Attic Vertical walls:Insulate to great room


Old 12-19-13, 11:59 AM
biketrax's Avatar
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Join Date: Jan 2008
Location: USA
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Attic Vertical walls:Insulate to great room

Area I am talking about is adjacent to our living dinning room. Versus crawl space in uninsulated attic
I have a small vertical area (cross section) across the attic. In which the (Very) older fibreglass is basically falling off and some is just missing. I was considering installing rigid Styrofoam insulation instead of the standard fibreglass. I would be able to install a very thick fibreglass versus the rigid foam.
I would like to hear when one works better than the other, when you have the option and the choice of either one?
thanks for all suggestions
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Old 12-19-13, 02:53 PM
Join Date: Oct 2008
Location: New England
Posts: 9,993
In some jurisdictions they will require you to cover the rigid foam with a fire barrier, ie drywall. Still a lot of detailing to fill every gap.

Fiberglass also needs to be covered to prevent air currents. High density fiberglass or better, Roxul will reduce that problem.

Covering is always desirable as it improves performance and helps to keep the stray rodent out. On the cold side be sure any covering is not a vapor barrier.

Old 12-20-13, 05:40 PM
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Join Date: Mar 2012
Location: USA
Posts: 8,470
I would install Roxul there.

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