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Old 11-14-2010, 09:17 PM   #1
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Insulation & Baffle


I am installing additional insualtion over my cellulose insulation and going to be installing baffles for the the air flow (see link)..
http://www.homedepot.com/webapp/wcs/...0&ddkey=Search

My lower attic is over my family room and garage and insulation is over the family room side only. Do you see a reason why I would need baffles in the portion of the attic that has no insulation. I realize that the point of the baffle is prevent insulation from covering the soffit air flow, but didn't know if having them installed where there is no insulation would be a benefit.

Thanks,

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Old 11-15-2010, 07:10 PM   #2
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Insulation & Baffle


I don't see any benefit from here....... Be sure not to overload the drywall: http://www.energyguide.com/library/E...SubjectID=8375
Before adding more insulation, air seal the attic: http://www.google.com/url?sa=t&sourc...O842EQ&cad=rja

Gary

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Old 11-15-2010, 08:08 PM   #3
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Insulation & Baffle


Thanks. Is it a OK practice to install rolls over the cellulose? I was going to install R-30 Corning Comfort Touch on top of what I have currently.
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Old 11-15-2010, 10:46 PM   #4
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Insulation & Baffle


Fiberglass blow-in insulation at a low density is not good for attics. http://www.homeenergy.org/archive/he...92/920510.html
A heavier take on the same test: http://infrared-energy.com/files/Spe...onProblems.pdf



The low density (weight per cubic foot) is the problem, not the application. You have cellulose which is superior, why not use more?

The O.C.Comfort is a low (light) density batt I would personally not use anywhere: http://www.owenscorning.com/leed/pdf..._fiberglas.pdf It can have convective loops in the attic or the walls.





At H.D., the O.C. comfort touch unfaced batts R-30, sell for 88sq.ft. and weigh 39# total. Check my math here.....

9-1/2" thick / 12 = .792 X 88 = 69.67 cubic feet 39# / 69.67 = 0.56# per cubic foot and what was the insulation density in the test mentioned? lol.......

Gary
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