[Equest-users] LEED Review Comment for Appendix A constructions

[Cam Fitzgerald]

Pasha,

 

You are right that Table G3.1#4 does not specifically cite Appendix A, it simply says the Proposed model must be modeled as shown on the drawings or as built for existing envelopes. Since the envelope performance listed in Tables 5.5-x are prescriptive requirements, the reference you seek is in Section 5.5.3 which defines how to determine if the envelope meets the prescriptive requirement.

 

I cannot address your second question as to why you have not encountered this issue in previous LEED submissions, but it is not related to the new Table 1.4 form. This issue has been questioned since well before LEED 2009 was released.

 

Good luck,

 

Cam 

 

From: PKConsulting [mailto:pasha.pkconsulting at gmail.com] 
Sent: Friday, April 12, 2013 8:55 AM
To: Cam Fitzgerald
Cc: eQUEST Users List
Subject: Re: [Equest-users] LEED Review Comment for Appendix A constructions

 

Thanks Cam,   I couldn't find where it reads this in Table g3.1,   Could you give me a page reference please?   I need to provide my client with this reference info for their future projects.

 

Also can you explain why this hasn't been addressed on LEED projects in the past?   This is the first time I have received this comment on any of my LEED submissions.

 

Thanks,

Pasha

Sent from my iPhone


On Apr 12, 2013, at 5:45 AM, "Cam Fitzgerald" <cam at energyopportunities.com> wrote:

Good morning, Pasha,

 

Appendix G primarily provides very specific guidance for building the appropriate Baseline model to use as a benchmark to calculate the projected energy savings for your Proposed building as designed. Most of the guidance in Table G3.1 for the Proposed model indicates it must be modeled as designed. This is where appendix A comes in for the Proposed constructions. U-values  may only be calculated using the inverse of the sum of the R-values if each layer is continuous (e.g. uninterrupted by other materials such as steel studs or joists). Appendix A provides tables with the effective U-values for various common heterogeneous constructions. Depending on the construction, the overall U-value for the assembly can vary significantly from the U-value calculated by summing the U-value of the major components. The Appendix A assembly performance must be used for the Proposed constructions to accurately reflect performance of the building envelope. Hope this helps.

 

Have a great day!

 

Cam Fitzgerald

 

Energy Opportunities/a 7group company

 

 

 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Pasha Korber-Gonzalez
Sent: Thursday, April 11, 2013 6:00 PM
To: eQUEST Users List
Subject: [Equest-users] LEED Review Comment for Appendix A constructions

 

Hi --  hopefully others have run into this before.    We have a review comment that suggests that we need to revise our Proposed Construction performance values by reference of Appendix A constructions from 90.1 standard.

 

This is a new comment which I have not experienced LEED Reviewers addressing on past projects, and it seems to be in line with the release of the new Table 1.4 that is so interactive and also requires reference to Appendix A tables for proposed construction performance values.

 

I have re-read Appendix G and cannot find any required reference to using Appendix A performance values for proposed construction except for Fenestration that is Not NFRC rated.     Where does it state the requirement to use Appendix A values for all of the proposed envelope construction values??   Why is GBCI implementing this now, and it was never a factor before?

 

I need some education on this one please, I couldn't find any specific references on my own.

 

Thanks!

 

Pasha

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