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Old 11-11-2009, 08:47 PM   #1
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attic insulation


Hello,

I need to add insulation to my existing attic and have 2 questions:

1. Am I better off blowing it in or putting batt down?
2. If I blow it in is ok to use green fiber which is basically like recycled paper? NOt sure if that stuff is any good.

Thanks

Dom
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Old 11-11-2009, 08:55 PM   #2
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Cellulose is better than fiberglass.

Blowing it in makes it easy to get around any truss diagonals or other supports.

Makes sure you keep the soffit vents free to circulate outside air under/along the roof and can get to any roof vents. You can always get cardboard or foam chutes to keep the insulation from obstructing the air flow. - This applies to either type of insulation (batt or bulk blown-in).

Dick
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Old 11-11-2009, 09:43 PM   #3
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Thanks, I guess green fiber is considered celluose. When I called to get a quote they said they don't install new baffles but instead angle the blow in insulation to keep it from getting into the soffits. Is that possible?
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Old 11-12-2009, 06:33 AM   #4
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it's possible but in the rare case they get it perfect, settling of the insulation over time may block the air flow. So demand it be done correctly and install the baffles. Check with your local building inspector... he may require their use.
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Old 11-12-2009, 06:37 AM   #5
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I agree with Bob, I'd never blow in extra insulation without baffles. It would nigh on to impossible to keep it out of the eaves without baffles. On top of that, out over the top plate, just shy of the soffit vents, is where you really want to get as much insulation as you can.
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Old 11-12-2009, 07:01 AM   #6
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Thanks. I can get R-30 fiberglass batt really cheap right now because it is 30% off at the store. Would I be better off putting that down over the blow in, it would save me a lot of money?
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Old 11-12-2009, 07:06 AM   #7
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as long as you do not used faced insulation. You do not want a double vapor barrier. 30% off? and you get 30% tax credit if you are in the USA up to $1500.
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Old 11-12-2009, 07:26 AM   #8
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Yes, it is unfaced. Lowes has it marked down from $9 to $6 for 31 sq feet. Home depot will even match it and beat by 10%. So if I do it myself I can install 1500 sq feet for $100 after rebates.

Thank you.
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Old 11-12-2009, 09:06 AM   #9
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no not forget to file tax form 5695 for your tax credit. A tax credit is a dollar for dollar savings since it comes off the tax owed or paid, not that taxable income like a tax deduction.
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Old 11-12-2009, 09:18 AM   #10
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Question on installing batt over existing blown in. Do I want to go perpeindicular to the joists or still lay the bad between them? My blow in barely reaches the top of the 2x4 if that, it is only 3-4" deep.
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Old 11-12-2009, 09:31 AM   #11
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then lay them in the bays so you can fill the bay better.
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Old 11-12-2009, 09:38 AM   #12
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Even with the savings, I'd still go with the blow in insulation. It'll fill all of the little gaps and spaces that rolled insulation won't get. You're saving money now, but losing money month after month, year after year with the poorer performance of the fiberglass.

Also, fiberglass loses R-value as the temps get very low, just when you need it to do it's job.

Cellulose has boric acid in it, which will help keep critters, bugs and bats out of the attic.

Just my 2 cents worth.
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Old 11-12-2009, 09:59 AM   #13
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any chance of the cellouse catching fire? I looked at the natural green fiber at home depot, basically because you get the free blower.

Most companies who blow it in for you use fiberglass blow in.
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Old 11-12-2009, 10:01 AM   #14
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I live in Orlando so not too worried about the cold temps, it is the hot temps that we have to deal with
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Old 11-12-2009, 10:13 AM   #15
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I'm not sure, but it seems like I read that they add something to cellulose so it won't burn.

I guess the cold wouldn't be a concern in Orlando, lol. Although, my friend in Bradington thinks it's cold when it gets down to 70.

The cellulose might still be a better choice to keep the summer heat from radiating down into the house. Did you seal your attic yet?
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