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Method of calculation from the BPF Code of Practice wrong ?

Method of calculation from the BPF Code of Practice wrong ?

Method of calculation from the BPF Code of Practice wrong ?



I have an example of roof load calculations - from the British Plastics Federation Code of Prctice, (top right column) found here: http://postimg.org/image/y5tyi0bsr/

I have consulted these two maths forums - and they confirm the equation is incorrect, see here:

I have come here to hopefully get a structural engineers view on this simple equation mistake, maybe there is something I am missing - and it is not a mistake , be interested to get any opinions.


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