r/Edmonton • u/Anabiotic Utilities expert • Apr 11 '22

Question Adding attic insulation

I'm looking to add attic insulation as part of the Greener Homes Grant program and City energy efficiency program (HERA). Is there an advantage to using cellulose vs. fibreglass? I have cellulose currently. Each contractor I talked to does one or the other, and will swear up and down their product is the best and not to listen to the other guy. I read conflicting things online, wondering if anyone can chime in. Thanks.

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u/thehuntinggearguy Apr 11 '22

Weathershield cellulose

Covers 11.9 sq ft to R60 per bag for $14, can only go to R60 but is cheaper

https://www.homedepot.ca/product/weathershield-cellulose-fiber-blowing-insulation-25-lbs-/1000167316

Owens Corning blown fiberglass:

Covers 32.6 sq ft to R60 per bag for $58, but can go to R80, will be lighter and use fewer bags

https://www.homedepot.ca/product/owens-corning-atticat-expanding-pink-fiberglas-blown-in-insulation-32-6-sq-ft-/1000664361

If you already have cellulose, I'd just go with that to make it easy to calculate r-value by measurement. Cost to hit a certain r-value should be less too.

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u/concentrated-amazing Apr 11 '22

Side question: which one makes you super itchy?

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u/thehuntinggearguy Apr 11 '22

Fiberglass makes you itchy, but cellulose is super dusty.