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  1. #1
    Join Date
    Dec 2007
    Location
    Bucks County, Penna
    Posts
    181

    Need fiberglass insulation help

    I need to insulate the ceiling of my unfinished basement, which also contains a pain in the butt crawl space. The space between the beams ranges from 14"-17" (didn't measure every beam space, just here and there). My beams are 8" deep.

    I'm confused that the only insulation I've found by calling around and going to the box home stores is either 16" or 23" wide. Does that mean the insulation itself is that wide, or do those measurements include a few inches for the flaps on the facing? I'm also confused people want to know the size from center of beam to center of beam. Why? The insulation has to fit between the beams and the paper backing will be face up, toward the ceiling. So what's the deal with needing to know center of beam to center of beam?

    Would I be better off buying the 23" wide batts and smashing them in? Otherwise, the 16" (whether the insulation itself is truely 16" wide or less) wouldn't fit my wider spaces. The flaps don't matter as I'm putting it paper side up. I'm sure I could cut them all down to about 17", but that would take a load of time (I need about 1100 sq ft). I've read it's bad to smush insulation in 'thick-wise' because it has to be allowed to expand to it's thickness, but is it also bad to smush the sides in width-wise?

    What do I do? This is all new to me.

  2. #2
    Join Date
    Jan 2012
    Location
    Broomall, PA
    Posts
    389
    Compressing the batts makes them useless. 16 inch insulation is made for framing members 16" on center-this equals a 14 1/2" bay. And the 24" would be used in a 22 1/2" bay. Anything else and you'll have to cut them.
    Insulating sucks, but let me offer you this suggestion--call an insulation contractor. I've discovered the cost to have them insulate just about equals the cost you pay just to buy the insulation at HD or Lowes. You're near me. If you like, I can send you an email tomorrow with a couple of names/phone #s.

  3. #3
    Join Date
    Dec 2007
    Location
    Bucks County, Penna
    Posts
    181
    Sure, thanks. Found your address on your profile, so I'll send you an email.

  4. #4
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    6,815
    Try rock wool insulation batts, its great for soundproofing and fire rating but its itchy as the sun is bright.

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