We have an existing building being renovated. The existing building envelope does not meet ASHRAE 90.1-2007 criteria. If we want to get the credit for EAc 1.5, can we use the existing building envelope as the base line, or do we have to use the building envelope coefficients in ASHRAE 90.1-2007 as the baseline for our model ?
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Tristan Roberts
RepresentativeVermont House of Representatives
LEEDuser Expert
11478 thumbs up
November 22, 2012 - 8:35 pm
Robert, speaking solely on the basis of my reading of the LEED requirements, I think you would need to use 90.1-2007 as the baseline. There is no mention of a different approach for existing buildings in the credit language, as there is in other LEED rating systems. Also, this is a credit, not a prerequisite, so there is an expectation of strong performance.
Giuseppina Amorusi
Artelia Italia2 thumbs up
March 25, 2015 - 11:02 am
Hi Tristan, I have the same doubt as Robert. My project consists in a renovation of existing buiding (Core and Shell in which there is a renovation of external walls and replacement of fenestration). Which kind of structures should I have to use in the modelling of baseline building? I have red in ASHRAE 90.1 Appendix G (v. 2007) at Table G3.1 at point " f " that for Existing Building the envelope should reflect existing conditions. So which U-factor should I have to use? ASHRAE or Existing conditions?
Thanks