The team is requesting that you please verify the meaning of the sentence in ASHRAE 90.1, Table G3.1 regarding baseline envelope requirements for existing buildings.."For existing building envelopes, the baseline building design shall reflect existing conditions prior to any revisions that are part of the scope of work being evaluated". Please confirm if this means that the walls, roof, windows, etc for the baseline is to be modeled to match the existing conditions NOT according to the values in Table 5.5-1 thru 5.5-8.
If an existing envelope component is untouched, the baseline is as that component exists. However, if an existing component is modified, the baseline needs to meet the requirements for alterations in Section 5.1.3.February 28th, 2011 update: This ruling is considered invalid and may not be used in a certification application by any project team. Its continued inclusion in the database is for reference purposes only. Applicable Internationally.