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Old 11-03-2009, 11:58 AM   #1
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need expert advice on insulating old work


cellulose or blown in fiberglass? I have about 320 sq. ft. i need blown in between studs. 1 guy uses certainteed SP for $580? Or cellulose for $800? I heard cellulose will mold??? Fiberglass is a proven insulation, need an expert opinion. What kind of fiberglass is the best to use?
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Old 11-04-2009, 04:38 AM   #2
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need expert advice on insulating old work


The kind to use depends on what insulation is now in the walls, type of wall and condition of existing insulation. Cellulose will fill in voids better then the fiberglass.
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Old 11-04-2009, 05:37 AM   #3
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need expert advice on insulating old work


there is NO insulation in the walls now. That is why i need some blown in. I think i am going with the fiberglass.
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Old 11-04-2009, 06:11 AM   #4
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need expert advice on insulating old work


Cellulose insulation is treated with a borate solution to prevent mold and insect infestation. Cellulose also carries a higher "R" value per inch than fiberglass.
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Old 11-04-2009, 06:42 AM   #5
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need expert advice on insulating old work


Each wall cavity I've opened up that has celulose in it shows evidence of settling. Especially if the exterior isn't well sealed (i.e., gaps in the siding). I'm wondering if maybe it takes on moisture and compacts. Some of the cavities were down to 50% of the original.
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