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Old 06-20-2008, 09:22 AM   #1
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Framing and Insulation


I am buying a cabin package from Menards and the original design calls for 2x4 exterior walls. I was assuming I would have to upgrade to 2x6 for the better insulation value but am now wondering if I would be better off to stick with the original plans, use the 2 x4 walls and r15 insulation and then add some styrofoam insulation on the outside. Haven't calculated the costs differences and was thinking the foam would provide a better wind seal. Any opinions are appreciated.

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Old 06-22-2008, 11:47 AM   #2
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Framing and Insulation


maybe go 2X6 2' OC, then spray expanding foam insulation for monster R value.

pretty sure you use less lumber this way, and get much more R value (but more expensive insulation job).

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Old 06-22-2008, 03:43 PM   #3
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Framing and Insulation


Icynene foam would be a great option, but it is expensive. I wouldn't advocate 2' oc studs...The cost savings is insignificant, and it doesn't offer any other advantages.

Foam sheathing will certainly help if you insulate the walls conventionally with batts. Another insulation option is blown-in cellulose...Great product.
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Old 07-09-2008, 03:23 PM   #4
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Framing and Insulation


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Originally Posted by thekctermite View Post
Icynene foam would be a great option, but it is expensive. I wouldn't advocate 2' oc studs...The cost savings is insignificant, and it doesn't offer any other advantages.

Foam sheathing will certainly help if you insulate the walls conventionally with batts. Another insulation option is blown-in cellulose...Great product.
icynene is open cell and likely dissolve in 5 - 7 years
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Old 07-09-2008, 03:50 PM   #5
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Framing and Insulation


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icynene is open cell and likely dissolve in 5 - 7 years
Where on earth did you get that information?

Here's an informative link to the manufacturer, where you can get some actual accurate information.
http://www.icynene.com/InsulationSystem.aspx
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Old 07-09-2008, 03:53 PM   #6
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Framing and Insulation


Here's a comparison chart showing Icynene versus other types of insulation (from the Icynene manufacturer)...

http://www.icynene.com/assets/Produc...risonChart.pdf
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Old 07-09-2008, 06:18 PM   #7
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Framing and Insulation


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Originally Posted by shimp View Post
icynene is open cell and likely dissolve in 5 - 7 years
There are many types of foams on the market, and for general discussion, only the density and cells are used to determine what you are buying. Closed cell, 2lb. foam is really tight material, and rarely used to fill a wall cavity completely, due to cost, and effectiveness. Open cell foam is what used to be featured on the home shows where is was sprayed in the cavities and then shaved off flat. Not as effective, and I doubt anyone uses it now.

The closed cell provides a perfect air seal, and does not break down readily, even under UV exposure.

If you think this product isn't tough, just think about the bed liner in a pick-up truck....it is the same base chemical process without expansion, polyurea.

The down side to spray foam is cost. About double what we can do with sprayed cellulose, and before you even say it, cellulose does not "settle" in the wall cavities when applied correctly, it is glue set.
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Old 07-15-2008, 06:18 AM   #8
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Framing and Insulation


stick with 2x4 and use Insulated siding over ply sheathing, with blown-in cellulose look great, and nice Rvalue.

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