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  1. #16
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    Re: Insulation INSTALL Question ??

    Just for reference... I'm attaching a few photos so you get an idea of what I have.



    This is the carport area in front of the shop. The shop area is identical, except the joists running front to back are 3' on center vs. 6' on center on this photo.



    The metal panels are hung perpendicular to the joists so they can be screwed in every 3'.

    The insulation would be rolled out in the same direction as the metal panels.

    I like the idea/thought of a thermal blanket covering the entire area to include the joists. That sounds practical. the space below will be climate controlled year round with a mini split unit.

    The insulation I have is not kraft faced, so sounds like just rolling it out across the joists is the way to go. I just need to finish up all electrical work up there first. I have a few lights that were donated by Phil S that I need to get hung. Wires are pulled, just need to install.

    Thanks for all the comments and advice. I hope to wrap this project up this weekend.
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  2. #17
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    Re: Insulation INSTALL Question ??

    Not nearly as cheap as you want, but....
    Google Repurposed Materials (try this: https://www.repurposedmaterialsinc.c...so-insulation/) and search for poly iso sheets. Manage a group buy for a trailer load. Span the joists with the poly Iso and put your rolled insulation on top.

    As alternative, they have pool covers to stretch between your supports and carry your rolled insulation. Or polyethylene sheets.

    And you help keep stuff out of landfills.

    OBTW, standard disclaimer applies.

  3. #18
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    Re: Insulation INSTALL Question ??

    As Gofor pointed out, laying the batt over the joists is actually a fine way to insulate if you keep each roll snug together with no gaps. This is commonly done to increase insulation beyond amounts placed between joists and eliminates the thermal break created by the wood. The orientation you illustrated will require more material, but fundamentally it is a better way to insulate than between joists. Bunched, wrinkled, overly-compressed, and torn insulation doesn't work as well, but your method can be done cleanly.

    The challenge for any insulation is at the corners. You'll loose a surprising amount at joints between walls, ceilings, and roofs, so pay careful attention at those spots to get the maximum amount of thermal resistance.
    Last edited by SteveHall; 12-07-2017 at 12:05 AM.

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  5. #19
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    Re: Insulation INSTALL Question ??

    I'd cut all the insulation in 1" wide strips (15 strips per roll).

    Then line up 34 of these 1" strips between each joist.

    Done. No problem.

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  7. #20
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    Re: Insulation INSTALL Question ??

    Quote Originally Posted by tarheelz View Post
    I'd cut all the insulation in 1" wide strips (15 strips per roll).

    Then line up 34 of these 1" strips between each joist.

    Done. No problem.
    This may be the best suggestion yet. Starting on it tomorrow... Can you come down and help? I'm just about an hour from Durham!

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