Hello everyone

For one of my office building project (70% total WWR which is almost 100% of conditioned wall & remaining 30% are spandrel walls). For ASHRAE compliance 40% WWR is used with R-15.6 (U 0.064) wall. For design case, recommended R value for spandrel walls is 12.6 which is lesser than code compliance. I know that as per 90.1 user manual spandrel walls should be treated as conventional walls for ASHRAE code compliance case but is there any exception which I am not aware of? Using R15.6 in ASHRAE & R12.6 in design case accounts for a chunk of penalty and I am looking for some "loophole" to avoid that. Please note that R value for design spandrel walls can't be increased due to limited thickness available. (3 inches). R values are suggested by fa?ade experts.

Thanks
Harshul Singhal
Project Consultant
Thornton Tomasetti
386 Fore Street, Suite 401
Portland, ME 04101
T 207.245.6060 F 207.245.6061
D 207.245.6074
HSinghal at ThorntonTomasetti.com
www.ThorntonTomasetti.com

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