[Equest-users] Spandrel R value

[Singhal, Harshul]

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 façade 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

<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>

The information in this email and any attachments may contain

confidential information that is intended solely for the

attention and use of the named addressee(s). This message or

any part thereof must not be disclosed, copied, distributed

or retained by any person without authorization from the

addressee. If you are not the intended addressee, please

notify the sender immediately, and delete this message.

<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20140903/b8c9e129/attachment.htm>