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Table 502.2(1) 2009 IECC

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docgj

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Oct 29, 2009
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123
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PA
Climate zone 6, Walls above grade, wood framed. My table shows R-13 + R-7.5. What does that mean? I understand that if ci is after it that it is to be continuous. Do both the R-Values go in the wall? Or do I have a typo in my book and the R-7.5 should be ci?

docgj
 
Re: Table 502.2(1) 2009 IECC

Not an expert on this but, I believe the ci is in reference to the foot note that is for allowance to substitute block walls in place of.
 
Re: Table 502.2(1) 2009 IECC

Looks like misprints to me. I'd treat the second number as continuous insulation.
 
Re: Table 502.2(1) 2009 IECC

Jake,

Could you check your copy for me?

Forest,

ci stands for "continuous insulation"

docgj
 
Re: Table 502.2(1) 2009 IECC

Mine reads the same, third printing.

Second number equals continuous insulation (ci)

Footnote c applies to above grade mass walls in climate zone 1 & 2

mj
 
Re: Table 502.2(1) 2009 IECC

ci is in yours? ci was omitted in my copy(second printing).

docgj
 
Re: Table 502.2(1) 2009 IECC

docgj said:
ci is in yours? ci was omitted in my copy(second printing).docgj
Click to expand...
ci is missing from many boxes, but not all.

Seems like a strange oversight, but enough of the boxes have it in to ASSUME the second number is ci.

mj
 
Re: Table 502.2(1) 2009 IECC

Never liked the "assume" thing with the codes.

Anyone else want to put their 2 cents in?
 
Re: Table 502.2(1) 2009 IECC

I know the second value is for continuous insulation but the footnote explains the "ci" as meaning you can sub a block wall in place of the continuous insulation.
 
Re: Table 502.2(1) 2009 IECC

Look at the top of footnotes...ci=Continuous insulation
 
Re: Table 502.2(1) 2009 IECC

docgj said:
Jake,Could you check your copy for me?

Forest,

ci stands for "continuous insulation"

docgj
Click to expand...
I have the 2nd printing of the combined IECC/ASHRAE. I'm with mj, enough cells have ci to assume they mean continuous insulation.

Footnote c only applies to mass walls in Climate Zone 1 Group R, and Climate Zone 2 other than Group R.
 
Re: Table 502.2(1) 2009 IECC

just had training on this last week, actually 10 hours of training in the last 3 weeks on the IECC 2009. The first is number is cavity, the second is continuous.
 
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