I will be doing the installation, I need the drawing made by a PE to get the permit process started by my employer for our site. Rest assured, wood screws will NOT be used anywhere.From what I've seen, if it's a single layer of shingles 2" screws, double layer they use 3"
Beltsville.What type of roof and slope, flat etc.
I've done many non- penetrating mounts on commercial buildings.
Where's the project?