Couple questions:
1) I have a deep overhang on a building we are designing. For this credit what do I do with this roof overhang? Does it affect square footage of windows or VLT values?
2) For window square footage do I exclude window mullions and frames?
3) Are glare control measure required for this credit or any of the other LEED requirements? If so where do I find this in the reference manual?
4) I also have a meeting/multi purpose room that will be used perhaps not full days but will be used every day for meetings, weddings, and educational purposes. I think it does (but wanted expert advice) but to be sure, does this constitute as a ‘regular occupied space’ and thus I should be able to use it in these calculations?
Thanks a lot for all the good info I find on this website
Lee
David Posada
Integrated Design & LEED SpecialistSERA Architects
LEEDuser Expert
1976 thumbs up
August 10, 2010 - 7:29 pm
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.
Eddy Santosa
Director of SustainabilityDBR Engineering Consultants
376 thumbs up
August 12, 2010 - 12:39 pm
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.