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Old 11-21-2011, 10:17 AM   #1
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Living Room Wall


I have one wall in the living room to the outside of the building about 11 foot long and 8 foot high.

It was once a door way to the outside and was closed in apparently not that well done

The walls do not have the mil plastic between the sheetrock and studs like the new buildings are getting.

I believe it has R19 in the walls but because it's like 45 degrees and freezing I'm starting to wonder.

I'm going to redo it but since I just remodeled the inside of the living room tearing off the sheetrock is not an option.
I'm going to remove the siding and plywood from the outside to get access.

I used this method for another area but put in 2" Foam board with R-10 value turned out to not be super effective.

Question is :

Do I need to put in plastic on this one wall?
Should I opt for R19 faced instead?
If R19 is installed what other things can I do?
Should I install outside WRAP before closing it up?

any feedback would be great.

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Old 11-21-2011, 11:38 AM   #2
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You need to be mindful of the vapor retarder levels and be sure that you don't have two on either side of the wall.

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Old 11-21-2011, 12:01 PM   #3
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Thanks I'm aware of the vapor retarder process can cause moisture in the walls, but I am also aware of a builder who puts on wrap on the outside behind the siding and 6 mil plastic behind the sheetrock.
This to me sounds bad.

Since my room doesn't have plastic behind the sheetrock I am opting for wrap on the outside since I am coming at this from the outside.

Also we only have cold walls on one wall so I might find the insulation is done wrong or something else bizarre.
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Old 11-21-2011, 01:11 PM   #4
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Housewraps are not vapor barriers (Class 1 vapor retarder) in this case.

They are vapor permeable so drying can still happen to outside.

Depending on the foam that you use and the thickness, you will have a vapor barrier on the outside of the home.

If you don't have plastic beneath the drywall, you should be fine.
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Old 11-21-2011, 01:18 PM   #5
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Quote:
Originally Posted by Windows on Wash View Post
Housewraps are not vapor barriers (Class 1 vapor retarder) in this case.

They are vapor permeable so drying can still happen to outside.

Depending on the foam that you use and the thickness, you will have a vapor barrier on the outside of the home.

If you don't have plastic beneath the drywall, you should be fine.

Knowing that foam board is a lower R value (10) at 2" thick does it make more sense to use batts insulation and house wrap or just to install foam with the house wrap
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Old 11-21-2011, 01:42 PM   #6
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http://www.greenbuildingadvisor.com/...-outside-house
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Old 11-21-2011, 01:50 PM   #7
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Originally Posted by Windows on Wash View Post
thanks I seen this online but I am using an existing structure and will be using foam inside of the cavity walls, I did this already on a outside porch while it helped it didn't stop all air but it didnt cut it down dramatically.
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Old 11-21-2011, 02:49 PM   #8
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If you are removing the siding from the exterior, you should put a rigid foam across the exterior prior to re-siding to interrupt the thermal bridging and resultant drop in R-Value.

Using foam for inside the wall cavity is probably more trouble than it is worth between all the cutting and fitment. If you want to use foam, buy a 600 board foot spray foam kit and just spray the inside wall from the back side.

High density fiberglass or mineral wool is probably just as well.

I would put in cellulose, mineral wool, or unfaced fiberglass (high density), cover the exterior with a rigid foam, tape the seams, and re-side/cover.

Make sure you seal up the air barrier (drywall) from the backside with caulk/foam to prevent any air loss from the structure.
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Old 11-27-2011, 09:54 PM   #9
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I've posted some pics of before and after it's working real well now

BEFORE
http://imageshack.us/photo/my-images/193/img0035rj.jpg
http://imageshack.us/photo/my-images/39/img00341.jpg

AFTER
http://imageshack.us/photo/my-images/854/img00401.jpg
http://imageshack.us/photo/my-images/38/img00391f.jpg

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