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Attic insulation. Cost and decision?

Post in 'The Green Room' started by freddypd, Dec 13, 2012.

  1. kingquad

    kingquad Minister of Fire

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    Pennsylvania
    Unless you're talking about dense pack cellulose, that is not true. It's not as bad as fiberglass, but it doesn't act as an air barrier.

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  2. kingquad

    kingquad Minister of Fire

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    Pennsylvania
    There's a lot of good free info about this all over the web. The Finehomebuilding site is a good place to start. I'll also second the recommendation for the Bruce Harley book. I think every home owner should have a copy, even if you're not a DIY'er. Lots of very good info in there. Just make sure you get the second edition.
  3. Tramontana

    Tramontana Member

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    Wheat Ridge, Colorado
    Technically you are correct, cellulose is not an air barrier, but it does slow air movement.

    From the Greenbuildingadvisor;

    Because of the fiber characteristics and high density of blown cellulose insulation (3 to 3.5 pcf compared to mineral wool or fiberglass batts at less than 1 pcf), it is very effective at preventing internal convection and has been recognized as an effective fire-stop by third-party testing and code officials. While it may not meet the strict requirements for an air barrier material (0.02 l/sec-m2 or 0.004 cfm/sf @75Pa), it will significantly enhance the air-resistance of an assembly over other fibrous cavity insulations, maintain its rated R-value by preventing internal convection and dramatically reduce the flammability of a building structure.
  4. johnny1720

    johnny1720 Member

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    The Great North East
    I bought the atticat stuff from home depot, fluffy pink fiberglass blown in stuff. I paid about a grand to get 32 of the bags and a buddy helped me install it. It took two hours. I had a quote for 3k to spray foam my kitchen walls so I didnt even get a quote on the attic. I wished I could step back in time and get another quote on the foam. I could have bought the DIY spray foam kit and done my kitchen for $600 then put fiberglass over it. The atticat stuff is great but the foam is superior in so many ways.
  5. Shane N

    Shane N Feeling the Heat

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    Oct 16, 2012
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    Loc:
    West Central MN
    Why did they quote you for open cell foam? I don't see any reason to use that instead of closed cell.

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