Installing the sheathing for the roof, and then the shingles, was by far the most physically demanding task so far, made more difficult by the 12:12 slope of the roof, the fact that one of my ladders is too short and the other too long, and by the swarms of mosquitos that wait to attack until the moment when you are balancing on one foot, 10' in the air, with 20 lbs. of shingles in one hand, a hammer in the other, and a mouth full of nails. I was lucky that my good buddy John from down the road was able to help with this phase.