposed side panels that form a cavity therebetween into which concrete is poured and cured. The second embodiment uses a single side panel as a form, onto which concrete is poured. Once the concrete cures on the single side panel, it is used as a tilt-up wall, floor, or roof panel.