Roof Overhang and mullions

1) The prescriptive method only works for buildings with simple geometry, so it doesn't account for deep overhangs. You'll want to use Option 1, Simulation, or Option 3, Measurement, to properly account for the effects of the overhang. 2) Although the Reference Guide isn't clear on the question of whether to exclude mullions and frames, I believe many people have used overall window dimensions rather than the precise area of glass, though I believe both have beeen accepted. 3) Pages 549 - 551 in the BD&C 2009 Reference Guide include the language for all 4 options to provide sunlight redirection and glare control, and page 555 gives more detail on types of glare control devices. 4) Yes, the meeting room would be considered a regularly occupied space.

2. In good practice, the mullion/frame shall not be included. However, since the frame area is usually insignificant compare to overall windows area, many people still include in their calculation because it may not affect significantly in your overall calculation. If the building has a large size frame such as a door with glass in its center, the frame area must be excluded.