Dear all,
This covers more than just ventilation but as this is the most important I put all facts and questions down here.
An existing building from the 1970s is undergoing construction works. The client would like to certify the building and is seeking our advice. The works will mainly comprise a complete facade replacement and some work on none load-bearing walls. All HVAC systems and plants, distribution and so on will remain unchanged as far as possible.
According to the definitions in the Rating System Selection Guidance June 2011 this is a major renovation and the project would certify under CS Major Renovations.
Probably some of the systems are not compliant to ASHRAE 90.1-2007, but in most sections there are exceptions for existing systems that are not replaced or altered. So there seems to be no problem here, correct me please if I'm wrong.
We are sure that the ventilation rates are not compliant to ASHRAE 62.1-2007 in some places. There will most probably be no space to upgrade the system to ASHRAE 62.1, especially in the case of 5 underground parking decks. I can't find an exception similar to 90.1 in the 62.1.
Does anybody know of exceptions especially to ASHRAE 62.1 or a USGBC document / policy that allow the certification of this building (assuming all MPR and other prerequisites plus enough credits are met)? Or is this a project that just cannot be certified at all?