[Equest-users] LEED Fenestration Modeling Question

[David Reddy]

The NFRC CMAST database includes ratings for a growing number storefront 
and curtainwall products, where ratings are generated using the NFRC 
Component Modeling Approach (CMA).  These are project-specific ratings 
based on specific combinations of frame, glazing unit, and spacer, but 
if they match your proposed design, I would guess that LEED would accept 
these ratings as an acceptable substitute for your own WINDOW/THERM 
analysis.

http://cmast.nfrc.org/Product/ProductFind.aspx

David


On 4/15/2013 12:34 PM, Paul Diglio wrote:
> Thanks Bill, the comment you received is encouraging.
> Paul Diglio, CEM, CBCP
>
> 87 Fairmont Avenue
> New Haven, CT 06513
> 203-415-0082
>
>
> www.pdigliollc.com <http://www.pdigliollc.com>
>
>
> ------------------------------------------------------------------------
> *From:* "Bishop, Bill" <bbishop at pathfinder-ea.com>
> *To:* Paul Diglio <paul.diglio at sbcglobal.net>; 
> "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>
> *Sent:* Mon, April 15, 2013 2:45:18 PM
> *Subject:* RE: [Equest-users] LEED Fenestration Modeling Question
>
> Paul,
>
> I recently received the following comment in a LEED review for a 
> LEED-NC v2009 project:
>
> This implies that Window v6.3 calculations are acceptable in lieu of 
> NFRC ratings. The comment does not exclude the modeler from performing 
> the calculation.
>
> Of course, I have no idea if this is boilerplate language or if LEED 
> reviewers have discretion here. It is also possible that requirements 
> will become stricter for newer projects.
>
> Regards,
>
> Bill
>
> *William Bishop, PE, BEMP, LEED AP **|**Pathfinder Engineers & 
> Architects LLP*
>
> Senior Energy Engineer
>
> 134 South Fitzhugh StreetRochester, NY 14608
>
> T: (585) 325-6004 Ext. 114F: (585) 325-6005
>
> bbishop at pathfinder-ea.com 
> <mailto:wbishop at pathfinder-ea.com>www.pathfinder-ea.com 
> <http://www.pathfinder-ea.com/>
>
> PSustainability -- the forest AND the trees.P
>
> *From:*equest-users-bounces at lists.onebuilding.org 
> [mailto:equest-users-bounces at lists.onebuilding.org] *On Behalf Of 
> *Paul Diglio
> *Sent:* Monday, April 15, 2013 2:34 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] LEED Fenestration Modeling Question
>
> Folks:
>
> I am a bit confused when modeling unrated vertical fenestration for 
> the proposed model.  90.1 states that we need to use the values 
> determined in accordance with NFRC 100 or we can use the data in Table 
> A8.2 for vertical fenestration per Exception b, Section 5.8.2.4.
>
> If so, the values in Table A8.2 exceed the maximum allowed 
> fenestration u-values listed in Table 5.5-5 (my zone), so will this 
> not disqualify the proposed building model?
>
> I have often found it impossible to get the architect to supply the 
> NFRC assembly ratings of the glazing and field erected curtain-wall 
> systems.
>
> I have used the LBNL Window 6.3 program to calculate the vertical 
> fenestration ratings, but 90.1 Section 5.8.8.2 states that the 
> fenestration product shall have a permanently installed nameplate or 
> the manufacturer shall provide a signed and dated certification for 
> the installed fenestration.
>
> I don't see any wiggle-room where 90.1 allows the modeler to calculate 
> the NFRC rating of vertical fenestration.
>
> Saying that, I have submitted projects where I calculated the 
> fenestration assembly u-values without any kick-back from the GBCI.
>
> I am concerned that the reviewers will push this issue since it is now 
> clearly defined on the new Section 1.4 Table and if I submit my own 
> ratings I will end up remodeling the project and/or the proposed 
> building envelope will be rejected since it doesn't meet the mandatory 
> requirements of Section 5.4.
>
> Any thoughts?
>
> Thank you,
>
> Paul Diglio, CEM, CBCP
>
> 87 Fairmont Avenue
> New Haven, CT 06513
> 203-415-0082
>
> www.pdigliollc.com <http://www.pdigliollc.com>
>
>
>
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