4.9 - Flashings
4.9.1 – Shallow floor deck flashing options.
Where perimeter beams, or intermediate beams that are to receive shear studs, run parallel to the deck span and the deck width either falls short or is positioned such that a trough is not located over the beam flange, galvanised mild steel flashings should be provided to form a closure to the profile (refer to Figs 4.9.1a to 4.9.1f). Flashings are available in 1.0mm, 1.2mm, 1.6mm and 2.0mm gauges; supplied to site in standard 3m lengths. The exact geometry and requirement for these flashings will be detailed on SMD decking layout drawings where provided.
Refer SMD website for all flashing types/shapes available.
4.9.2 - Deep deck flashing options.
Where the TR220 profile sits on the bottom flange of, or angle fixed to the web of, the beam and the deck falls short by up to 150mm, a flat galvanised mild steel flashing should be provided to form a closure to the profile (refer to Fig 4.9.2a).
Where the last full deck rib in a bay falls such that the trough does not sit onto the beam flange/angle and the gap is greater than 150mm, an additional deck sheet should be provided, split along it’s length and screwed together to form a narrower rib to complete the bay whist ensuring the strength within the edge rib/flashing detail (refer to Fig. 4.9.2b).
The TR220 profile should typically be set-out with the starting trough on the beam bottom flange/angle (refer to Fig 4.9.2c), however depending on bay width it may be necessary to set out the deck using a flat plate flashing on both sides of the bay (as shown in Fig 4.9.2d) to avoid excess materials and wastage.
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