[Bldg-sim] LEED and existing envelopes

Anne Juran juran at summerconsultants.com
Tue Oct 11 11:02:19 PDT 2011


I find existing envelopes always tricky because the information is not
delivered in the clearest manner.  However, I think in this case the
reviewer is correct, based on 90.1 Table G3.1.5 item f under "Baseline
Building Performance" and page G-17 of the User's Manual.  Also, in item c
they explicitly state that it applies to new buildings and additions, but do
not list existing (other than the little blip about alterations and 5.1.3.)

 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of James Hansen
Sent: Tuesday, October 11, 2011 10:23 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] LEED and existing envelopes

 

I know this has been covered before, but I just received the following
comment from a GBCI reviewer for a v3 Core and Shell project I'm working on.
The project is basically an existing 5-story warehouse with almost no
windows.  Part of the renovation is adding windows.  The comment is as
follows:

 

Table 1.4.1B indicates that the window-to-gross-wall ratio is identical in
both cases; however it is unclear whether any fenestration was added or
removed as part of the renovation. The baseline ratio must reflect the ratio
as it existed prior to the renovation and the proposed ratio must reflect
the ratio as it exists after the renovation. Revise the Baseline and/or
Proposed cases as necessary so that the window-to-gross-wall ratio is
accurately modeled and provide a revised prerequisite form and updated
energy model output summaries as necessary. 

 

I didn't think that this was the case - I thought that if you had an
existing building, any EXISTING-TO-REMAIN windows would show up as the
existing window type, but any NEW windows in the proposed alteration would
be matched in the baseline model and comply with the Table 5.5 requirements.
Meaning the WWR remained the 1:1 as long as it was < 40% glass.

 

I think this is just a matter of educating the reviewer on our building, but
I wanted to make sure that there hadn't been a shift in how GBCI reviews
existing buildings.

 

Thanks!

 

GHT Limited
James Hansen, P.E., LEED AP
Senior Associate
1010 N. Glebe Road, Suite 200
Arlington, VA  22201-4749
703-243-1200 (office)

703-338-5754 (cell)
703-276-1376 (fax)

www.ghtltd.com <http://www.ghtltd.com/> 

 

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