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KUIPORNG 09-28-2006 09:04 AM

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...

Bonus 09-28-2006 09:49 AM

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.

KUIPORNG 09-28-2006 09:53 AM

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...

Bonus 09-28-2006 10:15 AM

As you've described the situation, the inspector is wrong.

KUIPORNG 09-28-2006 10:17 AM

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...

Bonus 09-29-2006 12:17 AM

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? :no::yes:

AtlanticWBConst. 09-29-2006 08:34 AM


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.

KUIPORNG 09-29-2006 08:36 AM

Thanks, I will do what the inspector said now...

harleysilo 09-29-2006 09:09 AM

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 :eek:


Bonus 09-29-2006 09:54 AM

Tks for the deconfusioning, Atlantic.

KUIPORNG 09-29-2006 10:04 AM

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...

harleysilo 09-29-2006 10:13 AM

With your description I hate her already!

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