Oldun, firstly and more importantly I am sorry to hear that you have been having some "bad days". hope you don't have to many more.
Thank you for all the details you have given me in your post, it is mind boggling how one person can know so much, so thank you once again. I rang the architect on the way home from work and asked for verification of the storey height pointing out that the drawings weren't much use and whether there were any working drawings, as you suggested. He didn't know what I meant by storey height, so had to explain, I offered to heights 2.4 which I scaled and 2.1 which made more sense, he replied with, it will be whatever the storey height in the house is! In the house it is 2.4, so I went onto to say that even with 5x2 rafters we are to close to the underside of the existing gable soffit. Oh Yeh, but its only a drawing was the response.
The contractor and I had already discussed on site bringing the rear of the larger salt box roof into line with the existing house which I offered to the Archi, he is not to happy with this approach, something to do with settlement and sag cos they are pantiles and may lift when the new roof settles?! Yet to be resolved.
I also asked about the flank wall and the lack of anything to fix the tiles to above the rear of the smaller salt box roof. He said he thought I would be build a sort of stud wall off of the joists that are running along side the rafter to the small salt box roof! "FFS"
Again I queried what joists I was expected to put in to take the span of some 6.5 meters, and to take the load of some sort of stud wall that would be supporting a purlin should we opt for a more sensible rafter size.
Mr Archi is coming to the site tomorrow for a meeting to go over all of this as the only responses I seemed to get were, ummm, well, I see, its only a drawing.
HAP = Height above plate after the birdsmouth has been cut, subsequently pushes the ridge board up higher.
Hypotenuse, I know what this is but I do use a ready reckoner called the Bible by someone I cant remember. but I can fathom rafter length by the square root method if I leave my book at home.
Pitch Line? I think I do, but I am not sure.
I think my book of Eurocode 5 span tables is coming by Royal Snail, not arrived yet, I may not understand it so yes I will take you up on your offer should I get stuck.
Thanks Oldun, will keep you posted, off for a meeting and a chat with the SE, will keep you posted.