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Old 01-27-2014, 06:18 PM   #1
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How would you insulate this room?


This is an at grade basement room in a 1960's home. There was no insulation previously and the drywall was mold free.

I have a 1.25" gap between the concrete and the framing and about a 2ft gap between the wood and the framing on the other side.

Framing is 2x3

I was going to go with 1" rigid board on the concrete + R12 bats and no VB

For the wood, I was going to go with 2" rigid board and no VB.

Am I way off base?

East coast of Canada, BTW.
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Old 01-28-2014, 07:20 AM   #2
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How would you insulate this room?


You are going to need more R-Value in that wall in Canada.

Are you re-framing?

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Old 01-28-2014, 09:57 AM   #3
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How would you insulate this room?


R-13 and a vapor barrier is the legal minimum for basement walls here in the mid south and I would think it is higher in Canada. It is not difficult to fur out exiting wood in your situation to achieve proper depth.
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Old 01-28-2014, 08:01 PM   #4
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How would you insulate this room?


On the wood side, where does the VB go? On the wall with the drywall?
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Old 01-28-2014, 08:06 PM   #5
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How would you insulate this room?


Technically it would go to the warm wall in this case.

I would plan on including more insulation in your application as mentioned above. Based on your climate and the harshness of the cold seasons...it will be a great investment.
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Old 01-28-2014, 08:14 PM   #6
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How would you insulate this room?


So to update:

Concrete: 1" rigid board + 2" rigid between studs + VB. I'm afraid of using fiberglass and that it will rot. No water leaks on the foundation, but I'm just worried.

Wood side: 1" RB on the kneewall + 1.5" RB on the wood + R12 bats on the wood + VB
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Old 01-28-2014, 08:57 PM   #7
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How would you insulate this room?


Quote:
Originally Posted by RCGA View Post
So to update:

Concrete: 1" rigid board + 2" rigid between studs + VB. I'm afraid of using fiberglass and that it will rot. No water leaks on the foundation, but I'm just worried.

Wood side: 1" RB on the kneewall + 1.5" RB on the wood + R12 bats on the wood + VB

To the best of my knowledge fiberglass does not rot and the unfaced stuff does not burn. It will melt in direct flame.

Open cell foam will absorb water. Closed cell will not.
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Old 01-28-2014, 08:58 PM   #8
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How would you insulate this room?


Be sure to include sealing the foam boards at both the wall and stud level.

What type of foam? You may not require a VB with they foam thickness and types.
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Old 01-28-2014, 09:03 PM   #9
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How would you insulate this room?


Well if it was me, since you ask ...
I would consider 4 options:
1. 2" rigid XPS meticulously applied with Roxul batt in-fill
2. 2" rigid XPS with another layer of XPS bonded over top.
3. Spray 2" with Roxul batt in-fill
4. Spray minimum 3"

R-24 is the base code in Canada I believe. That's what I needed to qualify for a federal rebate. I went above that with option #3, and insulated the rim joists to a higher R value yet.

I would be wary of 1" rigid foam on the interior of basement walls in the Canadian climate. While it doesn't insulate well enough to perform as a vapor barrier it does retard drying enough to complicate the assembly. 1" foam with batts means you'd need to install a regular vapor barrier on the warm side, and then you'd wind up with moisture issues in the cavity. Your assembly would have an almost-but-not-quite double vapor barrier. The dew point would fall into the batts. Resulting condensation (moisture) would not have a ready route to dry. A minimum 1.5" of rigid foam will act as a vapor barrier on the cold side, holding the dew point where it can't condense and harm. You wouldn't add the 6 mil vapor barrier on the warm side. If there ever was moisture, the assembly would dry to the inside.

That's the way I understand it anyway.

Last edited by northernlite; 01-30-2014 at 08:29 AM. Reason: R-19 > R-24
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Old 01-30-2014, 08:03 AM   #10
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How would you insulate this room?


I've been doing alot of reading and from what I see there I'd just get someone to come in and spray foam the whole bloody thing, Close cell spray foam from what I'm reading is better than fiberglass. If it were me I'd go with R30+ insulation being a basement and in canada, Then 1/2" Drywall, since you have the walls open if you're wanting any sort of wires such as data or cable tv ect I'd get those run now before you insulate. Deal with Costs ect. I think it would give you a better deal going by way of the Spray Foam instead of the Rigid sheets.
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Old 01-30-2014, 07:47 PM   #11
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How would you insulate this room?


Ontario Building code is R-20 for basements. You can use Pink insulation with 2x6 joists to get R20 and put vapour barrier (VB) on the warmside (6mm poly) tuck tape the joints in the VB and acoustiseal the bottom plate. You can just nail 2x2s on the face of the existing 2x3s to get the depth you need. I would go minimum Roxul batts since it will give you R22 and the VB. Spray foam is good as well and then you do not need VB. I would do spray in my own basement but make sure all your electrical is completed. You should have a gasket under the bottom plate or the bottom plate is pressure treated.

Technically you just have to replace what insulation you have and since you have non then any insulation is OK. You are supposed to get a permit for finishing basements and usually the people are very helpful at the building department. It will cost maybe 100-200 bucks for the permit but you but is covered if you need to make an insurance claim or sell it, etc.

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