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Old 08-05-2018, 07:54 PM   #1
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Rigid Foam or Polly for basement insulation


I live in a climate where in the winter it gets to -40C one day and 0C the next day. I am insulating my basement and I have heard some people say:

concrete --->rigid foam ----> studs ----> bat insulation between studs---->vapour barrier

Others say

concrete---->polly----> studs ----> bat insulation between studs---->vapour barrier

Any ideas on what should be done?
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Old 08-05-2018, 08:12 PM   #2
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Re: Rigid Foam or Polly for basement insulation


Foam taped and sealed is a vapour barrier and you only want one.
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Old 08-05-2018, 08:28 PM   #3
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Re: Rigid Foam or Polly for basement insulation


Ok good to know, thanks!
What are the pros and cons to each approach, polly vs. rigid foam?
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Old 08-05-2018, 08:47 PM   #4
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Re: Rigid Foam or Polly for basement insulation


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Originally Posted by RTibs View Post
Ok good to know, thanks!
What are the pros and cons to each approach, polly vs. rigid foam?
I don't if there is one. you just don't want warm moist air coming in contact with cold surface.
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Old 08-08-2018, 11:55 AM   #5
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Re: Rigid Foam or Polly for basement insulation


My city actually specifies no vapor barrier in the basement so check with your local codes in case yours is similar.

I did rockwool in my basement because it is impervious to water. I then spray foamed the top plate for fire stopping. My local codes stated that every 10 feet I have a fire block in the horizontal direction so I did at least that much.
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