Hey Chris,

I could be mistaken, but I think part of the problem is that you?re
referencing 90.1-2013, whereas the LEED compliance ruleset (such as it is?)
is based on 90.1-2007, i.e. LEED v3. 90.1-2007 and 2010: both require
F-0.52 for that climate zone.

My advice would be to ensure the actual insulation situation is represented
in the DD wizards (i.e. 4ft of vert. R-20 = F-0.434), and rest
assured/document that your are modeling the appropriate F-factor, citing
the appropriate table in Appendix A if anyone is asking.

If you wish to differentiate the insulation levels between your baseline
and proposed models (in my experience, not often worth the effort but on
occasion relatively painless), I?d leverage a separately saved ?dummy?
model reverted back to wizards, and tweak the SOG inputs to match each
case. Doing this twice and saving separately, you?ll generate an
identically named set of perimeter/core underground floor constructions,
with varying material R-value properties for the outermost ?soils? layer
(named to match). This set of unique soil R-values is representative of
the construction inputs (and thereby F-factor) you specify in the wizards
for that project. Differentiating between your actual, developed
baseline/proposed models is then a matter of using one set of soil
properties vs. the other.

Does that help?

~Nick

*NICK CATON, P.E.*
*Owner*

*Caton Energy Consulting*
1150 N. 192nd St., #4-202

Shoreline, WA 98133
office: 785.410.3317

www.catonenergy.com

*From:* Chris Baker [mailto:CBaker at cci-alliance.com]
*Sent:* Tuesday, February 24, 2015 3:19 PM
*To:* equest-users at lists.onebuilding.org
*Cc:* ncaton at catonenergy.com
*Subject:* Problem with slab on grade F-Factor assembly max

Hello! My climate zone is 8. I?m modeling a slab on grade floor for part
of my building.

One of my shells (in both proposed and baseline) has a slab on grade
because it was a later addition to the building

It was existing prior to our renovation but needs to be modeled correctly,
nonetheless.

Table 5.5-8 (2013 version of ASHRAE appendix G) shows the assembly maximum,
unheated, F factor 0.434 (R20 for 48 in.)

My baseline F-factor should be .434

My baseline currently shows F-factor 0.52 (brown text)

My proposed currently shows F-factor 0.52 (brown text)

However, this is not an input that can be manually edited.

The baseline requirements of ASHRAE are telling me the F factor 4.34 cannot
be exceeded (assembly max value) but equest shows 5.2

And it cannot be altered (that?s even after running the compliance
analysis).

Both models have insulation down to 48? but the proposed model thickness is
much more (because of 5? EIFS continuing down below grade).

*Is there a way to change the Baseline F-factor to show .434 in compliance
with ASHRAE guidelines?*

*or am I stuck with submitting the models with 5.2 in both models and
F-factor is just pre-determined by the engine?*

Chris Baker
CCI CAD Drafter

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