I'm working on a project where I am pursuing LEED EAc1 for an existing
building. As I understand it from the LEED-NC reference guide, as well
as from some snippets of 90.1, I actually model the baseline building as
is currently exists. The reference guide says:

"For existing buildings that are being renovated, the building envelope
design parameters for the Baseline Design should be modeled using the
existing (pre-retrofit) building envelope thermal parameters rather than
the ASHRAE 90.1 prescriptive building envelope requirements for the
specified climate."

So I'm using actual window areas, actual insulation values, etc.

My question is: if I'm using this exception, do I also no longer have
to do a simulation at the four different azimuth required by the LEED
EAc1 template?

I find 90.1, as well as the user's manual, fairly lacking in describing
how to apply Appendix G to existing buildings in general....

Thanks in advance!

James Hansen, PE, LEED AP