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knowing that <br>
<br>
1) appendix a, section 6.1, references that "For the purpose of Section
A1.2, the base assembly is a slab floor of 6 in. concrete poured
directly on to the earth ..." meets the requirement for an unheated
slab f-factor of 0.73, and<br>
2) section a6.3, f-factors for slab-on-grade floors, a.6.3.1 states: "<i>F-factors</i>
for slab-on-grade floors shall be taken from Table A6.3", and<br>
3) section a6.3.2 states: "These <i>F-factors</i> are acceptable for
all <i>slab-on-grade floors</i>."<br>
<br>
does the "all slab-on-grade floors" really mean any thickness of
slab-on-grade? i.e. section 6.1 references a 6-inch uninsulated slab
meeting the 0.73 f-factor requirement, but per sections a6.3.2 and
table a6.3 a 4-inch uninsulated slab (or an 8-inch uninsulated slab)
would also meet the 0.73 f-factor requirement. so why would section
a6.1 specify a 6-inch slab when any slab thickness will suffice? the
user's manuals (both years) just refer to table a6.3 for f-factor
values.<br>
<br>
the state of washington has a similar section in its energy code (see
link below), page 41, table 4-2. section 1003.2 (also page 41) lists
"All on-grade slab floors as assumed to be 6 inch concrete poured
directly onto the earth." note that on page 40, table 10.1, the
f-factors decrease the deeper the below grade the slab-on-grade floor
is.<br>
<a class="moz-txt-link-freetext" href="http://ftp.resource.org/codes.gov/wa_energy.pdf">http://ftp.resource.org/codes.gov/wa_energy.pdf</a><br>
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