These span tables apply only to flat roof and roof with a slope of up to 10 degrees. 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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