Hi all, i am having a loft conversion, had the first inspection today only to be told i need steels either end and 6x2's running between them, has any body got any ideas where i can work out the thickness of rsj's needed fast?? holding up builder till this is done, i dont really want to wait for a tech and pay him hundreds if it can be done another way, i am guessing that the span will be approx 6m. i reckon 8'' is enough but i need to show the council the calculations, any help would be much appreciated, thanks.