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  1. #1
    Join Date
    Oct 2013

    Default Return AIr floor joist insulation

    My return air is routed through boxed in floor joists. Thee are gaps in the joints that sock in air from the crawl space. What is the best way to insulate. them.

  2. #2
    Join Date
    Jul 2010

    Default Re: Return AIr floor joist insulation

    Narrow gaps could be caulked. Wider gaps (not over 3/8") can be filled with foam or expanding foam. Gaps over 3/8" will require a repair.

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