The gutter (1) is for a warehouse (2), and is of tubular profiled section, typically extruded. A condensate trough (7) can be provided on each side of the gutter, together with supporting edges (8) for roofing panels (28). Grooves can also be provided on opposite sides for a layer of insulating material (10), and the gutter surface towards the interior of the warehouse can be clad with an insulating strip, typically of plastic foam with metal reflective coatings each side. Anchoring edges can also be provided for roofing panels on either side.
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