DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Insulation and Radiant Barriers > Do i need to put a vapor barrier in the attic?




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Old 02-04-2014, 07:27 AM  
drewdin
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Default Do i need to put a vapor barrier in the attic?

I have patches of insulation in the attic, spots with some and some with without. I went into the attic to insulate above the bathroom with ROXUL batt insulation.

The guys at work today told me that I should have put a vapor barrier down before the batt insulation.

I did this on the exterior walls but the inspector told me that I didnt have to put it in the ceiling so I didn’t when i had the place gutted. I made sure to seal the holes in the attic but i didn’t use a vapor barrier?

Is it standard practice to put down a vapor barrier in the attic?



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Old 02-04-2014, 08:09 AM  
oldognewtrick
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No, you should not put a vapor barrier in the ceiling or attic area.



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Old 02-04-2014, 09:18 AM  
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Great, I'm glad I didn't. What are the reasons why I shouldn't?


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Old 02-04-2014, 09:28 AM  
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Depending on where you live. Where I am you do.

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Old 02-04-2014, 09:54 AM  
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If you have a proper exhaust fan in the bathroom, it will vent the moisture. Trying to put a vapor barrier down between the ceiling framing is hopeless ... and if moisture came through the ceiling, it would condense onto the drywall INSIDE the attic with no way to escape (attic colder than batherrom leads to condensation).

That wetness would mold and dilapidate the ceiling.

Cut your ROXSUL tight, fill the voids, celebrate your correct decision.

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Old 02-04-2014, 09:54 AM  
bud16415
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Do you live closer to oldognewtrick or nealtw?

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Old 02-04-2014, 10:32 AM  
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Not sure, I'm in Boston. I'm on my phone so it does not show me locations. We're expecting at least 12-18" of snow tomorrow. That will be the real test

Where are you guys from?


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Old 02-04-2014, 10:50 AM  
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Oldog Nashville, Neal Vancouver, Villa San Diego, And I’m in Erie the snowiest city in the USA

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Old 02-04-2014, 11:30 AM  
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I think in Boston it's up to you. Paint is also a barrier of sorts but you do want to make sure you have no holes to allow house air into the attic and with the older house holes for wires and plumbing should also be checked not just for moisture but fire stop. The photo is what we do here.
These plastic boxes come in all sizs for light boxes and switch and outlet boxes for the walls. When we build interior wals we put poly between the two top plates, they did,t do that here so the had to add accustic sealer around the edges.

vapor-barrier-ceiling.jpg  
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Old 02-04-2014, 01:32 PM  
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I asked around and I couldnt find anyone who put vapor barrier in the ceiling around here. Does not mean its right, but ill make sure i seal any holes to prevent any condensation.

I'm going nuts trying to make an old house be efficient, my wife thinks im nuts...



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