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V-factor

I hope this is not a dumb question...but what exactly is the V-factor in the 2009 IECC. I shows up several times in Section 4 for example, Sec 402.1 .3 V-Factor Alternative. I think it is the same as the U-factor....but why are they referring to it as V-Factor.

Thanks....

Asked by Bruce Friedman
Posted Jan 15, 2013 7:24 PM ET

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4 Answers

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1.

Here is what my 2009 IECC says: (I don't have a "V")
402.1.3 U-factor alternative. An assembly with a U-factor equal to or less than that specified in Table 402.1.3 shall be permitted as an alternative to the R-value in Table 402.1.1.

Answered by Armando Cobo
Posted Jan 16, 2013 9:47 AM ET

2.

Bruce,
I agree with Armando. Perhaps it's time to get bifocals?

Answered by Martin Holladay, GBA Advisor
Posted Jan 16, 2013 10:00 AM ET

3.

MIne says:

402.1.3 V-factor alternative. An assembly with a V-factor equal to or less than that specified in Table 402.1.3 shall be permitted as an alternative to the R-value in Table 402.1.1.

See attached screen shot...

I already have the bifocals..... :)

I am referring to my PDF version of the IECC 2009.....I have not checked by book version yet but I will...

Screenshot_1_16_13_5_07_PM.jpg
Answered by Bruce Friedman
Posted Jan 16, 2013 6:01 PM ET

4.

Bruce,
Looks like a typo...

Answered by Martin Holladay, GBA Advisor
Posted Jan 16, 2013 7:01 PM ET

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