3/8 drywall, or 1/2 drywall...how much cellulose?


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Old 04-26-14, 07:14 PM
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3/8 drywall, or 1/2 drywall...how much cellulose?

Hello,

I've got what appears to be 3/8 drywall on the walls, and 1/2 drywall on the ceiling...question is, how much cellulose can this drywall hold with studs on 16 O.C?

Currently have approx. 4" of batting in between the joists now, and I plan on blowing cellulose on top of this.

Thank you!
 
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Old 04-26-14, 07:23 PM
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The weight of the insulation won't compromise the 1/2" ceiling rock.
 
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Old 04-26-14, 07:38 PM
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Thank you Chandler...if I'm wrong, and the ceiling is comprised of 3/8 insulation, will this be a problem? I plan on installing close to R-49 total in the attic.


My next question is I have a cape cod, and I've got two crawlspaces on each side of the upstairs.

What's the recommended level of insulation to be installed on each side of the kneewalls, and above my lower lever ceilings?

Thanks again.
 
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Old 04-26-14, 07:48 PM
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Old 04-26-14, 09:34 PM
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What's the recommended level of insulation to be installed on each side of the kneewalls, and above my lower lever ceilings?
Assuming you're talking about the kneewalls and ceiling areas next to conditioned living space, you install the same amount as you co on any other wall or ceiling.

To find the best level for your house, you can run the ZIP Insulation Program from Oak Ridge National Laboratory.
 
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Old 04-27-14, 03:59 AM
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the ceiling is comprised of 3/8 insulation
Not clear on this. Originally the ceiling was 1/2" sheetrock. 3/8" won't work on a ceiling as it will sag too much. 3/8" insulation ain't much
 
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Old 04-27-14, 09:36 AM
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Sorry, 3/8 drywall. I can't tell 100. It's almost like the edges of the drywall are beveled. It's most likely 1/2inch.

More than likely it's 1/2 inch.

Thank you
 
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Old 04-27-14, 09:56 AM
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The long sides of drywall are beveled to make finishing easier [the tape/mud lay down inside that bevel. The best place to measure is in the middle of a sheet - maybe at a light fixture. Like Larry, I've never heard of anyone trying to get by with 3/8" drywall on a ceiling.
 
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Old 04-27-14, 06:04 PM
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Thanks for the replies. It looks like I'll be ok to put R-49 on top of 1/2" drywall using cellulose?

This site is invaluable. Thanks again
 
 

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