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Old 09-28-2006, 10:04 AM   #1
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Is this a double vapour barrier or not?


The inspector asked me to put in plastic sheet on the washroom insulation (on top)... but if I am going to install green board... wouldn't that create a double barrier for the greenboard?

as both behind and on top of greenboard have vapour barrier... water cannot escape...

or I understand "double barrier" incorrectly...?

Please advice...

I may write to city to clarify as I don't trust this new inspector...she is not the last one who visited us...

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Old 09-28-2006, 10:49 AM   #2
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Is this a double vapour barrier or not?


The insulation goes on the "warm in winter" side of the insulation. That is, NOT on top of the insulation over your washroom. From the inside out it will be:Greenboard, plastic, framing, insulation, outside temperature.

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Old 09-28-2006, 10:53 AM   #3
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Is this a double vapour barrier or not?


Thanks for the technical "Bonus", but please I am not a contractor or technical person... could you just tell me if the inspector is right or wrong... I live in Toronto.. for your consideration of the situation...
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Old 09-28-2006, 11:15 AM   #4
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Is this a double vapour barrier or not?


As you've described the situation, the inspector is wrong.
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Old 09-28-2006, 11:17 AM   #5
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Is this a double vapour barrier or not?


Thanks, Bonus, that makes me writing to the city to clarify a good move then...

or just to clarify my situation is like this


outside | concrete | membrane | framing + R12 insulation | ? | greenboard | inside bathroom


should I put plastic in the ? position

the inspector say Yes...

Last edited by KUIPORNG; 09-28-2006 at 04:23 PM.
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Old 09-29-2006, 01:17 AM   #6
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Is this a double vapour barrier or not?


Kui, as you just wrote it the inspector is correct. Sorry if I misunderstood. The vapour barrier should be between the drywall (greenboard) and the insulation. Are we on the same page yet?
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Old 09-29-2006, 09:34 AM   #7
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Is this a double vapour barrier or not?


Kui****g,

I think you are getting confused about MR board.

Moisture Resistant Board (aka green board) installed, is not a vapor barrier in any way, shape or form. It is not rated as one nor is it recognized as one.
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Old 09-29-2006, 09:36 AM   #8
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Is this a double vapour barrier or not?


Thanks, I will do what the inspector said now...
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Old 09-29-2006, 10:09 AM   #9
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Is this a double vapour barrier or not?


Don't forget to smack yourself for implying the inspector didn't know what she was doing because she is a woman! Just Kidding, well not really

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Old 09-29-2006, 10:54 AM   #10
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Is this a double vapour barrier or not?


Tks for the deconfusioning, Atlantic.
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Old 09-29-2006, 11:04 AM   #11
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Is this a double vapour barrier or not?


I have to admit the lady inspector is right, but she indeed is more serious than the male inspector who came before... not an offense... it just that you know... even she is right... she is more picky... she gave comment which is so relative, like " those insulation should be on the surface rather than pushing in in some places...etc. what I tried to say... if you want to pick on somthing, there are plenty of room... there is no perfect workmanship on any project... as I read from code standard, code suppose to offer minimum restriction to the project to ensure it fullfill the mimimum standard of safety...etc... not try to draw a perfect picture... like measure how many mm the insulation being stay below/above the stud surface....... and the attitude is another problem... like someone with a thick glasses and cannot smile coming into your house... this is the impression described by my wife ... and I picture it... this may be depends on the person, rather than male or female.... it happens in this case a female only...
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Old 09-29-2006, 11:13 AM   #12
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Is this a double vapour barrier or not?


With your description I hate her already!

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