Sometime ago I saw a program building a rustic cottage in Nantucket I believe. They wanted the exterior tongue and groove siding to be exposed on the interior. The walls were insulated on the outside with rigid insulation - no problem. For the roof, they used a product that was 4" rigid insulation, with I think 3/4" plywood attached. This was attache to the roof with the plywood up, and shingles were nailed to the plywood. I would like to find more information about this product. Who makes it etc.?
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