Michael Reynolds is so right about trying to keep things simple. One change to his basic plans does cause a lot more work. We don't mind about this because we think the change is worth it, but it really is something to consider before going off plan.
To prepare the roof beams where they sit on the central beam we have to cut notches into them so they slot together and flatten off their bottoms so they don't roll. Dave has been talking to Joseph who is a carpenter by trade and is building his own earthship in Northern Spain. He has given us an idea of how much we need to overlap the beams without compromising strength, thanks Joseph.