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Old 11-30-2007, 10:21 PM   #1
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can I add insulation?


I have walls in my house that have just a real thin paperbacked insulation inside of them that doesn't even fill the cavity. The walls always seem to feel cold to the touch during the winter, can more insulation be blown in ? This is an old 50's ranch. I've added more everywhere else that I can; attic, crawlspace,jams. I even put in all new windows but these bedrooms still feel cold.

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Old 11-30-2007, 10:55 PM   #2
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can I add insulation?


I hate to say it, time to remodel those rooms. You are going to have to pull the drywall down to properly add insulation.

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Old 12-02-2007, 10:16 PM   #3
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can I add insulation?


There are people out there that can add blown in insulation to those walls... they won't guarantee even distribution but I had it done and it made a world of difference...
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Old 12-02-2007, 10:22 PM   #4
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can I add insulation?


I have one of the old Sears kit houses and I found this to be a problem once I started remodeling my house. I ended up tearing off the inner paneling and reframing the wall out with 2x4s just to make the walls have some thickness and able to hold more insulation.

I have pictures.

After I tore down the inner paneling.


After I framed:




Finished product:
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Old 12-02-2007, 10:33 PM   #5
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can I add insulation?


WALL framing thickness/WIDTH---- dictates your insulation options....
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Old 12-03-2007, 09:44 AM   #6
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can I add insulation?


Thanks for all the info, I'm not sure what I'll do yet. The cedar clabbord on the outside of the home is in such good shape I'd like to keep it instead of going with vinyl so I won't be doing anything from the outside It's only four walls so I guess eventually i"ll go for the tear out. Thanks again! timber
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Old 12-03-2007, 09:47 AM   #7
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can I add insulation?


It's not a good idea to add insulation on the inside (the warm side) of the existing paper back. Otherwise moisture from the air will gradually condense there if the paper has moisture resistance which it usually does.

When you tear off the drywall, you can leave the paper there provided you cut numerous slits in the paper, say about two inches apart and a foot long, staggered so the insulation and paper doesn't disintegrate. A new unslit layer of paper or plastic (may come with the new insulation) would be installed just before replacing the drywall.

If you don't remove the old insulation and the new insulation occupies less space than it should, the additional R-value is roughly pro-rated according to the space that it did occupy for minor squashing. For example R-12 insulation meant to go into a 3-1/2 inch space but only 2-5/8 inches (about 75%) of space was available, you would get about R-9 (about 75%) of R-value. If you squash it considerably, you get less than the rated value pro-rated. If blanket insulation is fluffed to occupy more space than it should, you will get a little more R-value but not as much as you would compute by pro-rating, and probably maxing out at 25% more than rated.

Last edited by AllanJ; 12-03-2007 at 09:52 AM.
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Old 12-03-2007, 12:08 PM   #8
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can I add insulation?


Allanj, sounds like you know a thing or two about insulation! Thank you.

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