Dave,
I have never done roofing, but I understand the principle of starting from the bottom & going up & staggering the length of the shingles along the tab lines. Can you explain the pencil lines on the sheathing in the picture below to me. I can understand the horizontal lines somewhat, but...
Fantastic post.
What do you use the EDM machine for ? I assume that it is an Electrostatic Discharge Machine, just wondering what you normally used it for at home ?