4.1. The non-combustibility of materials used
in "A" and "B" class divisions shall be verified in accordance with part 1.
4.2 Where combustible veneers are allowed to be
provided in "A" and "B" class divisions, the low flame-spread characteristics
of such veneers, if required, shall be verified in accordance with part 5.
4.3 If an aluminium deck is tested with insulation
installed below the deck, then the result will apply to decks which
are bare on the top. Aluminium decks shall not be provided with deck
coverings or insulation on the top unless tested with the deck covering
or insulation included, to verify that the 200°C temperature of
the aluminium is not exceeded.