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Old 01-06-2009, 06:21 PM   #16
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vapour barrier on ceiling of bathroom?


To the original poster I hope you don't mind but I need to ask a question here - due to everything I've read on this issue.

Folks - if he has a shower that now has blue board as the ceiling and we presume it was properly taped and mudded. Then he has tile over top of that on the ceiling - why would he need to try and retro fit a vapor barrier above that?

Retrofitting a vapor barrier is recommended against on most sites I've seen. Let's say he does a really good job of placing plastic between the joists and taping in place to the sides to seal it. Isn't any moisture (which I doubt will migrate thru the set up he has) going to be trapped at the bottom of the plastic and simply soak into the edges of the joists that will still be exposed because of the retro fit.

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Old 01-06-2009, 08:50 PM   #17
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vapour barrier on ceiling of bathroom?


Quote:
Originally Posted by Rivethead View Post
To the original poster I hope you don't mind but I need to ask a question here - due to everything I've read on this issue.

Folks - if he has a shower that now has blue board as the ceiling and we presume it was properly taped and mudded. Then he has tile over top of that on the ceiling - why would he need to try and retro fit a vapor barrier above that?

Retrofitting a vapor barrier is recommended against on most sites I've seen. Let's say he does a really good job of placing plastic between the joists and taping in place to the sides to seal it. Isn't any moisture (which I doubt will migrate thru the set up he has) going to be trapped at the bottom of the plastic and simply soak into the edges of the joists that will still be exposed because of the retro fit.
The vapor barrier would be for Thermal applications...if the poster is in a region of the country that requires "thermal-insulation" vapor barriers.

The poster stated that there was no vapor barrier installed between the attic insulation and the bathroom ceiling. By Code, in colder regions, there needs to be, due to difference in temperature. The attic is a non-heated area (non-conditioned). The Bathroom is heated (conditioned).

When cold air meets warmer air, it creates condensation (Cold Coke Bottle reaction in summer = dripping wet surface glass).

It is the same application on ceiling areas in direct contact with unheated space (in certain colder regions), as it is with insulated walls = Use vapor barriers.

Example Links:

http://www.powerhousetv.com/stellent...di_000433.hcsp

http://www.bge.com/portal/site/bge/m...08424025166a0/

http://homerenovations.about.com/od/...vaporbarri.htm
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Old 01-06-2009, 11:08 PM   #18
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vapour barrier on ceiling of bathroom?


Thanks for the additional information! So much out there that ends up on opposite sides of this issue. Look at this for example. There is also a GSA site that says adding a barrier after the fact is not worth while?

Hope the OP isn't totally confused - I've read reams of information on the topic and no where near done yet - but I sure am.

http://www.naima.org/pages/resources...der/BI451.HTML
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Old 01-07-2009, 07:31 PM   #19
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vapour barrier on ceiling of bathroom?


Guys, didn't read the whole link, but Wilson lives in Ontario as do I. Due to our climate fluctuation vapour barrier is definately code on all exterior walls / ceiling new construction. Not sure if that blue board covers the entire ceiling but due to our extremes in temp -30 to +100 VB is the norm. we are also in one of the most humid ares of the country between 3 Great Lakes.
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Old 01-29-2012, 03:36 PM   #20
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vapour barrier on ceiling of bathroom?


I have a smiluar problem I have an older home with lath and plaster cielings. There is no vapor barrier in the attic under the insulation. Due to a roof leak last year the cieling of the bathroom got wet and started to bow. The leak has been fixed but I want to install new drywall in the bathroom. Should I put a vapor barrier on top of the old cieling before I install the new drywall?
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Old 01-29-2012, 08:08 PM   #21
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vapour barrier on ceiling of bathroom?


If your house has no vapour barrier already... I wouldn't lose sleep over whether or not you should install one during a renovation that only covers 5% of your house.

I don't even want to get into this one because too many people have too many opinions. Also, I have no idea where you are or what's typical for your climate. I know here we use 6mil poly to create an air tight barrier witch COMPLETELY seals the warm living space. You're only doing the bathroom ceiling...

If a vapour barrier is typical in your climate... put one in and seal it the best you can... but considering you don't have one in the rest of the house... I wouldn't worry too much. Mind you, you might have tar paper backed insulation. That was a form of a vapour barrier in the old days.

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