I'm trying to design a Mansard Roof in the UK. Some timber data is given here that local building control allows:
As you can see for a 11° as in diagram below a clear span of 4.59m with C24 and 47x197mm timber is permisable is that correct Q1 (amended) did I get that right? and Q2 (amended) what would the other internal structure of it be?
Q3 (amended). I want to get a feel of the maximum roof size using the tables above and the sizes shown on the diagram to design; an answer using any non product based reference (including books, software, internet references) or design sugestions that would suite the diagram shown would be helpful.