Steel Buildings in Europe

Part 8: Building Envelope 8 - 11 thickness between 0,75 mm and 1,0 mm. The deck supports a layer of rigid insulation on top of which the waterproof membrane is placed, as shown in Figure 2.9. The use of a high density rigid membrane permits the loads from foot traffic and snow to be carried through the insulation layer to the structural deck without the need for an external metal sheet or spacer system. The deck is capable of restraining the top of the beam or truss, making it ideal for building designs that have simply supported roof structures. However, structural decks are not suitable for plastically designed portal frames due to the need to restrain the inner flange of the rafter in the hogging region. 1 2 3 4 5 6 1 Structural deck 2 External membrane 3 Rigid gypsum roof boards 4 Insulation 5 Vapour retarder 6 Supporting steelwork Figure 2.9 Structural deck and membrane cladding system