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43 posts

Geek
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  Reply # 746550 17-Jan-2013 19:56
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FWIW, it's a myth that compressing insulation decreases its per unit depth R-value. It would do so if, in the act of compression, a gap or air gap is created. Standard insulation will gain (per unit depth) R value up to almost 50% compression. Cornings have a chart of compression values for their products.

If you go to BRANZ website http://www.branz.co.nz/cms_display.php?sn=167&st=1 and view the GUIDELINE for December 2012, you will see a note about insulation over specification, and the problems it can cause - Rediced R-value, difficulty in getting a tight fit to the framing, causing a bulge in the flexible wall underlay into a drained and ventilated cavity, and the popping of screws as the sheet adhesive is not properly compressed.

534 posts

Ultimate Geek
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  Reply # 746564 17-Jan-2013 21:06
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I'm sure it's not a good idea but in the small percentage which gains most benefit ie 20% or less, those issues aren't relevant. The point is that the argument about compression was really about installation eg stuffing batts into a space when they've been incorrectly sized.

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