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  1. #1
    Join Date
    May 2012
    Posts
    2

    Default Batting for non-standard width

    I'm trying to insulate the attic in a 100-year-old house. The bays between the joists are 20" wide, but I can't find any rolls of batting at that width.

    My first thought is to buy 23" batting and slice off the extra 3" with a utility knife, but that seems like it might be both messy and time-consuming. I'm looking for 6 1/2" deep fiberglass insulation, the higher R-value the better.

    Any ideas on the best approach are greatly appreciated. For instance, is there any way to get batting custom cut? Thanks in advance

  2. #2
    Join Date
    Mar 2008
    Location
    nova scotia, canada
    Posts
    1,522

    Default Re: Batting for non-standard width

    cutting 23" wide batts are pretty much all you can unless you want to use blown in cellulose or spend 3x more and get spray foam installed
    fire up the saw and make some dust

  3. #3
    Join Date
    Aug 2007
    Posts
    6,480

    Default Re: Batting for non-standard width

    Another option would be to use narrower insulation in the bays and then roll out the wider stuff perpendicular to the joists over the top of everything.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  4. #4
    Join Date
    Jan 2009
    Location
    Needham, MA
    Posts
    559

    Default Re: Batting for non-standard width

    this happens often. what we do is take a regular insulation bat and cut up a whole length into segments of 20" or whatever the width of the rafters are and install them all perpendicular to the rafters. so if you have a rafter bay and the between the rafter measurement is 20" (for example) and it's 12' long, then you cut 9-10 pieces of insulation 20 1/2" long and you'll need about 9-10 pieces to fill each bay.

    make sense?

  5. #5
    Join Date
    May 2012
    Posts
    2

    Default Re: Batting for non-standard width

    Thanks everyone! This is exactly what I was looking for.

    I've never done this before, and could only find basic instructions ("wear gloves") on the web.

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