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Old 09-10-2011, 12:27 PM   #1
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injecting spray foam insulation into a 2' cut out section of basement drywall.


Could I put spray foam insulation into the approximate 2' cavity at the bottom of my (recently cut-out due to flooding) basement drywall) when there are already 6' pink batts above? Is it possible to combine the two? If so, would I then need just need to seal the existing, visible vapour barrier and, if so, with what?

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Old 09-10-2011, 09:39 PM   #2
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injecting spray foam insulation into a 2' cut out section of basement drywall.


Welcome to the forum!

You should use rigid foam board on the walls against the concrete wall. Perhaps you are in Canada? The vapor barrier gave it away...http://www.buildingscience.com/docum...gs?full_view=1

If the fiberglass got wet, replace it all; http://www.inspectapedia.com/sickhou...rglassMold.htm

Gary

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Old 09-13-2011, 06:04 PM   #3
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injecting spray foam insulation into a 2' cut out section of basement drywall.


Quote:
Originally Posted by GBR in WA View Post
Welcome to the forum!

You should use rigid foam board on the walls against the concrete wall. Perhaps you are in Canada? The vapor barrier gave it away...http://www.buildingscience.com/docum...gs?full_view=1

If the fiberglass got wet, replace it all; http://www.inspectapedia.com/sickhou...rglassMold.htm

Gary
But why can't I just spray foam into that space and into the gap behind the set back 2x4s ( for the 6" batts)?
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Old 09-14-2011, 10:37 PM   #4
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injecting spray foam insulation into a 2' cut out section of basement drywall.


Go for it. You really shouldn't have a poly vapor barrier in a basement unless in certain areas of Canada or AK. http://libdspace.uwaterloo.ca/bitstr...c%20Thesis.pdf

Gary
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Old 09-15-2011, 09:15 PM   #5
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injecting spray foam insulation into a 2' cut out section of basement drywall.


Thanks for that.......a wealth of highly technical info, too technical for me, i'm afraid.
I am leaving all of this for a month (or longer).
Upon my return I may first get a backflow valve installed and then have the foundation waterproofed-another issue indeed-if weather permits. Or, I may just leave the whole thing until the spring to see if I get any more water into the basement.
Unfortunately, I have to pay to get these things done, I just don't have the knowhow or the tools.
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Old 09-15-2011, 11:07 PM   #6
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injecting spray foam insulation into a 2' cut out section of basement drywall.


I understand, that money thing hits me too....

Gary

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