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Basement Insulation Retrofit in Zone 5
February 13, 2018
6:55 am
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insulationsydneyhiggins@gmail.com
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January 19, 2018
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Hi Mate,

For those who are interested in conducting a basement insulation treatment project for under a £1000, pls visit my website.

http://www.insulationsydney.com.au/

If this is in breach of forum rules, mods pls delete or move.

Thoughts ? Smile

February 29, 2012
9:20 pm
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shawn martin
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December 31, 1969
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Good questions.  Since I'd like to do the work to comply with the 2012 IECC, I'm shooting for R-19 on the basement wall.  I was thinking of using closed-cell polyisocyanurate to provide continuous insulation and avoid thermal bridging at the studs.  It gives R-5 per inch and would keep the block wall warm to avoid condensation.  Plus it has a perm rating that will allow minimal amounts of moisture that come through the wall to dry.  

Inside of that I was thinking of going with a very small air gap, followed by light gage steel framing with fiberglass cavity insulation.  Then paperless drywall to cap it off.

February 23, 2012
11:12 am
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dennis keierleber
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Nice detail. I'm curious about the non-paper-faced rock. Are you trying to get moisture to migrate out of the wall cavity? What about the warm-in-winter side moisture barrier? Is the rigid close cell or open cell? If this is an existing situation how good is the exterior water proofing on the wall? How hard is the ground water in the area? Any sulphates?

February 17, 2012
7:53 am
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james fania
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February 16, 2012
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I would  extend the rim board insulation to be even with the inside verticial plane of the wall insulation, use high density wall insulation, 5/8 drywall. What about leaving a one inch air gap from wall to insulation?

February 16, 2012
3:32 pm
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shawn martin
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Spray foam is wonderful, but very pricey.  Wanted to use foam board to keep the cost lower.

February 16, 2012
2:54 pm
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james fania
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February 16, 2012
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Have you given any thought to spray foaing the walls?

February 16, 2012
9:19 am
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shawn martin
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I realize that insulating block walls in basements in Zone 5 is somewhat controversial and that there are different opinions out there.  I'd be interested in the thoughts of this community on the best approaches to finishing basements that addresses moisture, air sealing, insulation and durability in this climate zone.

The jurisdiction is using the 2009 IECC, but I'd like to try to get to R19 as required by the 2012 IECC.

Any suggestions?  What have you seen that works well or poorly?

(Right now I'm leaning toward the detail described in this article in Fine Homebuilding : http://www.finehomebuilding.co.....ofits.aspx)[Image Can Not Be Found]