Constructional structure e.g. roof unit, has parts e.g. panels, which are composed of wood material, and partially surrounds plastic foam-insulating layer, where insulating layer is composed of strongly packed plastic foam material
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Packaging foil for styrene foam plates or blocks at least impedes passage of light rays through it
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Wall or roof element
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Roof has heat insulation plates fixed to rafters and joined to each other by tongue and groove connections with plates on outsides and insides formed with plastic foam layers
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Drainage plate of plastics foam has grooves on top and bottom sides to intersect at points where drain apertures are provided
