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Old 03-27-2013, 10:04 AM   #1
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Insulating Existing Interior Walls


Hello,

I am trying to figure out how much blown in insulation I need per sq ft for an existing interior wall.

Thank you

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Old 03-27-2013, 10:16 AM   #2
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Insulating Existing Interior Walls


Going to need more info and your location add to your profile.
Go to Quick links to edit.
No one here can see your house.
How deep, how tall and wide ECT.
http://www.energystar.gov/index.cfm?...sulation_table

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Old 03-27-2013, 11:07 AM   #3
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Insulating Existing Interior Walls


Hello,

didn't know that there is a R-Value for existing interior walls too.
What information would be needed?
I thought there would be an approx. amount of blown-in insulation per sqft for empty interior walls.
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Old 03-27-2013, 11:40 AM   #4
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Insulating Existing Interior Walls


And how would anyone here know just how thick these walls are or what type blown in your going to use unless you share the info?
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Old 03-27-2013, 11:57 AM   #5
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Insulating Existing Interior Walls


Sorry, but I am new to this and if I bother you with my inexperience please take my apology.

I think these are regular 4" walls with a reular height of 8'.
Type of blown-in insulation woul dbe cellulose.
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Old 03-27-2013, 04:33 PM   #6
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Insulating Existing Interior Walls


for soundproofing or separating thermal zones?
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Old 03-27-2013, 04:36 PM   #7
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Insulating Existing Interior Walls


A little bit of both. But that wasn't my question.

Thank you
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Old 03-27-2013, 04:52 PM   #8
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Insulating Existing Interior Walls


I am well aware that wasn't your question, but your application is going to change depending on what your desired final result is buddy
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Old 03-27-2013, 04:56 PM   #9
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Insulating Existing Interior Walls


if thermal is the idea, you need to densepack. if sound is the idea, you want the cellulose a little loose, like a pillow.

Anyway, give me the width of the walls, and I will tell you how many bags you need to densepack. already have the height and depth, so just the width.
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Old 03-27-2013, 05:02 PM   #10
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or this is even easier. as long as your measurements are accurate above, you will need a little more then 3 and half bags for every 10 feet, assuming you are using 25 lb bags.
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Old 03-27-2013, 05:08 PM   #11
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Oh wow, thank you very much. That is very accurate.
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Old 03-27-2013, 05:08 PM   #12
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I would use Dense pack insulation if your going for sound and thermal zoning. just know there is settling with lose fill so you might want to check out doing a dense pack less settling.
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Old 03-27-2013, 06:04 PM   #13
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The number I gave him is for densepacking, minus a little for framing members and the fact that if you haven't densepacked before, your not going to get it as tight as it should be. but he should find a happy median with this.

If it is truly a densepack, it will carry the vibrations and have no effect on noise reduction, and its not like we are trying to control a 30 or 40 degree temp difference as you would be on exterior walls. also, much less opportunity for moisture intrusion on the interior walls
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Old 03-27-2013, 09:27 PM   #14
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Thank you. I am trying to find where to buy dense pack, but google gives me only installation instructions.
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Old 03-28-2013, 08:28 AM   #15
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Be aware that dense packing is not a great DIY job. Not only are the blowers that you get as rentals equip to dense pack, it is an acquired skill that takes a good, long time to get good at.

Dense packing is usually a job for the pros.

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