Basement insulation

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Posted by: from Peterborough
2/25/2017 at 7:26:37 AM

Part of my basement is finished with tyvek wrap a 1 inch gap followed by 2x6, r22 and then a vapour barrier. Is having a 1 inch gap okay? Or should I be putting rigid board In that gap. Anything I am seeing i should be removing the vapor barrier. The rest of the basement is polytarp which I'm am removing with tyvek on the walls. Can I leave the tyvek on the wall and put the rigid board over that before I frame up my walls?



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Date/Time2/25/2017 at 10:15:45 AM

Hi Janet,

It would be best to attach a photo to describe what you are trying to achieve.

In regards to the 1" inch gap between the framing and wall that is needed for air-flow around the perimeter wall.

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Date/Time2/27/2017 at 9:06:29 AM


Tyvek/typar (house rap) is required only if insulation batts will contact the basement wall (replaces tar paper)Your 1" gap is there so walls will get framed straight,and batts won't touch the concrete, nothing to do with air circulation, that's what insulation is there to stop if you think about it, in this case the gap is fine.

The vapor barrier needs to be sealed to the floor above which can be difficult.

These days most people use 2" blue or pink SM glued to the wall 2X4 framing in front and fiberglass batt insulation to meet code and drywall on top (Important!!! no vapor barrier, the SM is the barrier)

Costs more but makes a smell free basement for life.

Remove anything on the wall if you use ridged foam.

Hope this helped

John R. Miller

Superior Handyman

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