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Used white styrofoam in our garden railroad building a via duct . Use 5 sheets laminated them together with construction glue stagering the joints and painted with white cement for a cement finished viaduct. Heavy rain water run off flows through with no damage. The only time we have had to perfform any tough up is when a tree branch has fallen on it. Has been in the garden railway for over 3 years and does not crack when the below freezing weather comes and when the sun shines on this structure either. <br /> <br /> <br />Mikadosurp
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