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Old 02-09-2012, 11:52 AM   #1
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cellulose question


I have batte insulation in attic now and am having some cellulose added. My issue is that baffles were not installed on the front of my house and I have vaulted celilings. This means my soffit vent is actually 10ft below my attic floor making proper installation of baffles impossible. The insulation guy recommended dense packing the cellulose into the front eaves of my house all the way to the soffit vents. This will obviously defeat the purpose of the vent but I was told it will not be needed since the cellulose will eliminate air flow into the eave. Will the cellulose come out of the actual vent into the gutter???? Does this sound like the right advice? I will be left with a rear soffit, ridge vent and gable vent. Thank you

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Old 02-09-2012, 10:50 PM   #2
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Without pics or being there, it is hard to guess, but I'd ask someone else who does dense packing, too. People spray foam against roofing, as that does air seal real well. Cellulose? I really doubt it. Even dense packed, I don't think it is a good air sealer (fair, but not enough). If it were a great air sealer, then why would people who build super-insulated houses w/ it (I'm talkin' 18" deep) INSIST on impeccable air sealing measures? I think you are setting yourself up for a potential disaster. Are there no other options, including doing some tearing out, etc?

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Old 02-10-2012, 06:58 AM   #3
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Originally Posted by jklingel View Post
Without pics or being there, it is hard to guess, but I'd ask someone else who does dense packing, too. People spray foam against roofing, as that does air seal real well. Cellulose? I really doubt it. Even dense packed, I don't think it is a good air sealer (fair, but not enough). If it were a great air sealer, then why would people who build super-insulated houses w/ it (I'm talkin' 18" deep) INSIST on impeccable air sealing measures? I think you are setting yourself up for a potential disaster. Are there no other options, including doing some tearing out, etc?
My only other option is to leave the slope as it is which is packed with fiberglass batte insulation and try to slide some baffles in about half way. I have not had any moisture issues in the 22 years the house has existed. Then I could just add some insulation to the attic floor. I have read online that dense packing eaves over the soffit is a practice that is used. The only way to fix it 100% correct is too tear down my kitchen and living room ceiling to access from underneath. I do not want to do this!
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Old 02-10-2012, 10:35 AM   #4
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What good would it do to slide a baffle half way down? Is there not an air space between the existing fiberglass and the roof deck?
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Old 02-10-2012, 11:08 AM   #5
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What good would it do to slide a baffle half way down? Is there not an air space between the existing fiberglass and the roof deck?
There really isn't any space between the insulation and the roof and if there is it is very minimal. There is one baffle installed over the soffit but they should have run 3 of them together to reach the attic. I'm sure some air must leak in but not the amount that should. I assume adding a baffle will help a little as whatever air does come through will only have to fight through 2-3 ft of insulation rather than 5-6 ft. There is no easy fix to make it right and I am not dropping the ceiling.
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Old 02-10-2012, 11:26 AM   #6
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How deep are the rafters? Air moves pretty easily through fiberglass...think furnace filter. I understand your concerns though, as this has failed many times before.
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Old 02-10-2012, 11:29 AM   #7
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http://www.buildingscience.com/docum...-dont-be-dense
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Old 02-10-2012, 11:41 AM   #8
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Awesome article that shed a lot of light on my situation! Thanks a Bunch. Without measuring the cavity I would estimate 10-11 inches. With an r30 batte insulation in the cavity (approx. 9 inches). So there has to be some airflow reaching the attic. I think my best bet would be to leave the r30 fiberglass in place and add baffles for whatever minimal help they provide, but hey they are cheap! Then have the cellulose blown just into the attic floor.
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Old 02-10-2012, 11:59 AM   #9
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That's probably what I would do. If you're still concerned about airflow, you can try to rig up a rigid baffle like these so you can force them down to the eaves:
http://www.youtube.com/watch?v=zD_GRipf-CQ

Keep in mind that when you compress fiberglass you cut reduce it's r-value. If you haven't any issues with it after 22 years, you might just want to leave it alone.

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