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Old 12-08-2011, 08:38 AM   #1
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adding 2x2 to 2x4 leaves me short of a 2x6 for R19 Do I have to add the full 2" to recieve credit for full R19 value for my energy calcs.


Last edited by Lon Huntington; 12-08-2011 at 09:10 AM.
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Old 12-08-2011, 08:42 AM   #2
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Correct.

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Old 12-08-2011, 08:54 AM   #3
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Thanks for the quick reply Do I have to fur a full 2" for full R19 performance
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Old 12-08-2011, 09:04 AM   #4
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Yes.

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Old 12-08-2011, 12:44 PM   #5
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how common is this practice?
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Old 12-08-2011, 04:24 PM   #6
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in renovtions where the existing framing is 2x4 and local codes dictate bringing the insualtion up to a minimum of r-19 quite often, especially if spray foam isnt in the budget.

locally r-24 is required, its the same thickness as r-19 but is a more densely wound insulation.

the problem with using 2x2's is that they are only 1 1/2 x 1 1/2" you need to add the full 2" thickness otherwise when the drywall goes on the insulation will compress which reduces its effectiveness. your better off buying 2x 6's and ripping them down. you will have waste but it can easily be used as fire wood or kept handy for ripping thinner furring strips
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Old 12-08-2011, 04:26 PM   #7
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Quote:
Originally Posted by lewisthepilgrim View Post
how common is this practice?
Not very common here in California, R-13 in 2 x 4 walls is standard and prescriptive in most places except perhaps the mountain communities.

In ther colder climates in other states it may be a more common practice.

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