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Jack13 09-12-2007 11:54 AM

Basement renovation - insulation question
I am in the process of planning my basement renovation. I am located in the Toronto area; I have a poured concrete basement wall, 8 ft in height.

The concrete wall is 6" above the ground (meaning there is 7'-6" under grade). The wall currently has 7'6" of R12 insulation that is fastened to the wall with 6mil poly and a metal banding running horizontally around the room (mid way). This mean that I have 6" at the bottom of the wall that is not insulated or wrapped.

My plan:

I was planning to build 2X4 walls with pt wood as the plate just inside the existing insulation.
1.) Will the uninsulated bottom of the concrete wall (6") cause me any problems?
2.) Should I try and insulate this area?
3.) What about vapor barrier; if I leave bottom 6" bare do I need to put up a vapour barrier on my 2X4 walls?

Thanks in advance for help and advice.

concretemasonry 09-12-2007 12:41 PM

In the real world, the uninsulated bottom 6" of the wall will make no difference in heat loss, especially if the floor at the same temperature is not insulated.

Canada has some "unique" different concepts/requirements (like a "magic" invisable line running around the inside of the basement at grade level) that could have an effect on what would be allowed and what a future owner may look at.

Magus 09-19-2007 01:49 PM

I'm also planning a basement remodel
I'm just a DIY'er, I understand when you say the 6" gap won't make a difference on heat loss but what about cold infiltration from the bare wall?

Finigan 03-01-2008 02:23 PM

Be careful, that 6" gap could be for termite inspection although I don't know if termites are a concern in Toronto?

canadaclub 03-01-2008 07:01 PM

Believe this or not...I was told by a couple of home inspectors that many contractors are leaving 6 to 12" gaps at the bottom of walls in an effort to reduce freezing of the weeping tiles. I don't understand how weepers can freeze that far below the frost line, but thats what I was told. As far as inspections go, either way will pass.

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