The insulation depth depends on the type of profile, and it is the concrete cover to the main crest of the deck for trapezoidal profiles and the full slab depth for re-entrant profiles. The minimum thickness of concrete required to satisfy the insulation requirements is shown for trapezoidal and re-entrant decks when subjected to a BS 476 Part 20 fire test. It is not normally necessary to fire protect the exposed soffit of the deck.īS 5950 Part 8 provides a table of recommended concrete thicknesses to satisfy the insulation criterion for common periods of fire resistance. It acts as a diaphragm preventing the passage of flame and hot gases, as a shield reducing the flow of heat into the concrete and it controls spalling. The deck does however play an important part in maintaining integrity and insulation. In the fire condition standard, although conservative, practice amongst designers is to assume that the steel deck makes no contribution to overall strength. Measurement of minimum insulation depth of concrete
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