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Old October 5th, 2014, 09:50 AM   #1
MonkeyBiz
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Default Blow in insulation

Educate me please. Value vs Cost differences.

The GreenFiber stuff: @ 6.81 for 40sq Ft.

Weight per Cubic Foot 10.59
Weight per Cubic Foot (lbs.) 8.77
Package Contents 19.05 lb Blow In Natural Fiber Insulation for all R-Values
Recommended Use Thermal performance, sound control, and fire resistance for attics
Thickness for 22 R-Value (Inches) 7.12
Thickness for 38 R-Value (Inches) 11.97
Thickness for 19 R-Value (Inches) 6.19
Coverage Area @ R-19 (Sq. Feet) 40
Bagged Volume in Cubic Feet 2.171


VS


The Fiberglass stuff @ $35.45 for 103sq Ft.

Weight per Cubic Foot (lbs.) 8.3
Blow-In Insulation Yes
Recommended Use Great for attics
Thickness for 22 R-Value (Inches) 9.9
Thickness for 38 R-Value (Inches) 16.2
Thickness for 19 R-Value (Inches) 8.7
Coverage Area @ R-19 (Sq. Feet) 103
Bagged Volume in Cubic Feet 3.69
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Old October 5th, 2014, 10:17 AM   #2
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Green stuff will settle decreasing r value, but is recycled goodness.
Absorbs moisture like a sponge.

I used a white fiberglass that I blew into my attic. Need 2 people otherwise blown insulation is a pita. Wear a mask and GOGGLES for whatever you use.

Get that punk Jeepfreak to help you.
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Old October 5th, 2014, 11:07 AM   #3
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He won't come over. He doesn't <3 me any more.

So...

Fiberglass: 1
Recycled goodness : 0
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Old October 5th, 2014, 11:20 AM   #4
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Default Blow in insulation

I was just discussing this very concept with my soninlaw yesterday He used to work at Home Depot and swore by fiberglass me not so much but after seeing the real numbers I guess it will be glass in my shop Just finished my ceiling yesterday so insulation will come after a little more wiring


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Old October 5th, 2014, 11:54 AM   #5
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It looks like the fiberglass takes 25% more to get the same r rating ? Would a properly vented attic have a moisture problem ?
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Old October 5th, 2014, 01:48 PM   #6
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It looks like the fiberglass takes 25% more to get the same r rating ? Would a properly vented attic have a moisture problem ?
The recycled stuff supposedly settles. It does seem heavier.
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Old October 5th, 2014, 02:18 PM   #7
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The recycled stuff supposedly settles. It does seem heavier.
From what I've been reading, that is was it's supposed to do, to reduce the amount of air that passes through it. Looks like the biggest down side is that it wicks and hides leaks, which makes it a pain in the ass when there is a problem.

I know for a structure fire, it burns like shit, and makes a helluva mess during overhaul operations.

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Old October 5th, 2014, 09:10 PM   #8
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Old October 6th, 2014, 12:16 PM   #9
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I've not noticed any significant settling issues with cellulose. It does settle a bit after its first installed but I've had it in my house for 5yrs and my parents have had it for over 20 and I haven't noticed any continued settling. I've not noticed any moisture issues.

Fiberglass looses R value as it gets colder out, cellulose does not.
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Old October 6th, 2014, 12:23 PM   #10
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Been wanting to look into this as well, to blow on top of existing fiberglass. Do you need to get the baffles for between the trusses to keep airflow for venting?

Is there any issue putting the green stuff on top of existing glass?
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Old October 6th, 2014, 12:23 PM   #11
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Thanks! I think that's what I will end up using. From what I've read, it a tad higher initial cost, but the long term savings are greater.
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Old October 6th, 2014, 12:24 PM   #12
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Originally Posted by Haggar View Post
Been wanting to look into this as well, to blow on top of existing fiberglass. Do you need to get the baffles for between the trusses to keep airflow for venting?

Is there any issue putting the green stuff on top of existing glass?
I got the chutes from lowes... like 1.98 each.
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Old October 6th, 2014, 12:32 PM   #13
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Yes, you can put cellulose on top of fiberglass. It actually prevents the fiberglass from loosing r-value when the temp drops.

You can buy those baffles or use something else to block the insulation from falling into the soffit when you blow it in. I was told that going around the outside of the house and putting a leaf blower to the soffit vents will clear them out. Haven't tried it myself.
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Old October 6th, 2014, 12:33 PM   #14
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@Haggar here.. Found it. Measure between your trusses. there are 2 different sizes. Took me better part of the day in the middle of the summer. I'm going to add another 5+ inches. There is currently rolled in Fiberglass, and ~2 inches of cellulose on top of it.
http://www.lowes.com/ProductDisplay?...llow&cId=PDIO1


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Old October 6th, 2014, 12:47 PM   #15
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Thinking about paying someone to do it, my back is screwed up and it always gets messed up worse being up there.

We have 10-14 inches of fiberglass already, but with all the improvements to the rest of the house, the ceiling upstairs is still the main loss area.
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Old October 6th, 2014, 12:54 PM   #16
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The cellulose stuff- if you get a small roof leak, it will absorb the water until it gets wet enough for a 3 foot section of your ceiling to fall down.
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Old October 6th, 2014, 01:10 PM   #17
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Quote:
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The cellulose stuff- if you get a small roof leak, it will absorb the water until it gets wet enough for a 3 foot section of your ceiling to fall down.
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Old October 7th, 2014, 07:54 AM   #18
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I installed 20" of cellulose in my other house for $490 including the baffles. That's a 1000 Sq. Ft Ranch. When I put it in I marked every truss at that measurement and ran string across the other side only to make it easier when blowing it in. Last time I was in there a few months back it looks like it has settled about 1.5".

I didn't want to deal with fiberglass at all. There was nothing fun about the job to begin with and I didn't want to deal with the hellish itch I get from the fiberglass.

In the one year I stayed in the house after doing it my winter heating bills were down $80/month and summer cooling. was down by $50/month. Talking to my tenant last spring her bills were in the same range and that was the worst winter ever.

Realistically the shit is cheap enough where adding a couple of inches to compensate for any settling doesn't break the bank. It's a small price to pay to avoid dealing with the glass, at least to me.
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Old October 7th, 2014, 09:22 AM   #19
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Down 80.00 on a 1000 sq Ft ranch?!?!?! That's what gas/heat bill was in February last year! How much was there before you put the 20'' in?
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Old October 7th, 2014, 04:12 PM   #20
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For the cost loose fill cellulose is a very good product. Don't quote me on exact numbers but I believe that you can get around R3.7 per inch of cellulose installed in attics. I install cellulose in every attic of every new project we build. Yes cellulose will settle (approximately 2", when installed 18" deep). We account for that settling when installing. If we want a final R value of 60 in an attic we install 18", which will give you a "settled thickness" of 16" (3.7 *16=R59.2). Anyways cellulose is a very good product and is very widely used in our industry. Most lumber yards will even allow you to use there blower to install it.
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