Codeman,
Since you are so helpful we have one last question on energy. As in the last request, the 2006 codes apply.
The client wants a non-permanent overhang that can be detached from the building during the winter months on a commercial building (office in climate zone 4). When it is attached, the overhang will have a projection factor of 0.40.
What is the maximum SHGC for the vertical fenestration that is shaded by the overhang. A reduction will help with costs.