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No doubt your consultants are referring to Part 5 of Specification C1.1 in NCC 2019. Clause 5.1(e) calls for a floor separating storeys in a Class 9b building to have an FRL of "at least 30/30/30", or a protective covering on the underside if the floor is combustible. It appears that your floor system will have 19mm plywood on the underside. You could look for a fire retardant coating for the plywood that would provide a 30/30/30 FRL.
SpeciesSolutions is an update to the previous WoodSolutions Species app, keeping the original informative content but improving functionality and adding an easily navigable interface.
Presented by Adam Jones, an Australian engineer working in the industry, Timber Talks, gives you an informative and inspiring insight into the best design practices, latest innovations and interesting case studies from the world leading experts in timber design, specification and construction.
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