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Old 06-26-2010, 01:52 PM   #16
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blown in insulation


Air sealing an attic is seldom done properly and cellulose does help more than fiberglass in this regard (cellulose stops it, fiberglass filters it): http://bct.nrc.umass.edu/index.php/p...-smart-choice/

“Fiberglass is a suspected carcinogen and carries a hazard warning label. Cellulose is much more benign.” http://michaelbluejay.com/electricity/insulation.html

Cellulose is better in a fire, giving you more time to get out: http://www.cellulose.org/userdocs/Te...ectiveness.pdf

A good read: http://www.buildingscience.com/docum...rent-this-time

Be safe, Gary

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Old 06-26-2010, 04:10 PM   #17
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blown in insulation


My personal thoughts on fiberglass insulation:

it is not effective with air gaps between the insulation and the heat source---- http://oikos.com/esb/38/floorinsulation.html

it cannot have air washing against it from the cold side to negate the R-value: http://www.simplesavings.coop/simple...ee%20walls.pdf

it is stated: “Does inset stapling affect the R-value?
Inset stapling leaves a small triangular air space next to the stud and wall covering. Tests
have shown that the combination of the air space and the insulation beneath it provide the
same R-value as the rest of the fiber glass batt.” From-- http://www.insulating-products.com/p...lation_FAQ.pdf
Yet to me that sounds untrue. I reason with this and common sense about the convective loop and compression: http://oikos.com/library/insulating_...lls/index.html

No air gaps, no inset staples, no floor/ceiling gaps, but a perfect, professional installation harder for a DIY’er to achieve or a loss of product’s R-value: http://oikos.com/library/insulating_...lls/index.html

In an attic, fiberglass is a poor choice because it is exposed to outside air for roof venting. Add to that, air escaping from the heated living space below, the ice dams and other problems (mold) resulting from not air sealing, another insulation would be a better choice. Be sure to air seal the attic or you will just be filtering the moving air from below: http://www.rd.com/how-to-seal-attic-...icle18158.html Use extra thickness to counter the wind-washing effect present, even surpassing the cost/quality guidelines: http://www.enersavesystems.com/pdf/E...Insulation.pdf

Be safe, Gary

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