All the figures are based on the normal loading conditions found in domestic construction in any other situation you should refer to the trada document span tables for solid timber members in floors ceilings and roofs for dwellings or ask your building control officer for advice. Span tables for flat roof joists to bs 5268 7 2 imposed loads of 0 75 kn m for maintenance and snow load are applicable where there is no permanent access no fixed ladder or staircase and most areas where the altitude does not exceed 100 metres refer to bs 6399 3. Now in its 4th edition the trada span tables publication is a must for any designer or builder. 
				
			
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