[Bldg-sim] Existing Building LEED Baseline

4 posts / 0 new
Last post

I may be misreading one of your emails, but if you are doing a building
renovation to an existing building, even if you ARE changing out
windows, the baseline model retains the envelope characteristics of the
existing building. You don't have to bring the baseline windows up to
90.1 standards unless it is a portion of the building that is being
added under the proposed work.

Also, check the archives - I thought that some GBCI reviews of projects
have required the four orientations even for existing buildings.

James Hansen, PE, LEED AP

James Hansen's picture
Offline
Joined: 2011-09-30
Reputation: 200

James is correct regarding the windows - they should be modeled using the pre-renovation U-value and SHGC in the baseline case.

The baseline case should not be rotated for existing buildings, nor should it be rotated if the construction is an addition. The basis of the rotation requirement for new construction is to reward the project team for choosing the most efficient orientation for a building and this is not an option for existing buildings and additions.

Best Regards,

Gregg Liddick, EIT, LEED(r) AP

Gregg Liddick's picture
Offline
Joined: 2011-09-30
Reputation: 0

If a building is going under LEED NC, does it not have to be rotated even
if it is existing? I think the argument for this had something to do with
the fact that the AE team could still modify the building envelope to make
it more efficient.

My understanding was that if a building was applied under LEED EB then it
would not have to be rotated.

I could be very wrong though.

-----------------------------------------
Jack Vithayapun

Gregg Liddick
Sent by: equest-users-bounces at lists.onebuilding.org
03/12/2010 11:42 AM

To
James Hansen , Erik Dyrr ,
"omoltay at mimtarch.com" cc
"equest-users at lists.onebuilding.org" ,
"bldg-sim at lists.onebuilding.org" Subject
Re: [Equest-users] [Bldg-sim] Existing Building LEED Baseline

James is correct regarding the windows ? they should be modeled using the
pre-renovation U-value and SHGC in the baseline case.

The baseline case should not be rotated for existing buildings, nor should
it be rotated if the construction is an addition. The basis of the
rotation requirement for new construction is to reward the project team
for choosing the most efficient orientation for a building and this is not
an option for existing buildings and additions.

Best Regards,

Gregg Liddick, EIT, LEED? AP

Jack Vithayapun's picture
Offline
Joined: 2011-09-30
Reputation: 0

James is correct regarding the windows - they should be modeled using the pre-renovation U-value and SHGC in the baseline case.

The baseline case should not be rotated for existing buildings, nor should it be rotated if the construction is an addition. The basis of the rotation requirement for new construction is to reward the project team for choosing the most efficient orientation for a building and this is not an option for existing buildings and additions.

Best Regards,

Gregg Liddick, EIT, LEED(r) AP

Gregg Liddick's picture
Offline
Joined: 2011-09-30
Reputation: 0