I can not tell, from either ASHRAE 90.1-2007 or from the LEED User's Manual, what U-value I am supposed to use for the baseline vertical glazing. Each referenced standard states "...match appropriate requirements in Tables 5.5-1 through 5.5-8." In that table there list 4 types of vertical glazing.
Let's say I have a building with 40% glass. In the proposed design there is a room with an perimeter wall, but no glass. In the baseline model, I am to arbitrarily add 40% glass to this wall, but I do not know what the appropriate U-value of the glass should be. Am I missing something here?
To be more specific, I am in climate zone 5A.