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Old 07-29-2012, 07:33 PM   #1
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i am putting in new ceiling drywall. i want to blow in a bunch of cellulose insulation. is 1/2" ok. 16" oc. oh, wait. i am sistering 2x6's to the old 2x4's. so it will be less that 16"oc.

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Old 07-29-2012, 08:08 PM   #2
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Yep--You will be fine with 1/2 inch----it's done all the time---

If you are not going to use a roll insulation with a vapor barrier---you will need to add a vapor barrier between the joists and the drywall---

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Last edited by oh'mike; 07-29-2012 at 08:46 PM. Reason: typo
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Old 07-29-2012, 08:30 PM   #3
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ok, 1/3 it is, as i already have it.

VB, i had not considered that. what is recommended ? that HD or manards has.
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Old 07-29-2012, 08:36 PM   #4
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lol. how did 1/2 turn into 1/3 ...
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Old 07-29-2012, 08:47 PM   #5
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TYPO___1/2 inch----need to get a new set of eyes!
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Old 07-29-2012, 08:52 PM   #6
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yeah, i typo'd too.

now , what about the VB ?
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Old 07-30-2012, 07:05 AM   #7
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We need an insulation person here---I always use faced bats--I don't know what would be an accepted vapor barrier---sorry---
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Old 07-30-2012, 07:16 PM   #8
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i've always put up a 6mm vapour barrier, boarded the ceiling then had the insulation blown in
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Old 07-30-2012, 08:30 PM   #9
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Quote:
Originally Posted by oh'mike View Post
We need an insulation person here---I always use faced bats--I don't know what would be an accepted vapor barrier---sorry---
i have been doing research. it looks as if a VB is not needed, other than the paint (a few layers). in fact, it looks as though VB's are going out of style.
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Old 07-31-2012, 11:27 AM   #10
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Quote:
Originally Posted by Fix'n it View Post
i am putting in new ceiling drywall. i want to blow in a bunch of cellulose insulation. is 1/2" ok. 16" oc. oh, wait. i am sistering 2x6's to the old 2x4's. so it will be less that 16"oc.
5/8" is the standard according to the Gypsum guide book. and code in 99.99% of places.
Never mind you got less then 16"oc you will be fine.

Last edited by Nailbags; 07-31-2012 at 11:30 AM.
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Old 07-31-2012, 11:32 AM   #11
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Quote:
Originally Posted by Fix'n it View Post
i have been doing research. it looks as if a VB is not needed, other than the paint (a few layers). in fact, it looks as though VB's are going out of style.
Yep after tape and mud PVA primer texture and then PVA over that and paint. Vapor retarder.
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Old 08-01-2012, 08:39 PM   #12
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ok, guys. how about "lightweight drywall" ? is that ok for a ceiling ?
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Old 08-01-2012, 09:02 PM   #13
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Yep---love the stuff----your back will thank you---
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Old 08-01-2012, 09:31 PM   #14
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Quote:
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Yep---love the stuff----your back will thank you---
THANX , man i was hoping to hear that ! yes, my back did thank me, today. as i brought home 7 sheets of it. and i have a bunch more, over the next few months, that i will be working with. i really could tell the difference.
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Old 08-08-2012, 01:03 AM   #15
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sorry to butt in-i am doing the ceiling too. so 1/2 is ok no need for 5/8th it looks like we decided?

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