Need A Vapor Barrier - Insulation - Contractor Talk

Need A Vapor Barrier

 
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Old 06-12-2011, 08:06 PM   #1
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Need A Vapor Barrier


Got an attic that I was going to use as livable rooms when I started out, so I insulated the ceiling below with fiberglass insulation without any vapor barrier. I done this just to muffle any noise was all between floors. Now money and family needs have altered those plans. I will not be using the attic as livable rooms. Problem is, I know I should have a vapor barrier on the ceiling below but dont, so what can I use as a vapor barrier. can I simply pull the insulation up from between the joists and install say maybe red rosin paper between the joists and then re install the un crafted insulation? Or is there something else, like plastic caulked to the joists?
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Old 06-12-2011, 08:10 PM   #2
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Re: Need A Vapor Barrier


they have paint on vapor barriers but i think 2 coats of oil based primer should work too

make sure to seal any penetrations like wire holes and the like

red rosin isn't a vapor barrier

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Old 06-12-2011, 08:13 PM   #3
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Re: Need A Vapor Barrier


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they have paint on vapor barriers but i think 2 coats of oil based primer should work too

make sure to seal any penetrations like wire holes and the like

red rosin isn't a vapor barrier
Humm, never heard of that. Is that just on the back side of the sheet rock, or do I need to do the joist sides as well?
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Old 06-12-2011, 08:17 PM   #4
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Re: Need A Vapor Barrier


What about just using kraft-faced fiberglass insulation? That's considered a viable barrier in the Chicago area.
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Old 06-12-2011, 08:21 PM   #5
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Re: Need A Vapor Barrier


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What about just using kraft-faced fiberglass insulation? That's considered a viable barrier in the Chicago area.
I could, but then I would have to purchase all new insulation. I already have enough but without vapor barrier. Thought maybe instead of wasting it all just install something for the barrier. If push comes to shove I could remove the uncrafted and install craft faced, then install the uncrafted 90 degrees to the craft faced insulation which would make it tighter. But I was just trying to use what I already had was all.
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Old 06-12-2011, 08:21 PM   #6
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Re: Need A Vapor Barrier


no bill paint it on the cieling not under the insulation

sw has a latex based one

http://www.sherwin-williams.com/pro/...vapor_barrier/
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Old 06-12-2011, 08:24 PM   #7
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Re: Need A Vapor Barrier


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no bill paint it on the cieling not under the insulation

sw has a latex based one

http://www.sherwin-williams.com/pro/...vapor_barrier/
Now that may be the ticket. The ceiling below is already primed and painted, so it makes me wonder if I can re paint using this paint over the old?
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Old 06-12-2011, 08:43 PM   #8
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Re: Need A Vapor Barrier


You should be okay with going over the existing paint. Here are a couple of other threads on the subject:

http://www.contractortalk.com/f94/va...r-paint-49618/
http://www.contractortalk.com/f18/wa...uestion-33616/
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Old 06-12-2011, 09:08 PM   #9
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Re: Need A Vapor Barrier


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Originally Posted by Tinstaafl View Post
You should be okay with going over the existing paint. Here are a couple of other threads on the subject:

http://www.contractortalk.com/f94/va...r-paint-49618/
http://www.contractortalk.com/f18/wa...uestion-33616/
Thanks. Appreciate it much.

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