OK here goes, I just built my first roof, its 125 square meteres and
has 4 different interceting ridge lines, oh, and the walls arn't
square.
I had a ridge beam, so my rafters rested on the ridge and the wall
plate. I put the first rafter up, and marked it, cut it, and supprise
myself when it fitted. I then measured the position of the cuts on all
the rest, and cut away, a few days later I had one section done.
I guessed 5 days work before I started, it took neerer 25 days, the
hip jack rafters were taking 3-4 hours each to get right.
What I would change
1) use the smallest timer possible, I used 6x3 green dougals fir, at
15 foot long it weights too much to mess arround with.
2) I would get the walls parellel, and also parallel to the ridge, I
would take much (like days worth) care about this.
3) I would buy a decent jigsaw to do the cuts, the chop saw was a pain
in the arse with wood that big and heavy.
Wihat I did right
1) I purchased too much wood - and used it all.
2) I did the biggest bits first, so any mis cuts could be reused
3) scaffold - lots of it, I can't do a good job if I am scared of
falling.
I also used a pile of battons to place up on the roof, to give me an
idea of what I was aiming at, this really helped.
I have a book, which I can't remember the title of, but amazon have
several on framing roofs - it helped quite a bit, lots of good
pictures !!
Rick