It is insulated - the rafters are boarded (you can see inside) but then on top is insulation - whole thing clad in Corten steel tiles - you can see on the external image that the roof is thicker where the insulation is and thinner on the overhangs.
the roof is thicker where the insulation is and thinner on the overhangs
I've never seen this done before. Interesting.
@hoefla started
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It is insulated - the rafters are boarded (you can see inside) but then on top is insulation - whole thing clad in Corten steel tiles - you can see on the external image that the roof is thicker where the insulation is and thinner on the overhangs.