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  1. #1
    Join Date
    Mar 2009
    Westborough, MA

    Default Insulating a garage

    I have a 21' x 21' area garage with 8' of vertical wall until the roof pitches at a 45 degree to the peak. I am looking to insulate it to keep it warm in the winter, and cooler in the summer. Should I be insulating up the pitched roofline and drywalling, or should I add beams across the garage and insulate it from the top down like an interior flat ceiling?

    Also, if I need to add beams to go across the entire 21 feet, will I need lolly columns in the middle to support those beams at about 11.5 feet or will I be ok?

  2. #2
    Join Date
    Aug 2008
    San Diego, CA

    Default Re: Insulating a garage

    If it were my garage, I'd just insulate the walls and go right up the rafters. I like attic space in garages, for storage of things. I wouldn't want to cover it up in mine. Some new houses HAVE to cover up the ceiling before getting a Certificate of Occupancy but I doubt you've got that problem.

    Running ceiling joists and drywall is going to cost you some money. With that much of a span, you'll have to use some substantial material (like 2x10 at least). Expensive. I'd support the joists in the middle with a 4x beam and a couple of posts in the middle of the garage, separating the two sides.

    Good Luck.

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