19/08/08

Yesterday we started our brown paper drawing on oblique roofs. The drawing was worked off one of the frames that had been pre made and was drawn to half the size. we each had a different pitch to draw to and mine was 30 degrees. to start off with we drew the outline of the frame and then drew the centring rafters and the jack in. Next we drew in lines for the hips on the oblique end. once that was done we used the red book to find out the true height and the drew a line square off the top of the hip out the height. once that was done it was joined up to the bottom of the hip with another line forming a triangle. the first side made the plan length the second made the height and the last was the true length. we also had the plumb cut angle which was made up where the second and third line meet.

the same was done with both hips before we got onto the common rafters. to start off with we found the middle and put a line square off that the height and then joined it back to the plate. this gave us the plumb cut for the commons and the length. at first i thought all of it was pointless but once i got drawing i got my head around it and saw how useful it is. After doing this i wonder how i thought i could do it without the drawing