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  1. #1
    Join Date
    Nov 2007

    Default Insulation attic challenge

    My parents home is an old bungalow. The mostly unfinished attic has 2x4 ceiling joists 24" on center. I put in R-11 years ago, but need to upgrade due to high oil prices. How can I cost-effectively do this? Joists are full -- other options, foam board over insulation but cost is an issue -- cut in holes and blow into floor joists (there is a subfloor of 8-inch boards in place, but there is a staircase coming up to the attic so I would not be able to insulate there) and part of the attic is finished (unsure if I can get insulation under this floor). What is the best way to say double the R-value of what is in place? Thanks for your help.

  2. #2
    Join Date
    Oct 2007
    Louisiana (Cajun Country USA)

    Default Re: Insulation attic challenge

    I'm no expert, but I've often read that you should lay new insulation perpendicular over the existing insulation.

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