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Old 02-10-2010, 08:17 PM   #1
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What's the difference between blown fiberglass vs. cellulose?


Please describe.
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Old 02-10-2010, 08:37 PM   #2
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What's the difference between blown fiberglass vs. cellulose?


cellulose has better R value per inch, denser overall product, has better resistance to fire, you will not itch during usage, made from recycled paper so its a green product.
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Old 02-10-2010, 08:49 PM   #3
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What's the difference between blown fiberglass vs. cellulose?


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cellulose has better R value per inch, denser overall product, has better resistance to fire, you will not itch during usage, made from recycled paper so its a green product.
Can this be mixed with blown fiberglass?

Do you know if insulation installers also check the ducting registers in the attic to make sure they are sealed, if requested?

Also, it's "ideal" to have the attic temperature/condition just like the outdoors, but how is that possible with a lot of multi-zoned homes these days with equipment in the attic such as a gas furnace and/or uninsulated gas flues (furnace, gas water heater, etc.)?
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Old 02-10-2010, 08:52 PM   #4
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What's the difference between blown fiberglass vs. cellulose?


Some questions you have are out of my league, especially when it comes to hvac in attics. I see no reason why you cannot mix the two together, more is always better when it comes to insulation. As far as installers inspecting ducting for leaks, I guess it wouldn't hurt to ask, but I highly doubt it, sorry.
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Old 02-11-2010, 07:32 AM   #5
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What's the difference between blown fiberglass vs. cellulose?


I had a company blow in some fiberglass a little while ago. They told me it was less dusty to work with than cellulose. They put in the soffit vent extenders as routine. Also, I would get several quotes because I got a wide range. I think some want to try to soak you for as much as they can get.
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Old 02-11-2010, 07:37 AM   #6
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What's the difference between blown fiberglass vs. cellulose?


You could always ask alot of questions when they come and give you your quotes. If they say they will blow around the hvac, add extenders to soffits and what not, just do that yourself. I save about 200 dollars doing it myself, but I have a really small attic, every little bit helps though.
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Old 02-11-2010, 08:01 AM   #7
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What's the difference between blown fiberglass vs. cellulose?


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You could always ask alot of questions when they come and give you your quotes. If they say they will blow around the hvac, add extenders to soffits and what not, just do that yourself. I save about 200 dollars doing it myself, but I have a really small attic, every little bit helps though.
Thanks.
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Old 02-11-2010, 07:42 PM   #8
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What's the difference between blown fiberglass vs. cellulose?


http://michaelbluejay.com/electricity/insulation.html

http://www.cellulose.org/userdocs/Te...ectiveness.pdf

http://www.homeenergy.org/archive/he...92/920510.html

http://www.ornl.gov/sci/roofs+walls/...on/ins_16.html

http://www.fureyco.com/content/image...ng_The_Air.pdf

Be safe, Gary
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Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!
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Old 02-11-2010, 07:58 PM   #9
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What's the difference between blown fiberglass vs. cellulose?


Cellulose seems like a good product, but my question is what happens to this organic product if it gets wet and starts to grow mold. Does all of the cellulose need to be tossed out?
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Old 02-12-2010, 07:04 PM   #10
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What's the difference between blown fiberglass vs. cellulose?


Good point: http://bct.nrc.umass.edu/index.php/p...-smart-choice/

http://www.energyguide.com/library/E...SubjectID=8375

Be safe, Gary
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Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!
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Old 02-12-2010, 07:28 PM   #11
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What's the difference between blown fiberglass vs. cellulose?


An interesting thing that an installer I spoke to said about blown cellulose is that they usually blow the cellulose with some water, so the cellulose is blown a bit wet. I think it's because blown cellulose gets dusty, but of course, water can't be used when it's freezing cold outside during an install.
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Old 02-13-2010, 09:01 AM   #12
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What's the difference between blown fiberglass vs. cellulose?


I thought water was only used in application when the cellulose was sprayed into a wall cavity so it doesn't fall out, when spray on the horizontal surface in the attic it should be blown dry I would think.
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Old 02-13-2010, 10:02 AM   #13
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What's the difference between blown fiberglass vs. cellulose?


As this article already stated said: " Sprayed Cellulose
Blown cellulose is a great option for attics and retrofit applications where the dry fiber can be supported by an attic floor or enclosed wall cavity. But damp-sprayed cellulose provides an effective solution for open wall cavities in new construction."
http://bct.nrc.umass.edu/index.php/p...-smart-choice/ It goes into detail for you, but requires reading....

Be safe, Gary
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Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!
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Old 02-13-2010, 07:03 PM   #14
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What's the difference between blown fiberglass vs. cellulose?


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I thought water was only used in application when the cellulose was sprayed into a wall cavity so it doesn't fall out, when spray on the horizontal surface in the attic it should be blown dry I would think.
Blown cellulose is very dusty. I think that's why they use water. Also, water is used to activate the binding agent in the insulation, whether in wall cavities or on attic floors.
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Old 02-14-2010, 09:01 AM   #15
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What's the difference between blown fiberglass vs. cellulose?


weird that water with installation isn't an option when doing it at home with the machine rented from the big box stores. It is very dusty, will not argue with that.
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