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Old 08-13-2012, 10:34 AM   #1
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Attic Insulation


I have a similar problem living in So Cal and my house was built about 30 years ago + or - and lately the heat has been unbearable! (110* average last 3 days) I have recently installed 2 gable fans

I have adequate ventilation and there's the standard tract home insulation but it's just not enough.
My upstairs is 10* to 15* hotter then downtairs
Would I benefit from installing fiberglass insulation between the roof rafters?
the attic has a finished floor with insulation between the floor, but it is still crazy hot upstairs

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Old 08-13-2012, 10:57 AM   #2
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Attic Insulation


Heat does rise, so it's only natural for the second floor to be hotter than the first. Insulation at the rafters won't really help much considering the space is ventilated.

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Old 08-13-2012, 04:10 PM   #3
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Attic Insulation


+1

What do you have in terms of insulation up there?

Radiant barrier have some (albeit very little) application value. This might be one of them but as AGW said, you are going to note some temperature difference regardless.
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Old 08-15-2012, 11:42 PM   #4
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Attic Insulation


Hot air does rise. It's doable, but can get dicey; http://www.buildingscience.com/docum...ifornia-attics

Air seal the ceiling plane first.

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Old 08-16-2012, 11:12 AM   #5
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Attic Insulation


So page 18 essentially shows no real gain from insulating the roof plane while leaving the attic space ventilated. You'll spend alot of $$ and time doing the work for negligable gains...
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