Insulation Preference

parkplazaNovember 25, 2007

What is better...The encapsulated in plastic type Lowes sells, or the traditional "paper" faced insulation Home Depot sells. The plastic seems kind of neat, but curious as to others opinions on this. I did feel the plastic was kind of thin. Do they both have the same vapor retarder qualities? It is for a walk out basement on the side that you walk out. On the earthen side, I will use XPS. Also, is it recommended to install a 6mil poly vapor across the entire surface afterwards for insulation improvement?

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There should be no vapour barrier anywhere in the basement, whether in the insulation facing or a separate poly sheeting. It only traps moisture moving inwards.

Here is a link that might be useful: Basement Insulation Systems

    Bookmark   November 26, 2007 at 7:50PM
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But it is a walk out basement..technically above grade. This would mean I should have no vapor barrier in any of my house. Not sure this makes sense.

    Bookmark   November 27, 2007 at 2:32PM
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A tight poly vapour barrier inhibits the drying to the inside of water vapour moving towards the inside in the summer. In other words, it traps moisture in the wall, where it doesn't do anything good for your insulation and framing. Unless you are building in a jurisdiction, like mine, that still requires such a barrier, leave it out.

For full information on this and other topics, go toBuilding Science.

Check out, especially, their "Designs that Work",which are climate specific, such as this one on cold climates.

Building Science is a partner with the US Department of Energy Efficiency and Renewable Energy in its Building America programme.

Here is a link that might be useful: Understanding Vapor Barriers

    Bookmark   November 27, 2007 at 4:55PM
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