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Old 06-19-2010, 10:02 AM   #1
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blown in insulation


can you put in to much blown insulation
My house seems hotter inside since I added about 12" on top of the 6" fiberglass. Yes the soffet vents are clear, and I have ridge vents.

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Old 06-19-2010, 10:47 AM   #2
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blown in insulation


it can stay warmer at night time, if the A/C isn't running. But it won't make it hotter during the day while the sun is out.

What did you use to make sure the insulation doesn't move to the sofits because of wind.

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Old 06-23-2010, 10:25 AM   #3
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blown in insulation


where are you located?? my experience with fiberglass insulation is : it is not even a good air filter , and almost a zero insulator unless it is totally and completely , absolutely sealed !! .. air moves right thru it!! so does heat !!!
I put 12 inches of cellulose on top the Fiberglas that was in the attic , and stopped the air leaks and radiant heat from the attic .. the job paid for itself in 4 months . foam is even better , and the new type is very safe. I had the walls foamed last year , and now have real comfort and a lot less sound coming in. dddon
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Old 06-23-2010, 11:07 AM   #4
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Fiberglass insulation is not suppose to "stop" air. Don't know why you thought or were told it should.

Cellulose is a denser material. And does have the ability to stop air infiltration.
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Old 06-23-2010, 06:02 PM   #5
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right!!! but what builder or insulation installer seals the Fiberglas so the "air"
and therefore the "heat" does not move freely thru it? I removed the "glass" from the walls in several houses , and found that the air had moved thru and left a lot of dirt and lint, etc behind .... to "insulate", the cavity and insulation must be sealed and dry ... never happens with fiberglass!!
this is what happens to fiberglass "R" value if the humidity level reaches 10% : the "R" value approaches ZERO.... in my opinion, I feel that the problem is so bad that it costs people living in the sunbelt about an extra $2000 per year!!! dddon
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Old 06-23-2010, 06:49 PM   #6
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When installed right. Key word, is right. Air from the house doesn't penetrate the vapor barrier.

And the hose is suppose to have its own vapor barrier, and not rely on the insulation.
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Old 06-23-2010, 07:40 PM   #7
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please define "right" ... a vapor barrier does NOT keep the moisture from the outside world away from the insulation , nor does a "thermal blanket" stop it.
maybe I missed something in the thermodynamics i was taught in college ..
heat moves three ways: ... radiation ..conduction .. convection ... fiberglass is only good at reducing conduction and some radiation. (period)
here is a point to ponder: if air movement was NOT important , then windows that were made in 1930 would have been VERY well insulated by just adding a second layer of pane .. and windows of today would have an R value instead of a value equal to 1/R ... (they have insulating value like a hole in the wall)

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Old 06-23-2010, 08:42 PM   #8
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Insulation. Slows heat transfer. Fiberglass insulation slows all three.

Perhaps you want to read how fiberglass insulation actually works. It needs air in it to work.

Glass does have an R value. Since 1/R is the inverse of R.

Wraps and vapor barriers have been used to slow, reduce air infiltration in homes in Canada for a long time. And has been working for them.

Maybe just in your area in doesn't work?

A proper wrap will stop/reduce vapor transfer from fiberglass insulation. When installed right. Right is the seal is not broken. Any rips, tears penetrations sealed before siding is installed.

Perhaps your forgetting the sick house syndrome of the 80's. When homes were sealed to tight. And mechanical ventilation wasn't used.
Those houses had fiberglass insulation, and wraps. They were tightly sealed. Had high humidity problems in the winter.
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Old 06-23-2010, 09:56 PM   #9
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this thread is NOT wrap / barrier /etc.. it IS about where most of the heat loss / heat gain takes place . below the roof , above the ceiling ... any way you want to look at it...the question was why didn't ALL THAT FIBERGLASS improve the comfort level?? the answer is cause it don't insulate if it ain't sealed !!! Fiberglas in the roof areais a waste of money! cause no one "wraps" the area below the roof that i have EVER seen or heard of .. and that is my point ...and you said it ... cellulose stops air movement!!! nuff said ... either you have an open mind and see what is or ...........
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Old 06-23-2010, 10:48 PM   #10
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I have all fiberglass insulation in my house, same as the last house
Both were warm, no problem heating them
In fact my heating bills have gone down in this house with new fiberglass insulation

Quote:
The most commonly used insulation in modern homes is fiberglass
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Old 06-23-2010, 11:14 PM   #11
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Quote:
Originally Posted by dddon View Post
this thread is NOT wrap / barrier /etc.. it IS about where most of the heat loss / heat gain takes place . below the roof , above the ceiling ... any way you want to look at it...the question was why didn't ALL THAT FIBERGLASS improve the comfort level?? the answer is cause it don't insulate if it ain't sealed !!! Fiberglas in the roof areais a waste of money! cause no one "wraps" the area below the roof that i have EVER seen or heard of .. and that is my point ...and you said it ... cellulose stops air movement!!! nuff said ... either you have an open mind and see what is or ...........
Not a question of an open mind.

Your saying fiberglass insulation doesn't work in an attic. When it does, and it does so very well.

I seen the difference in a lot more then one house already. Where they had fiberglass bat insulation laid in over the existing fiberglass to improve R value. How many houses have you had to have cellulose blown in?
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Old 06-24-2010, 10:05 PM   #12
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Blanket on loose fill glass, or cellulose: http://www.homeenergy.org/archive/he...92/920510.html

Be safe, Gary
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Old 06-25-2010, 10:33 PM   #13
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you guys should READ ALL of the last post study of FG vs cellulose ... what I don't understand is why you fellas argue that homes with fiberglass insulation are so good .... I am sure that I could be "comfortable" in a linen tent at 40 below zero .. IF I PUT IN ENUF HEAT. or i could be "comfortable" AT 100 degrees above IF I PUT IN ENUFF COLD AIR.. .. which is my point ... cellulose insulation IS a better insulation IF YOU ARE GOING TO BLOW IT IN AN EXISTING HOME. ... there is NO DATA showing fiberglass is even close to cellulose when it comes to insulating value of blown in material .. and IF YOU CAN FIND IT
PUT IT HERE SO EVERYONE CAN SEE IT.
I found out how the original fiberglass data was obtained : from a SEALED box .... NOT anywhere close to the construction of a home. there is LOTS of real world wind and moisture that contact the insulation . ( or go right through in the case of fiberglass)

I suspect there are some "flat earth / man can never fly / we can never reach the stars AND THIS IS THE WAY I DO / DONE / DID IT " attitude at work .. ...
Well ... I have found myself in awe of the progress in the past 60 years ... I lived them ...I was born in a house that had NO insulation , central heat (a pot belly stove) and three rooms and a "path" ...
I STILL AM LEARNING. are you?? (my lesson with fiberglass was DAMN expensive)
the poor blokes that blow in fiberglass are NEVER gonna get anywhere close to "comfortable" .... (a real shame and a blow to the planet !!!!!! )
.I KNOW do it "right" ...that is ... put on a couple thermal blankets and vapor barriers in a space you can hardly blow stuff into! .... right ...
(you gotta be "bats" to put in FG bats)
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Old 06-25-2010, 11:03 PM   #14
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Because fiberglass properly installed works
Blown in settles, leaving voids
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Old 06-25-2010, 11:21 PM   #15
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There has never been a real world test for fiberglass or cellulose insulation.

Fiberglass does work. Yes, needs to be blown in higher then cellulose. OMG. LOL...

Fewer chemicals are added to fiberglass.

The chemical treatments in cellulose have not been studied for long term effectiveness yet either.

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