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  1. Best ways to insulate floor joists include123:
    • Pushing quilt-type insulation into the spaces between the joists from below, supported with netting.
    • Fixing tongue-and-groove wood-fiber board to the undersides of the joists.
    • Using fiberglass batts, mineral wool batts, dense-packed cellulose, or blown-in fiberglass.
    • Alternatively, using open-cell spray foam as an excellent air barrier.
    • Installing pressure-treated plywood between the joists, mineral wool between the joists, and a continuous layer of foam on top of the joists to slow down thermal bridging.
    Learn more:
    The easiest method is to push quilt-type insulation into the spaces between the joists from below. This is supported with netting tacked into place. To provide additional insulation, tongue-and-groove wood-fiber board can be fixed to the undersides of the joists.

    How to insulate a floor and why it's wort…

    www.realhomes.com/advice/an-essential-guide-to-f…
    Most builders insulate joist bays with fiberglass batts, mineral wool batts, dense-packed cellulose, or blown-in fiberglass, although some builders prefer to use open-cell spray foam because it is an excellent air barrier.

    Insulating a Wood-Framed Floor Assemb…

    www.finehomebuilding.com/project-guides/insulati…
    First, he would install pieces of 1/2-inch pressure-treated plywood between the joists. Next, mineral wool between the joists; and finally, a continuous layer of 1 1/2-inch-thick foam on top of the joists to slow down thermal bridging.

    How to Insulate a Raised Floor - GreenBu…

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    The Best Way to Insulate a Floor - GreenBuildingAdvisor

    Jun 2, 2014 · If you want to insulate a floor assembly by leaving the joist bays empty, and installing rigid foam on the underside of the joists, here are a few …

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      Insulating Rim Joists - Fine Homebuilding

      Mar 30, 2021 · One way to insulate the interior side of a rim joist is with spray foam. It’s also possible to use rectangles of rigid foam insulation in this …

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