In my last post about super-insulated wall assemblies, I referenced a future post about the superiority of Dense-pack Blown-in Cellulose insulation over other insulating products. Well, this is that post. We’ve talked about insulation in the past, but after extensive research and pitches from other insulation fanatics we’d like to put Cellulose in the spotlight as what we consider to be the best insulation product on the market today.
Why is Blown-In Cellulose so awesome in bullet point format:
- Inexpensive – It’s not as cheap as Fiberglass, but it’s much more reasonable than rigid and spray foam options.
- Lowest Embodied Energy – Of all the types of insulation, cellulose takes the least energy to produce. It is recycled newspaper after all and often it is locally sourced and manufactured.
- Fills all gaps – While batts will leave many gaps around electrical wires and boxes and will not always hug the studs, blown-in cellulose fills every available gap when installed properly.
- Air Retarder - Air leaks in your homes walls and roof can cause significant losses in efficiency. Cellulose significantly resists the flow of air through your walls and maintains it’s rated R-value even in heavy gusts. This feature also makes cellulose a great fire retardant compared to batts.
- Maintains R value – We hinted at this in the last point, but cellulose is exceptional at maintaining its advertised R value. Fiberglass wilts in the face of wind and extreme temperature difference between inside and outside.
- High thermal mass – It’s not called dense-pack for no reason. Cellulose adds thermal mass to your walls that has been proven to help a home maintain its temperature (pdf) for days longer than a similar home insulated to the same R-values with fiberglass.
These are the reasons we have come to love cellulose. It’s not just us though. Search around. More and more super-insulated and Passive Houses are switching to cellulose all over the world.
For a more detailed comparison of insulation products, check out this table at cellulose.org. Did we miss anything? Let us know in the comments.
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