Attic Insulation

Submitted By
Mark Clipsham
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1 expert, 2 community
Q:

I was at a "building it right " seminar recently and they said (backed up with a page from the DOE site) that at least the top six inches or so of attic insulation should be cellulose because uncovered fibergalss is easily saturated with cold or hot and that fiberglass performs well at 70 degrees F but loses insulating ability in more extreme temperatures. The cellulose appearantly holds the heat or cold in the fiberglass. The walls are already enclosed so it doesn't matter. Does this sound right?

Mark

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By the way has anyone out there heard of "carbon heating film" and have a source for it in the US or Midwest?

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Energy auditors point their infrared equip at the cabinets in the winter (from the interior) and they will be read as cold, if on the outside wall, similar to a door or window but appearantly not for the same reason. I wonder what they show up as from the exterior? According to the other commentor that area would appear to be cold (extra cold?) also and that would be good because of the double layer of thermal barrier (insulation plus air space).

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Sorry, I've never hear that one.  The most important thing is to make sure you have 19 - 22 inches of insulation, and enough attic ventilation to keep that insulation dry.

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