I decided to build the roof with a 45˚ pitch, mainly because it was easy to calculate and mitre. But it has other advantages. The floor of the attic is 7.5 feet across and 3.5 feet high, so there's lots of space for the storage of sacks of flour and the hiding away of appliances. As I put the roof up it suddenly seemed very tall. I had already calculated the height but seeing it was a little scary. 'Can I even drive down the road with a house that tall?' is what I thought. But it's exactly the height of a semi, 13.5 feet, so it should be OK. Tomorrow a little rain is coming in, so I wrapped it up in tarps for the night.