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The Water Cooler
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Best home insulation?
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<blockquote data-quote="-Pjackso" data-source="post: 3231615" data-attributes="member: 8119"><p>Matt Risinger did a good video showing open-cell -vs- closed-cell foam.</p><p></p><p>It's worth a watch. </p><p>Note the water-logged open-cell foam insulation at about 4:23~ish.</p><p>[MEDIA=youtube]H6jiGKOSABo[/MEDIA]</p><p></p><p></p><p></p><p>The R-value of insulation (per 1" thick) is:</p><p>Fiberglass loose-fill R-2.5 – R-3.7</p><p>Fiberglass batts R-3.1 – R-4.3</p><p>Cellulose loose-fill R-3.0 - R-3.8</p><p>Open-cell polyurethane spray foam R-3.6</p><p>Closed-cell polyurethane spray foam R-5.5 – R-6.5</p><p></p><p></p><p>Notice, the open-cell foam is pretty much the same insulating R-value (per 1" thickness) compared to fiberglass and cellulose.</p><p>The increased R-value? not so much. Sure, open-cell foam will to better at 'sealing' the air gaps - but is it worth the additional costs?</p><p></p><p>Closed-cell foam is 2x (double) the R-value of fiberglass. Which is very impressive.</p><p>So a fiberglass wall thickness would need to be 2x the thickness of the close-cell foam thickness to get the same R-value.</p><p>Approximately: 3.5" thick closed-cell foam wall = 8" thick fiberglass insulation.</p><p></p><p></p><p></p><p>R-values per here:</p><p><a href="https://en.wikipedia.org/wiki/R-value_(insulation)" target="_blank">https://en.wikipedia.org/wiki/R-value_(insulation)</a></p><p>Go to the table (2/3 the way down), then click on "R-value per inch" to sort.</p></blockquote><p></p>
[QUOTE="-Pjackso, post: 3231615, member: 8119"] Matt Risinger did a good video showing open-cell -vs- closed-cell foam. It's worth a watch. Note the water-logged open-cell foam insulation at about 4:23~ish. [MEDIA=youtube]H6jiGKOSABo[/MEDIA] The R-value of insulation (per 1" thick) is: Fiberglass loose-fill R-2.5 – R-3.7 Fiberglass batts R-3.1 – R-4.3 Cellulose loose-fill R-3.0 - R-3.8 Open-cell polyurethane spray foam R-3.6 Closed-cell polyurethane spray foam R-5.5 – R-6.5 Notice, the open-cell foam is pretty much the same insulating R-value (per 1" thickness) compared to fiberglass and cellulose. The increased R-value? not so much. Sure, open-cell foam will to better at 'sealing' the air gaps - but is it worth the additional costs? Closed-cell foam is 2x (double) the R-value of fiberglass. Which is very impressive. So a fiberglass wall thickness would need to be 2x the thickness of the close-cell foam thickness to get the same R-value. Approximately: 3.5" thick closed-cell foam wall = 8" thick fiberglass insulation. R-values per here: [URL]https://en.wikipedia.org/wiki/R-value_(insulation)[/URL] Go to the table (2/3 the way down), then click on "R-value per inch" to sort. [/QUOTE]
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