Discussing stuff with Mark Boyle, my project super. He's absolutely wonderful, and he gets nervous when we're 1/4" off. I like that in a project super. This house is built to very small tolerances, based chiefly on mathematical formulas . . . that actually work! We have two sections of roof, 1 is 1:12 to the south, the other is 1:8 sloping east and 1:24 sloping north. That creates the wonderful large window over the front entry. It's just geometry!