f values (fibre stress) for C16 and C24 Timber Joists?

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Does anyone know the fibre stress (f)( values TRADA use in their Joist Span Tables?

I have f values of 7.5 and 5.1 respectively for C24 and C16 timbers, but I have no idea if these are the values that TRADA use for the standard tables. Any ideas?
 
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Was about to say bending stress figures, but they are 5.3 and 7.5 in BS5268..

Actually prob best to follow the british standard and not trada
 
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Just something to bear in mind; timber beam calculations rarely fail in stress. They almost always (always) fail in deflection.
 

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