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Hi Hugh! <br />The blue board you speak of (it also comes in pink) is an extruded foam board used as insulation in buildings. This is a much denser, & more durable material than the white "bead board". It comes in 4x8 sheets, ranging in thickness from 1/2" to 2". <br />Where I live,(southeast U.S.) it can be found at most building supply, or home improvement stores. The price is comparable to plywood. <br />I prefer the 2" thickness for most uses, but you can laminate sheets of it together to get any thickness you want. <br />Styrofoam is a trademark owned by the Dow Chemical Co. In fact, I've heard builders refer to the foamboard as "Dow board". Perhaps you could contact Dow, & they could tell you if there's someone in your area sho sells it. At least call some of your local building suppliers.
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