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Whether or not I need a vapor barrier

2 years ago

live in the interior of British Columbia Canada where temperature in the winter months can easily be -20 degrees Fahrenheit or worse. Directly against my basement foundation wall, I plan to install 1/2 inch thick Foamular NGX C-200 XPS. Then tight against that, a 2x4 stud wall filled with Rockwool 3 inch thick unfaced Comfortbatt. Do I then need a poly vapor barrier between the studs and drywall? If not standard 4 mil poly, what about a smart vapor retarder like Certainteed Membrain?

What about all this -- is this the way to go?

If not, I very much welcome suggestions!

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Comment (1)

worthy
2 years ago
last modified: 2 years ago
That adds up to R15.6, which would seem to be adequate en toto.

But the building inspector may consider it inadequate due to the minimal R Value of the XPS on the wall.

We sometimes face that in the Toronto GTA.

B.C. Building Codes are free on-line here.
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