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NC-2009 IEQc8.1:Daylight and Views—Daylight

Use of clerestories for IEQc8.1?

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Karen Stewart
President, LEED AP
EcoPotential
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38 thumbs up

After review of the requirements for IEQc8.1, it appears to me that light from clerestories is not allowed in the calculations for this credit. Am I missing something?

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Tristan Roberts
Representative
Vermont House of Representatives
LEEDuser Expert
7780 thumbs up

Thu, 02/24/2011 - 17:43

Karen, which path are you looking at? Clerestories should contribute to Options 1, 3, and 4, although I'm not sure about Option 2.

Thu, 02/24/2011 - 17:50

They do for Options 1, 3, and 4 as Tristan said. And they do for Option 2 if they are the only type of fenestration in the area and they are not obstructed by the ceiling. Option 2 was meant as a simple (read: cheaper) way to qualify VERY simple geometry.
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Karen Stewart
President, LEED AP
EcoPotential
LEEDuser Basic Member
38 thumbs up

Thu, 02/24/2011 - 19:40

Tristan, we were going for option 2. However, looks like we should pursue option 1 so we can include the clerestory. Jill, do you recommend a simulation software?

Thu, 02/24/2011 - 21:52

I can recommend a consultant. ;) If you have never used daylighting simulation software before, you will want to consider what it is worth to you to buy and learn the software vs. hiring a consultant. Find a consultant that has at least 3 years of experience with the software, knows what to expect from it, knows how to debug the results and can model complicated geometry without breaking the project fee. It is not plug-and-play technology.
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Erica Downs
LEED Consultant
The Green Engineer
LEEDuser Basic Member
188 thumbs up

Thu, 02/24/2011 - 22:15

Jill -- Ever used 3ds max software to model daylight? We know it is capable, just not sure it will give us exactly what we need to know for LEED. Thanks.

Thu, 02/24/2011 - 22:36

Sorry, I have not. Again, I would suggest weighing what it is worth to buy and learn the software vs. hiring a consultant.
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Eddy Santosa
Director of Sustainability
DBR Engineering Consultants
LEEDuser Basic Member
244 thumbs up

Fri, 02/25/2011 - 03:16

I agree with you, Jill. To run a daylight simulation is not difficult but to run correctly, it takes time to learn. Understanding the physic of light and daylight is also required. Otherwise, it will be garbage in and garbage out.

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