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Old 11-30-2010, 08:04 AM   #1
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Insulation?!!!! Fiberglass (pink stuff) or Something Else?


I am not looking for spray or spray foam. My MAIN interest is in batts. 2x4 cavity walls. What alternatives would you suggest to pink fiberglass? What are the cost factors and R values?

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Old 12-01-2010, 04:54 PM   #2
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I'd avoid fiberglass and stick to cotton or cellulose for insulation. They are the safest overall; but they do have a higher up-front cost. My concern about fiberglass is that it will become the next asbestos; this could possibly make the house difficult to sell in the future. Maybe I'm just paranoid.
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Old 12-01-2010, 05:45 PM   #3
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Quote:
Originally Posted by suprvee View Post
I'd avoid fiberglass and stick to cotton or cellulose for insulation. They are the safest overall; but they do have a higher up-front cost. My concern about fiberglass is that it will become the next asbestos; this could possibly make the house difficult to sell in the future. Maybe I'm just paranoid.
Crazy talk.
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Old 12-02-2010, 10:52 PM   #4
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Quote:
Originally Posted by suprvee View Post
I'd avoid fiberglass and stick to cotton or cellulose for insulation. They are the safest overall; but they do have a higher up-front cost. My concern about fiberglass is that it will become the next asbestos; this could possibly make the house difficult to sell in the future. Maybe I'm just paranoid.
No "crazy talk" at all. Actually, it is spot on. FG is a known carcinogen, is really poor insulation (great marketing) and besides that, who in their right mind would want to handle that stuff or be around it when installed? I know; in '80 I put 13" into my walls. Cotton or cellulose (treated w/ borates), or rock wool is real insulation. Research FG and you'll read about its R value dropping when it is cold (when you need it; how ironic), convective loops in it, etc, etc. All that said, be sure to air seal like mad. The Airtight Drywall Approach is recommended unless a true vapor barrier is mandated in your area.
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Old 12-03-2010, 05:49 AM   #5
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What is the cellosose?
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Old 12-03-2010, 01:24 PM   #6
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Originally Posted by Evil Scotsman View Post
What is the cellosose?
Cellulose is shreaded newspaper that has been treated w/ borates. Borates are a fire retardant and an insect/rodent retardant. Google it; you'll learn lots. I has been used as insulation for decades and has many benefits over fiberglass. You can blow it loose, wet (so it sticks to a vertical wall, then dries to a crusty, cake like matter), or get it in batts. Here are a couple of links to read
. http://bct.eco.umass.edu/publication...-smart-choice/

http://www.nuwool.com/Products/ProductsMain.aspx

cmsgreen.com

Check on buildingscience.com, etc, too.
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Old 12-03-2010, 08:56 PM   #7
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You might also want to look into rockwool as it is both water proof and fireproof. I have used a brand called Roxul. They also make a product called Safe and Sound which I have used between floors and between rooms as a sound deadener, and it works great. One of the nice things about this product is it does not have that itchy quality about it.

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Old 12-03-2010, 10:23 PM   #8
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Fix: Roxul was high on my list until I decided to dense pack cellulose. I have never seen it, but it "reads good" on many sites. Too, I don't think it is new. One of the Pink Panther companies told me that they used to make it, but quit for some reason, and I think I recall my dad talking about it when I was a kid. The more I read about fiberglass, and the fact that I hate touching/breathing that crap, the more I wish I would have put cellulose in my walls in '80. It was very new, at least to me, then, so I only used it over some FG in my attic; over a foot of it.
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Old 12-03-2010, 10:32 PM   #9
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I think what put me over the top with Roxul was the demo I saw of it being dunked into a pool and coming out dry ( after a shake). The idea of rotting walls that I have installed does not sit well.
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Old 12-03-2010, 10:47 PM   #10
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The rot doesn't come from the insulation, though. It comes from damp air getting to cool wood; hence air seal like a madman. Also, if the wall is vapor open on both sides, water vapor can (maybe) escape before it raises hell. That is one reason to avoid a true vapor barrier unless you HAVE to have it, and install it w/ extreme care if you need one (to keep any air out in the first place). Too, cellulose will absorb moisture better than any other (as far as I know) insulation, store it, and let it out when the temp goes up again. (To a limited degree, of course.) Batts can be very handy for certain situations, and I understand that the Roxul is cut a tad wide so it can be squeezed in a bit(not affecting r value for stink) or left alone to fit the cavity that the carpenter "did not exactly set at 14.5 inches".
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Old 12-03-2010, 11:15 PM   #11
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I was thinking more of not having to toss the insulation in the event there was any kind of moisture penetration more than anything else. I understand the bigger picture of making sure everything is sealed and vapour barrier done correctly. I have also made sure my basement walls that are below grade do not have a vapour barrier so the wall can breathe.
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Old 12-03-2010, 11:21 PM   #12
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Oh. Roger that. That may be a good point for Roxul, then. I was not thinking of catastrophic failure, but stinks happens. You were a step ahead of me. j
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Old 12-03-2010, 11:24 PM   #13
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only cause I have a sprained ankle right now and I think I tripped in front of you....lol
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