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Old 09-24-2012, 08:28 AM   #1
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Insulating basement wall


I'm in the process of renovating my basement. I have a block foundation, and I live in Northern Ontario, which means that the winter's get very cold and snowy and that the summers get very hot and humid. I plan in building standard walls and insulating with batt insulation. There seems to be a lot of controversy up here about whether to insulate right to the slab or to leave a gap for some heat to escape to help prevent frost problems. I'm hoping to get some more opinions on that to help with making a decision. Thanks!

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Old 09-24-2012, 09:02 AM   #2
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Insulating basement wall


I would strongly recommend against fiberglass in this application.

Rigid foam is the way to go if you do not have any moisture infiltration issues.

There is zero comparison in the overall wall effectiveness and what the net improvement comparison will be.

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Old 09-24-2012, 12:00 PM   #3
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Insulating basement wall


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Originally Posted by Windows on Wash View Post
I would strongly recommend against fiberglass in this application.

Rigid foam is the way to go if you do not have any moisture infiltration issues.

There is zero comparison in the overall wall effectiveness and what the net improvement comparison will be.
What do you think about Roxul? Code here says that there should be a moisture barrier behind the insulation (tar paper). I'm not sure how I would do this with rigid foam. Also, how would I run my wiring with rigid foam?

Code also apparently says that the insulation must be 15 inches above the finished floor, so I think I'm stuck with that... That being said, it also states that there must be a seal under the insulation at that point. I'm not sure what is considered a seal for that?

Last edited by alexlacelle; 09-24-2012 at 12:01 PM. Reason: question
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Old 09-24-2012, 02:33 PM   #4
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Insulating basement wall


Roxul is better than standard FG in this case.

Foam serves as your moisture and vapor barrier if it is the right type.
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