Basements, Attics and Crawl Spaces - attic temp vs outside temp

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joey
07-02-07, 05:42 PM
What is acceptable for attic temp vs outside temp?

It was 92-93 yesterday and sunny and my attic was 135 by late afternoon. Wondering if this was acceptable.

airman.1994
07-02-07, 06:15 PM
Sounds about wright to me!
dmo069
07-06-07, 09:28 PM
What is acceptable for attic temp vs outside temp?

It was 92-93 yesterday and sunny and my attic was 135 by late afternoon. Wondering if this was acceptable.

I have been doing research on this myself. I have read that the attic temp. shouldn't be more than 15 degrees hotter than the outside temp.

nap
07-07-07, 07:46 AM
Ideally, you don't want it any hotter than it is outside but reality generally prevent this from happening.

Simply undertstand that the insulation in your inner envelope ceiling/attic floor must insulate the inner envelope of your house (living area) against whatever temp is in your attic. The cooler you can keep it in the summer, the better.

I don;t know what the recommended or allowed differential is but I would want it cooler than 135.
Concretemasonry
07-07-07, 08:45 AM
The way to make sure it is satifactory is to make sure your soffit and roof vents are providing adeqaute ventilation.

Dick