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Old 07-01-2011, 08:58 AM   #16
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Question about installing XPS insulation in basement


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Originally Posted by ccarlisle View Post
That's good stuff; I'd just like to add that I have yet to see an "air molecule" - and I've 'been around' LOL - so people may get the wrong idea that everyone know what these are...

Rather, it should be understood that 'air' is a mixture of two main gases: oxygen and nitrogen. One molecule of water vapour 'weighs' 18 units, whereas one molecule of nitrogen weighs 28 'units' and one molecule of oxygen weighs 32 'units'.

'Units' are irrelevant for the sake of this discussion...

Water vapour is lighter than air (otherwise clouds would be near our feet versus in the sky). Water vapour management is thus just as important as air management in 'basement insulation' andthe two are quite distinct from "water management"....
This is a difficult subject for people to understand.....the point is that making something air tight is relatively easy. Making a wall water vapour proof is very difficult and usually fails. Failure only shows when mold grows and smells. Whereas, really the process is simple, provided you do not think the solution is merely stapling a few batts between sticks, or fixing a sheet of plastic over a wall.

By the way, while water vapor is lighter than air, it does not always rise, may I mention ground frost that you see from time to time, frozen water vapor that is in contact with the ground. Of course you get it on trucks parked outside overnight and windows etc. Plus of course (where we started) basement walls.(where it can show as condensation or percolate into the fabric of the wall )

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Old 07-01-2011, 09:15 AM   #17
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Question about installing XPS insulation in basement


100% in agreement
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Old 07-02-2011, 10:20 PM   #18
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Question about installing XPS insulation in basement


"The molecules of water vapor are very, very tiny, much smaller than air molecules as such they require careful preparation to avoid any holes of cracks that will let them though to the cold surface. This is why it is best to fit a water vapour proof membrane (plastic sheet) over the polystyrene, the two combine to create a warm water vapor proof surface that is unlikely to attract water vapor from the air."----



everything I ever read on basements says- no poly vapor barrier just to be safe in all areas.......
http://www.buildingscience.com/docum...gs?full_view=1

http://publicecodes.citation.com/ico...001_par003.htm

http://docs.google.com/viewer?a=v&q=...oAYQmvK_bHtRKg

Cc, you’ll like this one: ftp://ftp.cmhc-schl.gc.ca/chic-ccdh/..._Web_sept5.pdf

Gary
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Old 07-03-2011, 05:33 AM   #19
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Question about installing XPS insulation in basement


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Originally Posted by GBR in WA View Post
"The molecules of water vapor are very, very tiny, much smaller than air molecules as such they require careful preparation to avoid any holes of cracks that will let them though to the cold surface. This is why it is best to fit a water vapour proof membrane (plastic sheet) over the polystyrene, the two combine to create a warm water vapor proof surface that is unlikely to attract water vapor from the air."----



everything I ever read on basements says- no poly vapor barrier just to be safe in all areas.......
http://www.buildingscience.com/docum...gs?full_view=1

http://publicecodes.citation.com/ico...001_par003.htm

http://docs.google.com/viewer?a=v&q=...oAYQmvK_bHtRKg

Cc, you’ll like this one: ftp://ftp.cmhc-schl.gc.ca/chic-ccdh/..._Web_sept5.pdf

Gary
Thank you Gary for the above, have read it all before.
What bit do you not understand?
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Old 07-03-2011, 07:08 AM   #20
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Question about installing XPS insulation in basement


Thanks Gary...
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Old 07-04-2011, 03:22 PM   #21
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Question about installing XPS insulation in basement


"What bit do you not understand?"----- the part I high-lighted of your quote about using a poly v.b. in front of concrete in a basement.

Gary

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