Hi,
We have a CI renovation for a portion of a larger base building. The base building controls the HVAC completely (we will be doing no work to it) and we will not be touching the building envelope. Unfortunately both the envelope and HVAC system are old and below 90.1-2010 standards.
1. Can we achieve the pre-req (and get credit points) through Option 1 - Simulation by installing high performance lighting:
a) Can the existing envelope be used in the baseline model, ie. the same in the baseline and proposed models. I saw this addenda (https://www.usgbc.org/leedaddenda/10454) but it also seems like most posts so far in this forum say that you must model the baseline according to ASHRAE without any existing elements.
b) Can the existing HVAC system be used in the baseline model if HVAC is outside our scope of work ?
2. Do we need to meet envelope and HVAC 90.1 mandatory provisions to achieve the pre-req and credit?
ie. If our base building does not have a continuous air barrier or a vestibule say, does that exclude us from LEED as we can't meet the pre-req?
Thanks for all your help!
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
May 21, 2018 - 10:06 am
1a. It appears that you need to model the ASHRAE baseline in both models. I don't think this is good practice but that is what the requirements say.
1b. Yes you should model the existing HVAC.
2. No you only need to meet the mandatory provisions for this items within your scope of work.